Revit MEP 2011 - Official Training Guide 2

871

Mode_Neutral_Zone_Press, Mode_Neutral_Zone_Temp

Mod_Neutral_Zone_Press, Mod_Neutral_Zone_Temp Neutral zone pressure/temperature regulation modules

Applications: various

The Mod_Neutral_Zone_Press and Mod_Neutral_Zone_Temp modules can regulate cooling or heating system pressure and

temperature respectively according to the "neutral zone" regulation mode (also called "dead zone”).

Technical features

1tool >= 2.4.21 -

BIOS - -

Compatibility - -

1tool Moduli std 2.5.7.0

872

with other

modules

Devices all pCO controllers -

Firmware - -

Password no -

Protocols - -

Terminals pGD1 (6 keys) external and

built-in version on pCO3

Italian, English

Operations

Given the configuration and input value read by the parameter to be regulated (pressure or temperature), the power

required from the system that must meet the cooling/heating request is returned.

Figure 1: General module operating layout

An essential configuration parameter is the system operating mode which can be used in heating or cooling.

General cooling operations

The following illustration depicts the function that returns the required power.

Figure 2: Function that returns the required power

(cooling operations)

Three zones can be noted:

1. “Neutral Zone” (that the regulation method is named after) where the requested power does not change. This

zone is set by two essential parameters:

Regulation set point (Setpoint_Reg);


873

Neutral Zone differential (Diff_Reg_NZ);

1. “Increase band”, (set by Diff_Reg_Incr) for regulation values greater than the upper neutral band limit;

2. “Decrease band”, (set by Diff_Reg_Decr) for regulation values less than the lower neutral band limit; Another

parameter (Force_Off_Threshold) is included in this zone to force system shutdown (0% power request) when

pressure/temperature values are lower than this threshold.

Note: the power requested in neutral zone (output kept constant in this zone) depends on the cooling

request, which, in turn, depends on a series of uncontrollable external factors. Another possible graph

is illustrated for a different cooling request.

Figure 3: Function that returns the required system power in output for a different cooling request


The value returned by regulation thus depends on pressure (temperature) and on the cooling requests from system

utilities.

The increase/decrease speed (or slope) in the relevant bands depends on an additional parameter calculated by

Mod_Neutral_Zone_Press/Mod_Neutral_Zone_Temp which is the time maximum power (100%, if increasing) or minimum

power (0%, if decreasing) request is reached.

The following illustration depicts the function that calculates this time.

Figure 4: Maximum (100%) or minimum (0%) power request (output) time calculation


There are six additional parameters:


874

Decrease band: minimum and maximum time (Min_Time_0, Max_Time_0) to reach minimum power (0%) and

differential required to reach minimum power;

Increase band: minimum and maximum time (Min_Time_100, Max_Time_100) to reach maximum power (100%)

and differential required to reach minimum power;

These parameters adjust system reaction speed to an input change, the higher the time and smaller the differentials the

faster the system reacts. In this case, the system will obviously be more unstable.

NOTE: Minimum and maximum power request time can be set. To do this, set minimum and maximum time for

the same band to the same values.

General heating operations

In heating, Mod_Neutral_Zone_Press/Mod_Neutral_Zone_Temp behave the same way as in cooling. Output and maximum

or minimum output time are calculated in reverse. Therefore, only the graphs of these functions are illustrated.

Figure 5: Function that returns the required power

(heating operations)

Figure 6: Function that returns the required system power in output for a different cooling request.



875

Figure 7: Maximum (100%) or minimum (0%) power request (output) time calculation


Operating Modes

There are two modes of operation, the Regulation 0 and Regulation 1, established from the pin Neutral_Zone_Mode.

Regulation 0 (Neutral_Zone_Mode = 0): is the native regulation of the module. Allows to obtain an adjustment

aggressive that intensifies with the increase of time spent in an area (increase or decrease).

Regulation 1 (Neutral_Zone_Mode = 1): allows to have a much more gradual adjustment, without having shots

abrupt change of temperature.

NOTE: At the same temperature increase the Regulation 0 takes less time to reach the maximum power

(1000) or minimum (0). The Regulation 1 instead will take longer time, but will have a constant trend.


876

Manual mode

When output forcing is enabled (En_Force=1) the macroblock simply returns the required value (Force_Power) as output

value (Power_Req) (Force_Power). The other outputs that set the system area (Increase, Decrease, Standby) are set to

zero.

Unit of measure

The module manages pressure (temperature) whether measured in bar or psi (Celsius/Fahrenheit).

See also

Variable visibility

Inputs

Outputs

Masks

1tool standard modules2.5.7.0 - +030220881 Manual - 1tool 2.6.x dated October, 1 2012 © 2007-2012 CAREL


877

Mod_Neutral_Zone_Temp, Mod_Neutral_Zone_Press: inputs

Connection indications

None.

Auto connections on inputs

Pin ID Other module Pin ID

Unit_Meas_Type AutoC_Unit_Meas_Type Various modules - AutoC_Unit_Meas_Type

Block pin list

NOTE: For variables that also appear in the masks, refer to the Masks section.

All input pins are in the G memory.

Variable Description Defaul

t

U.M

.

Limits or values Mem

ory

Typ

e

Visibilit

y

Cooling_Heating_Mode Operating mode 0 - 0:Cooling

1: Heating

G B Pin,

Default

Table

Diff_Reg_Decr Differential that sets the

decrease band

1.0 (*) 0.1...999.9 G A Mask,

Default

table

Diff_Reg_Incr Differential that sets the

increase band

1.0 (*) 0.1...999.9 G A Mask,

Default

table

Diff_Reg_NZ Differential that sets the

neutral zone band

1.0 (*) 0.1...999.9 G A Mask,

Default

table

En_Force Enables forced power

request

0 - 0: Disabled

1: Enabled

G B Pin,

Default

Table

En_Force_Off Forces output power

request to 0

0 - 0: Disabled

1: Enabled

G B Mask,

Default

table

En_Mod_Neutral_Zone Enables the algorithm part

of the module to be run if

masks are enabled (see

also

En_Msk_Mod_Neutral_Zone

)

1 - 0: Disabled

1: Enabled

G B Pin,

Default

Table

En_Msk_Mod_Neutral_Zon

e

Enables mask view 1 - 0: Disabled

1: Enabled

G B Pin,

Default

Table

Force_Off_Threshold Limit over which output

power request is forced to

0

0.1 (*) 0.0...3276.7 G A Mask,

Default

table


878

Force_Power_Req Power request in manual

mode

0 - 0...1000 G A Pin,

Default

Table

Max_Time_0 Maximum time to bring

power request to minimum

120 s 0...999 G A Pin,

Default

Table

Max_Time_100 Maximum time to bring

power request to maximum

120 S 0...999 G A Pin,

Default

Table

Min_Off_Time Minimum off time after

black-out

180 S 0...900 G I Default

table

Min_Time_0 Minimum time to bring

power request to minimum

30 S 0...999 G A Pin,

Default

Table

Min_Time_100 Minimum time to bring

power request to maximum

30 S 0...999 G A Pin,

Default

Table

Neutral_Zone_Mode Operating mode selection 0 - 0: Regulation0

1: Regulation1

G B Pin,

Default

Table

Reg_Probe Probe on whose value

regulation is performed

(**) (*) -999.9...999.9 G A Pin,

Default

Table

Setpoint_Reg Regulation setpoint (**) (*) -999.9...999.9 G A Pin,

Default

Table

Unit_Meas_Type Unit of measure selection 0 - 0: Bar/°C

1: PSI/°F

G B Pin,

Default

Table

(*) The unit of measure is Bar/Psi or °C/°F depending on the module (pressure or temperature) and the

selected unit of measure

(**): A variable or constant must be connected to pin, the default value is useless since the unit of measure

can be varied.

See also

Variable visibility

General operations

Outputs

Masks



879

Mod_Neutral_Zone_Temp, Mod_Neutral_Zone_Press: outputs

Connection indications

None.

Auto connections on outputs

Pin ID Other module Pin ID

UM_Bar

(UM_Cels)

Unit_Meas_CB Various modules - Unit_Meas_CB

UM_Psi

(UM_Fahr)

Unit_Meas_FP Various modules - Unit_Meas_FP

Block pin list

NOTE: For variables that also appear in the masks, refer to the Masks section.

All output pins are in the X memory.

Variable Description U.M. Limits or

values

Memory Type Visibility

Decrease Power decrease phase in

progress

- 0: No

1: Yes

X B Pin, Default

Table

Increase Power increase phase in

progress

- 0: No

1: Yes

X B Pin, Default

Table

Max_Press_PAAAA

(Max_Temp_PAAAA)

Maximum admitted

pressure according to the


(*) -999.9...999.9 X A Default table

Min_Press_PAAAA

(Min_Temp_PAAAA)

Minimum admitted pressure

according to the selected

unit of measure

(*) -999.9...999.9 X A Default table

Max_Press_Diff_PAAAA

(Max_Temp_Diff_PAAAA)

Maximum admitted

pressure differential

according to the selected

unit of measure

(*) -999.9...999.9 X A Default table

Min_Press_Diff_PAAAA

(Min_Temp_Diff_PAAAA)

Minimum admitted pressure

differential according to the


(*) -999.9...999.9 X A Default table

Power_Req Power request % 0...1000 X I Pin, Default

Table

Standby Standby increase phase in

progress

- 0: No

1: Yes

X B Pin, Default

Table

Time_Remain Time remaining until

maximum or minimum

power is reached

S - X I Pin, Default

Table


880

UM_Bar

(UM_Cels)

The selected unit of

measure is Bar (°C)

- 0: No

1: Yes

X B Default table

UM_Psi

(UM_Fahr)

The selected unit of

measure is Psi (°F)

- 0: No

1: Yes

X B Default table

(*) The unit of measure is Bar/Psi or °C/°F depending on the module (pressure or temperature) and the


See also

Variable visibility

General operations

Inputs

Masks



881

Mod_Neutral_Zone_Temp, Mod_Neutral_Zone_Press: masks

THERMOREG loop

Mask Visible Variables Type

m_Config_NZ If thermoregulation is enabled

(En_Thermoreg)

En_Force_Off

Force_Off_Threshold

Var input

Var input

m_Thermoreg_NZ If thermoregulation is enabled

(En_Thermoreg)

Diff_Reg_NZ

Diff_Reg_Incr

Diff_Reg_Decr

Var input

Var input

Var input

DEBUG loop

Mask Visible Variables Type

m_Debug_Neutral_Zone Always Power_Req

Increase

Decrease

Standby

Time_Remain

Var output

Var output

Var output

Var output

Var output

See also

Variable visibility

General operations

Inputs

Outputs

1tool online help - Mask Editor



882

Mod_Neutral_Zone_Temp, Mod_Neutral_Zone_Press: example

NOTE: The module Mod_Neutral_Zone_Press can be used in similar way to the module

Mod_Neutral_Zone_Temp of which we see the example above.

See also

Variable visibility

General operations

Outputs

Masks


Mod_Neutral_Zone_Temp, Mod_Neutral_Zone_Press: release notes

Following are notes on this model versions released by CAREL:

Data Release Standard

Module

Library

Notes

23/11/2012

1.6

x Bugs fixed

The limits of the pins Min_Time_0/100 and Max_Time_0/100 were 0…1000, too

low for some type of applications. For values > 1000 the Power_Req output

crashes.

The problem is resolved doing calculations with Real numbers, throught the

Real_Op block. The New limits are 0…9999.

(Carel_Ref #9966)

NOTE: For simplicity, it was decided to align the version of the 2 blocks, for

this reason the block Mod_Neutral_Zone_Press is passed from the version 1.4 to

the 1.6


883

Temp:

16/10/2012

Press:

19/10/2012

Temp:

1.5

Press:

1.4

x Update

Added new pin Neutral_Zone_Mode, which allows you to decide how to adjust

the neutral zone. Reg0 (Neutral_Zone_Mode = 0) Reg1 and

(Neutral_Zone_Mode = 1)

Documentation

x 1.4/1.3 x Bugs fixed

The pin En_Mod_Neutral_Zone, not properly cleared it outputs Power_Req Time_Remain.

The problem was that when the output (Power_Req) was in 1000, by placing En_Mod_Neutral_Zone to 0 the value of the outputs will go to 0 correctly, but with En_Mod_Neutral_Zone equal to 1, the output of the request passed to 1000. When it has to start from zero and increase its value with the speed set by the timing pin input.

Updated descriptions of the variables in the variable wizard window.

Update

Added the French, German and Spanish languages.

Documentation

Documents

Revit MEP 2011 - Official Training Guide 2