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MicroTenn II controller used on Tenney environmental testing chambers.Keywords:Environmental Chambers.Tenney.Controllers.
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TENNEY ENGINEERING, INC.
How to set your TOD start
1. Select FULL ACCESS.
2. Press TIME OF DAY key until 000000 appears in the lower
display. (If a time of day start was previously entered that
time will be displayed.) The starting time display differs
from real time in that it is a fixed time value.
3. Press the number keys for hours, minutes, seconds of time
desired for automatic start.
4. Press ENTER.
5. Press ENTER again.
6. Press number keys for the desired starting step, usually 1.
7. Press ENTER.
How to enable your TOD start
Note: you must have loaded your program into RAM either from the
keyboard of from the command cartridge.
1. Select FULL ACCESS.
2. Press HOLD.
3. Press RUN.
4. Press 00.
5. Press ENTER.
When the time of day start point is reached, the hold lamp
turns off, and run lamp turns on. Make sure the chamber has
power, and that all circuit breaker are closed.
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TENNEY ENGINEERING, INC.
If a program is running when the start time occurs, that
program will continue to run, and the start time for alternate
program will be ignored.
How To Use Automatic Shut-Down
To automatically shut down the chamber at the end of your
program, do the following:
1. Enter a next step instruction of the same number as
the current step.
2. Enter time value. At the end of the entered time period,
the chamber will automatically shut down. All outputs will turn off.
OUTPUTS TO CONDITIONING EQUIPMENT
Auto Output
Here is how to make your chamber's conditioning equipment
respond to commands from MicroTenn:
1. Press AUTO.
MicroTenn now varies outputs to automatically create desired
conditions in the chamber. The status of these outputs may be
displayed as follows:
2. Press AUTO again.
The upper display identifies the output number. Lower display
shows the on - off state of that output. L indicates on; 0 indicates
off. If the output is time-proportioned (output 3, 7, 12,14, or 15)
lower display shows on - off state and percentage of output, 0 to
100%. See page for logic details.
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TENNEY ENGINEERING, INC.
To review the state of any output, press the number key
of that output; then press ENTER.
MANUAL Output,
In order for manual output to be used, dip switch #2 must
be in the up (closed) position.
Caution: This mode locks on outputs manually and can cause
uncontrolled runaway conditions. It is used for special purposes
only. Pressing the MANUAL OUTPUT key once holds all outputs steady;
they are no longer under automatic control, so be careful.
Here is how to manually change outputs:
1. Press MANUAL OUTPUT again. Channel No. 1 can now be
changed as follows:
2. Enter any number between -100 to -1 (minus 100% to
minus 1%) for cooling. Alternately, enter 0 to 100 for heating.
Cooling output can be set only on chambers using proportioned
cooling (output 07).
3. Press ENTER.
4. Press ENTER again.
5. Channel 2 output may now be set.
6. Enter any number between -100 to - 1 (minus 100% to minus
1%) for dehumidification. Alternately, enter 0 to 100
for humidification.
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TENNEY ENGINEERING, INC.
OPERATING A TEMPERATURE-HUMIDITY
CHAMBER WITH TEMPERATURE ONLY
When operating a temperature-humidity chamber with temperature
only, select -0 (minus zero) for channel 2 (humidity setpoint).
Unless -0 (minus zero) is selected for humidity, the chamber will
not perform at lowest temperatures, and win attempt to simulate
some humidity level.
To operate with humidity, select the appropriate positive
value of humidity desired.
When you are operating without humidity (minus zero mode) a
request for humidity read-out will result in the display showing
-50 (minus fifty). This display is not significant.
THE DIP SWITCH
#1. Start 22.. logic
Automatic restart (down-open) means that after power inter-
ruption the MicroTenn will restart, and the chamber will continue
running its program from the point of interruption.
Cold start (up-closed) means that after power interruption
MicroTenn will be energized but the program will not resume and
the chamber will not be conditioned. Manual restart is then
required.
This switch is factory-set for automatic restart.
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TENNEY ENGINEERING, INC.
#2. Manual Output Enable
This switch allows the manual output (front panel) switch to
be used. Up (closed) enables; down (open) disables.
This switch is factory-set at disabled.
#3. Guaranteed Soak
Guaranteed soak automatically places the programmer on "hold"
when workspace temperature deviates more than a desired degree
from setpoint.
Allowable deviation is keyed into the deviation alarm. Setpoint
is keyed into the programmer in the usual way. The programmer is
then automatically "held" until chamber temperature comes within
deviation tolerance of setpoint.
For example:
Assume that the chamber is at ambient. 100 C is keyed in as
setpoint and 5 C keyed in as deviation alarm. As the chamber heats,
MicroTenn will remain on "hold" until temperature reaches 95 C.
"Hold" will then be released. Assume that the next setpoint is 0C.
As the chamber pulls down, MicroTenn is on "hold" until temperature
reaches +5 C.
In order to select guaranteed soak, throw the switch to be up
(closed) position.
This switch is factory-set to disable guaranteed soak, down (open).
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TENNEY ENGINEERING, INC.
#4. Printer/CRT
This switch selects baud rate for printer or CRT. It is
factory set for printer, up (closed). CRT and printer are
options not found on all chambers.
OPENING THE INSTRUMENT PANEL
The instrument panel in which MicroTenn is mounted is
hinged left and has a snap catch at its right. It is also
held tightly closed by a thumbscrew which is installed at
Tenney.
Should you want to swing open the panel, make certain
all power is off.
COMMAND CARTRIDGE OPERATION KEYS
PROG ID
Program identification.
Allows you to review or flag for deletion programs that are
currently in the command cartridge library.
READ
Read from command cartridge.
Allows you to read a program from the command cartridge into
the MicroTenn II.
WRITE
Write to command cartridge.
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TENNEY ENGINEERING, INC.
Allows you to copy the program currently in the MicroTenn II
into the command cartridge library. Also allows you to delete
a program from the command cartridge library if the program has
been flagged for deletion via the PROG ID key.
REQUIRED CONDITIONS
Before the command cartridge can be addressed by the READ,
WRITE, or PROG ID keys four conditions must exist:
I. The Entry Lockout key must be in the Full Access
position.
2. The Programmer must be in Hold.
3. The Controller must be off.
4. The timed log feature (if option is used) must be
off.
If these conditions are not met, an error message will be
displayed when one of the keys is pressed. See Error Message
List Page.
COMMAND CARTRIDGE INITIALIZATION
This procedure clears the command cartridge library of all
programs. The initialization procedure can be used to completely
erase a command cartridge if its programs are no longer needed
or if the cartridge is not functioning properly due to noise
during a READ or WRITE procedures.
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TENNEY ENGINEERING, INC.
1. ACTION: Press the WRITE key.
SYSTEM RESPONSE: Three minus signs appear in the lower
display.
2. ACTION: Press the zero key on the numeric keypad three
times. Then press the ENTER key.
SYSTEM RESPONSE: The lower display clear momentarily and
then displays three minus signs.
PROG ID KEY PROCEDURES
To Review Identification Numbers
1. ACTION: Press the PROG ID key.
SYSTEM RESPONSE: Both displays clear and all data lamps turn
off. Then the lower display shows the first program identi-
fication number or displays "EPL" for "Empty Program Library".
2. ACTION: Press the ENTER key consecutively to review all
program identification numbers (3 possible).
SYSTEM RESPONSE: The program identification numbers are dis-
played in the order that they were entered.
3. ACTION: Press the decimal (.) key to display the ID number of
the current MicroTenn II program.
SYSTEM RESPONSE: The lower display shows the program identi-
fication number.
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TENNEY ENGINEERING, INC.
To Flag a Program For Deletion
NOTE
Delection of programs from a command cartridge
library is accomplished by using the PROG ID
key to identify the program to be deleted and
then by using the WRITE key to clear the
command cartridge library of the programs that
have been flagged to be deleted.
1. ACTION: Use Steps 1 and 2 from "To Review Identification
Numbers" until the identification number of the program to
be deleted is displayed the lower display.
SYSTEM RESPONSE: The lower display shows a 3-digit number
of a program.
2. ACTION: Press the minus key (-) on the numeric keyboard.
SYSTEM RESPONSE: The identificaticya number flashes, in-
dicating that the program with that number has been
flagged for deletion.
3. ACTION: To select another ID number for deletion, press the
ENTER key consecutively to scroll eie number into the display.
Then press the minus key (-).
SYSTEM RESPONSE: The ID number flashes, indicating that the
program with that number has been flagged for deletion.
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TENNEY ENGINEERING, INC.
NOTE
The deletion flag can be removed from memory by
bringing the flash identification number to the
display and pressing the minus key (-) again.
To Complete Program Deletion
1. ACTION: Press the WRITE key.
SYSTEM RESPONSE: All data lamps are off and the upper display
is clear. The lower display flashes an input prompt which is
three dashes "---".
2. ACTION: Press the ENTER key.
SYSTEM RESPONSE: The lower display is cleared and the program(s)
flagged for deletion are deleted from the command cartridge by
a WRITE operation. When the WRITE is complete, the lower dis-
play shows the input prompt of three minus signs "---".
READ KEY PROCEDURES
The READ key allows you to read one of the 3 possible programs
(with controller settings) from the command cartridge into the
MicroTenn II.
1. ACTION: Press the READ key.
SYSTEM RESPONSE: The upper display clears, all data lamps turn
off, and the lower display shows the input prompt of three
dashes "---".
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TENNEY ENGINEERING, INC.
2. ACTION: Enter the 3-digit identification number of the
program to be read from the command cartridge.
SYSTEM RESPONSE: The identification number flashes.
3. ACTION: Press the ENTER key.
SYSTEM RESPONSE: If the identification number is found in
the command cartridge library, the identified program,
including controller settings, is read from the cartridge.
If the number is not found, an error message is shown.
An error message will be shown if there is not a command
cartridge in the receptacle.
WRITE KEY PROCEDURES
This procedure allows you to store the program and controller
settings currently in the MicroTenn II in the command catridge
library.
1. ACTION: Press the WRITE key.
SYSTEM RESPONSE: The lower display shows the input prompt of
three dashes. The upper display and all data lamps are off.
2. ACTION: Enter a 3-digit profile identification number between
001 and 999.
SYSTEM RESPONSE: The identification number flashes.
3. ACTION: Press the ENTER key.
SYSTEM RESPONSE: The lower display Is cleared. The program and
controller settings are stored in the command cartridge. When
the WRITE procedure is complete, the lower display shows the
input prompt of three dashes and the upper display is clear.
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TENNEY ENGINEERING, INC.
OPERATING REMINDERS
1. Be sure proportional band PB and reset are properly
entered.
2. Verify every program.
3. Each time you press a key, make sure there is a response.
To every key stroke there is a visual response.
4. Press, don't tap the keys.
5. The ENTER key is used to alternate between channel #1 and
#2 for the following:
a. Setpoint
b. Actual conditions
c. Deviation
d. Proportional band
e. Reset
6. If no time is entered in a step, that step time will auto-
matically be one second.
7. When a program starts to run, the first thing displayed is
actual temperature. This display lasts one second.
8. To stop the chamber from running during a program (such as
to open the door) press OFF: press HOLD. To start the chamber
again, press AUTO: press RUN: Press ENTER.
9. When you are programming temperature and humidity, and
want to stop the humidity function: write a step for the same
temperature and -0.0 for humidity, with zero time for the step.
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TENNEY ENGINEERING, INC.
Then, write another step with the new temperature and -0.0 for
humidity, with zero time for the step. Then, write another step
with the new temperature, -0.0 for humidity, and desired time
for the ramp.
10. There are 510 steps available. .-lowever, 51 are assigned
to each identified program. If a program requires only 21 steps,
the balance of 30 steps cannot be "borrowed" and used for the
following program.
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TENNEY ENGINEERING, INC.
MICROTENN MANUAL
PART 2
GENERAL DESCRIPTION
General Information
Tenney's MicroTenn is a microprocessor-based programmable
instrument, designed to control temperature and humidity or
altitude. A programmer with two setpointversus-time profiles
(common time base) determines the process variable setpoints
as they change with time. The program is started by the
operator using the keyboard, or by a time of day clock which
is internal. Each loop has dedicated logic functions which
aid in control. Control loops and programmer functions are
described below.
Physical Description
The basic component is a a panel mount unit. MicroTenn's
panel unit interfaces via switching modules with the Tenney chamber.
Digital displays, enter keys, lamp indicators, and cartridge
on the panel unit provide an operator interface allowing easy entry
of programs from keyboard or from command cartridge. MicroTenn is
optionally equipped to communicate via an RS 232 port on the back of
the unit.
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TENNEY ENGINEERING, INC.
Functional Description
Tenney's MicroTenn programmer is a 51 step, dual profile,
single time base device which allows you to change temperature
(Channel 1) and humidity or altitude (optional Channel 2) as
time progresses. Temperature range is fromIttitOMP4010fict;
Humidity or altitude setpoints are entered within the para-
meter of 0.0 % to 100.0 %. Other enteries in a step are:
events, step time, repeats and next step. The following
describes these five entries:
The Five Entries of Each Step
1. Setpoints may change as time progresses when the pro-
grammer is in the run mode. Setpoints for profiles may be
entered in each step. The setpoint for each profile may be
set manually when the programmer is in the hold mode and
remains at that value until it is manually changed or the
programmer is placed in the run mode.
2. Events may be turned on or off from the keyboard,
either manually, or programmed to transfer as time progresses.
Eight events are supplied as on/off drives for solid state
(SSR) relays. When a program is running selected event
state change at the beginning of a step.
3. Step Time is entered in hours, minutes, and seconds,
but may not exceed 18 hours per step. This parameter dictates
the length of time in which the setpoint profile output will
ramp or hold its value for a give step.
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TENNEY ENGINEERING, INC.
4. Repeats cell MicroTenn to jump back to a previous step
and repeat that step, or a sequence of previous steps, a
specified number of times after that, the next sequential
step is executed. This number cannot exceed 15. Nested
looping is allowed (cycles within cycles may be programmed).
A recycle to a previous program step causes an immediate
change in the setpoint value. The recycle occurs to the end
of the specified step. Events are not updated for the recycle
step.
5. Next Step directs the sequencing of steps as they are
executed by the programmer. The number entered may be any step
numbered 1 through 51.
Run and Hold Modes
The programmer can be operated in either of two modes. Each
is described below:
Run Mode
In run mode, MicroTenn executes the programmed steps as time
progresses, finally holding setpoint and events at the values
programmed in the last step of the program. The run mode may be
activated by the time of day start or by the keyboard.
Any time during the run mode, the hold mode can be entered.
In hold, the setpoint programmer output, time into step and event
status are maintained. The manual setpoint and program mode can
be entered from the hold state. When transferring from the manual mode to
the run mode, setpoint transfer is bumpless. Depending on the
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TENNEY ENGINEERING, INC.
keystroke sequence used, the next programmer output calculation will
be determined using either the time that remained in the step when
the transfer from manual to run occurred, or the entire step time.
Both hold and run modes may be initiated from external inputs.
When external restart is used, the setpoint programmer will begin
running at step 1 of the currently running program. MicroTenn
must be in run mode to accept external start.
Hold Mode
In hold mode, the programmer will stop execution of the
instructions in each step. It will hold the outputs and events
at their current values until the operator manually changes the
values or until the run mode is continued. The five instructions
entered in each step may be changed in hold mode.
When the hold mode is entered from the external hold con-
tact, the program will stop but the instructions in each step
cannot be changed.
The Command Cartridge
Programs may be stored in for reuse. Command cartridge
capacity is three 51-step programs per side.
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TENNEY ENGINEERING, INC.
Controller
MicroTenn's controller offers precise temperature measure-
ment and control in the range of -100 to 200C. A 100 ohm
platinum RTD sensor measures chamber temperature, providing
for the temperature loop.
An optional second loop is used to measure and control
either relative humidity or altitude from 0 to 100. A dif-
ferential thermocouple measures dry-wet bulb depression for
relative humidity measurement. A 0 to 5 volt input from a
transducer is used for altitude measurement.
Proportional band and reset for each of the control loops
is operator-settable.
Temperature channel (#1) is monitored by deviation from
setpoint and hi-lo limit alarms which are operator-settable.
If a deviation occurs, a contact closes. This contact is used
for special requirements only.
If a limit alarm occurs, the chamber conditioning system
is deenergized and a buzzer sounds.
The limit alarm system actuates via a mechanical relay
associated with the Watch Dog Timer, whic'a also monitors the
operating system in MicroTenn.
Proportional band, reset, deviation, and limit alarms can
be stored as part of each program stored in the command cartridge.
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TENNEY ENGINEERING, INC.
Battery Backup
The battery backup protects the on board RAM, including the
user's current program, for five years.
KEY DESCRIPTIONS
HOLD KEY selects the programmer's operating state where
setpoints and event outputs remain constant and do not advance
with time. A program will not run when the Hold lamp is on;
and the data in any segment may be changed. (Refer to the
MANUAL SETPOINT and PROGRAM keys.)
When this key is pressed, the programmer is placed in hold
state. The red lamp above the hold key lights.
RUN KEY selects the operating state where the programmer
sends setpoint instructions to the controller, as well as in-
structions to the timed event switches. The run mode may be
accessed by 1) setting the time of day start 2) pressing the
RUN key and indicating a starting segment: 3) pressing an ex-
ternal restart switch. When the external restart switch is
pressed, even though a program is currently running, the pro-
grammer will restart at step 1.
When the RUN key is pressed, the lamp above the RUN key
flashes, and the hold lamp is lit. The lower display flashes
the current step. A new step may be selected. When the
ENTER key is pressed, the lower display flashes channel 1
actual temperature once, then displays channel 1 setpoint.
The run lamp is lit; the programmer lamp flashes, and the
hold lamp is off. The upper display shows the current step.
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TENNEY ENGINEERING, INC.
If the scroll arrow is pressed, data for event states,
step time elapsed, repeats elasped (in the current step),
next step instruction, and program time (total elapsed) are
displayed.
MANUAL SETPOINT KEY selects the operating state where
setpoint or event states may be changed manually. This key
functions only if the programmer is in hold mode. When this
key is pressed, the red lamp flashes above the MANUAL SETPOINT
key and the setpoint lamp is lit. The lamp above the PROGRAMMER
key is also lit. The display shows current channel 1 set-
point data. Further directions for using, the manual mode
are in the procedures.
PROG KEY selects the operating state where the program
instructions for each step may be entered into the MicroTenn
memory. This key is functional only if the programmer is in
hold mode. When this key is pressed, the red lamp above it
flashes. The lamp above the PROGRAMMER key is aso lit.
NOTE: The HOLD key must be pressed before the PROG
key is functional.
STEP ADVANCE KEY may be used to advance from one step to
the next step when a program is being entered or verified. The
PROGRAM key lamp is on.
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TENNEY ENGINEERING, INC.
TIME OF DAY displays the current time of day and allows
you to enter the time of day into the MicroTenn memory and set
a twenty-four clock. When this key is pressed a second time,
an instruction to start a program automatically by the time of
day may be entered.
OFF KEY places the controller in the off state and turns
all outputs off. The lamps above MANUAL OUTPUT and AUTO turns off.
MANUAL OUTPUT KEY, is enabled only when dip switch #2 is in
the UP (Closed) position when pressed once, places the controller
in the manual state (open loop). All variable outputs are held
steady and are no longer under automatic control. The manual
lamp is lit. When this key is pressed again time, the
manual lamp flashes and the controller lamp is on. The lower
display shows channel 1 output. At this time, percent output
may be changed: -1 to -100 for cooling and 0 to 100 for
heating. Pressing ENTER allows similar manipulation for channel
2 from 0 to 100%.
AUTO KEY, when pressed once, places the controller in the
automatic mode (closed loop). The outputs change to keep the
precess variable (temperature, humidity) value equal to setpoint.
The red lamp above the key turns on.
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TENNEY ENGINEERING, INC.
When the AUTO key is pressed a second time, the auto
lamp flashes and the controller lamp is on. Data for 16
outputs from MicroTenn may be reviewed in this mode.
PROGRAMMER/CONTROLLER KEY offers two positions. Each
time it is pressed, it alternately selects either "programmer"
or "controller." When programmer is selected, the upper
light blinks. When controller is selected, the lower light
blinks.
Controller mode arranges circuits so that press of scroll
arrow key allows you to review actual, deviation, proportional
band, reset, deviation set, alarm, and limit alarm settings.
Programmer mode arranges circuits so that pressing of
the scroll arrow key allows you to review setpoint, events,
step time, repeats, next step, and program time.
NOTE: Pressing of the ENTER key alternately toggles the
display between channel #1 (temp.) and channel #2 (Humid).
This applies to setpoint, actual, deviation, and proportional.
SCROLL KEY moves the MicroTenn pointer lights from left
to right: along the data line. This key, an arrow, is used to
review or change the segment data (PROGRAA key) or review pro-
cess control data (PROGRAMMER/CONTROLLER Key).
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TENNEY ENGINEERING, INC.
LOAD TOP DISPLAY KEY, when pressed, moves dynamic (changing)
data in the lower display to the upper display for reference.
KEYSWITCH has three positions, allowing you to select a
specific operating state for the entire unit. The Full Access
position :Ls self-explanatory. The operate position allows all
access except program (into memory) and changing of any outputs.
Lockout position is used when MicroTenn is interfaced with a
host computer or when no operator input is desired.
CLEAR SWITCH clears the display, much the same as on a hand
calculator. Clears E messages.
ENTER KEY enters new values for various parameters. Al-
ternates between channel 1 and channel 2. (See note under
PROGRAMMER/CONTROLLER Key.) Enters instructions.
ON/OFF KEY alternates event status from on to off and vice versa.
PRINT KEY actuates optional external print routines.
NUMERIC KEYS enter values for all pa7ameters.
PROG ID KEY allows you to identify programs that are
currently in the cartridge library.
READ KEY allows you to read a profile program from the
command cartridge into MicroTenn or send a new copy of the
operating system to MicroTenn.
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TENNEY ENGINEERING, INC.
WRITE KEY allows you to transfer a profile program
from MicroTenn's memory to the cartridge.
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TENNEY ENGINEERING, INC.
ERROR MESSAGES
SYSTEM STARTUP MESSAGES
Code Meaning
E0-01 Cold Start init'l selected and executed
E0-02 Cold Start init'l executed due to standby power failure
E0-04 Cold Start init'l due to auto-restart abort
EO-10 Auto Restart init'l selected and executed
EO-20 Auto Restart init'l w/no profile idle found
OPERATING SYSTEM ERROR MESSAGES
Command cartridge Displays:
Code Meaning
E4-01 Required conditions for command cartridge displays are
missing.
E4-02 Identification number is not found in command cartridge
library.
E4-04 Identification number entered is currently in use.
R4-08 The indentification number library is full.
Programmers:
Code Meaning
E5-01 Illegal segment number encountered.
E5-02 Illegal next point number encountered.
E5-04 Illegal re-cycle next point number found.
E5-08 Illegal set point value found ($0000)
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