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Digital Motor Protection Relay
DSP – AOL / AOM.
AOM
AOL
Contents
1. Abstraction.
2. Main Features.
3. Functions.
4. Technical Specifications.
5. Pre-set Description.
6. Mode Rotation Order.
7. Input – Output Terminals.
8. Control Key Operation.
9. Trip Indication.
10. T – I Characteristics.
11. Rotation Indication.
12. Trip Timing Diagrams.
13. Application Diagrams.
14. Dimensions.
Digital Motor Protection Relay.
DSP – AOL / AOM
1. Abstraction.
AOL Panel Mounting Type AOM Panel Flush Mounting Type
Installation Model Protection Description
Panel Mounting
Type DSP – AOL
Over Current
Under Current
Phase loss
Reverse Phase
Locked Rotor
Current unbalance
Ground Fault
Password, Self – Diagnostics,
Alarm Panel Flush Mount-
ing Type DSP - AOM
2. Main Features.
· Password protection.
· MCU based digital control.
· Compact size.
· Multi-function.
o Protection: Over current, Under current, Phase loss, Phase Reverse,
Locked rotor, Current unbalance, Ground fault.
o Indication: Current L1 L2 L3, Earth current, Load factor %.
· Wide current range protection.
o Type 10 : 0.5A – 10A, external CT : 0.5A – 6A.
o Type 70 : 5A – 70A.
o Extended current range with external CT : 1A – 1200A.
· Show trip cause and operation information 5 digit display.
· Information updated every 3 seconds.
· Various rated ZCT’s to sense zero phase current for GF protection
o Standard type: External ZCT.
· High sensitivity and wide range for ground fault protection: 50mA – 2a / Zero –
phase sequence current.
· ZCT alarm when not connected: Alarm activated when control power ap-
plied and ZCT is disconnected, flickering “Ec-ct” when “Ec” mode not set to
“off”.
· Various ways to reset after a trip: Manual, Electrical, Automatic.
· Stable operation under frequency variation: 30Hz – 300Hz.
· Self – diagnostic test.
· Over current alarm before tripping.
· Last 8 trip history.
· Connection cable with line noise filter between display meter and converter:
Panel flush mounting type.
Type External ZCT
DSP – AOL - V, DSP – AOM - V 200mA / 100mV
DSP – AOL –A, DSP – AOM – A 200mA / 1.5mA
3. Function.
Protection Operating time Description
Over current · d – time
o 1 – 300 sec / def.
· o – time
o Definite / 1 – 60 sec.
o Inverse / 0.2 – 30
class.
Over current protection for each phase
L1, L2, L3.
Under current · U – time
o dt + 0.5 – 30 sec /
def.
Under current protection for each
phase L1,L2,L3.
Current
unbalance
8 sec. · Adjustable : 30% - 90%
· Rate % = ((max-min)/max) * 100
Phase loss 1 – 5 sec / def. Phase loss protection for each phase L1,
L2, L3 based on load current.
Phase reverse Within 0.5 sec. Phase reverse protection based on load
current.
Locked rotor dt + 0.1 sec. Locked rotor protection while starting.
Ground fault Edt: 1 – 25 sec.
Eot: 1 – 30 sec / def.
Ground fault protection, zero phase
current sensed through ZCT.
Indication Description
Indication dur-
ing operation.
· Indication every 3 sec: L1 current > L2 current > L3 current > Earth
current > Load factor %.
· Press “CLR” to halt / resume rotation.
Check pre-set
value of each
mode during
operation.
· Check a value and a mode by pressing “SET” key once during oper-
ation.
o Pre-set value and mode appear alternatively.
· Check next mode by pressing “CLR” key once.
· Return to operating mode by pressing both “SET” and “CLR” at the
same time or time out after 15 sec.
Alarm · Alarm before tripping when actual current is greater than per-set
alarm value “OC” for 3 sec.
· “AL” & pre-set value % alternating for phase over current.
Function Description
Load current range Type 10 0.5A – 10A or external CT (0.5A – 6A)
Load current range Type 70 5A – 70A
Load current range With external CT 1A – 1200A
Ground fault current Zero phase current · 50mA – 2A
· Sensing through external ZCT
o V Type : 200mA / 100mV
o A Type : 200mA / 1.5mA
Pre-set time Stating delay time (dt) 1 – 300 sec / def.
Over current trip delay time (ot) · 1 – 60 sec / def.
· 0.2 – 30 Class / Inverse.
Under current trip delay time (ut) dt+0.5 – 30 sec / def.
Ground fault starting delay time (Edt) · OFF
· 1 – 25 sec / def.
Ground fault trip delay time (Eot) 1 – 30 sec / def.
Phase loss trip delay time (PLc) 1 – 5 sec / def.
Allowable tolerance Current C<=2A: 0.2A, C>2:+-5%
Time T<=2 sec: +- 0.2 sec, t>2 sec: +-10%
Control power 85VAC – 260VAC, 50 / 60 Hz.
(90VDC – 370VDC)
24VDC +-10%
Trip output relay Main 95 – 96 – 98 1CO (1 – SPDT) 3A Resistive
Aux 05 – 06 – 08 1CO (1 – SPDT) 3A Resistive alarm one of Ec, Ec-td,
AL, uc or Shoc.
Environment Temperature Operation: -25oC to +70oC
Temperature Storage: -40oC to +80oC
Humidity 30 – 85% non-condensing
Current tolerance to frequency variation Average +-5% 30Hz to 300Hz.
Maximum conductor size (without external CT) 25 mm sq.
Screw torque Maximum 0.6 Nm.
Insulation Resistance / IEC-60255-5 100 Meg Ohm or more / 500VDC circuit – case.
High voltage withstand test / IEC-60255-5 · Circuit – case: 2KVAC, 60Hz, 1 minute.
· Contact – contact: 2KVAC, 60Hz, 1 minute.
Lightning impulse voltage withstand test / IEC-60255-5 · Circuit – ground, circuit – circuit: 1.2/50uS,
5KV.
· Control circuits: 1.2/50uS, 5KV.
1MHz Burst immunity test / IEC-61000-4-18 2.5KV, Positive / Negative under 2sec.
Electrostatic discharge / IEC-61000-4-2 · Air: Level 3, 8KV.
· Contact: Level 3, 6KV.
Radiated electromagnetic field disturbance / IEC-61000-4-5 Level 3, 10V/m.
Electric fast transient burst / IEC-61000-4-4 Power, Relay output: Level 4, 4KV.
Surge immunity test / IEC-61000-4-5 Relay output: 1.2x50uS, 2KV (0o, 90o, 180o, 270o).
Conducted disturbance test / IEC-61000-4-6 10V, Level 3.
Power consumption 4W maximum.
4. Technical Specifications.
5. Pre-set Description.
6.
Mode Function /
Range
Description Factory Setting
p**** Password. · Enter 4 digit code “****” to enter setting mode.
o Move cursor from first digit to last using the “CLR”
key.
o Change password in “PEdIt” mode in CAB mode
group.
0000
Out / a / b Define the func-
tion of main trip
output relay.
· Trip output: 1c (95 – 96 – 98).
· a Fail Safe.
o Output relay state is changed when control pow-
er is on (95-96 Open) (95 – 98 Closed).
· b Non-Fail Safe.
o Output relay (95 – 96 Closed) (95 - 98 Open).
· This function cannot be changed during motor operation.
b
ct / setting
value
Pre-set ratio for
external CT.
· This mode available for type 10.
· Pre-set CT ratio (primary value / 5).
· CT ratio: 1 – 240.
· 2t: 2 turns through CT.
· 4t: 4 turns through CT.
· 1: Sense current through own CT or external CT ratio 5/5.
1
oc /Setting
value
Pre-set range for
over current.
· Current range for over current protection.
o Type 10: 0.5A – 10A or for external CT / 0.5A – 6A.
o Type 70: 5A – 70A
Type 10 / 10A.
Type 70 / 70A.
dt / OFF /
Setting
value
Pre-set starting
delay time.
· Trip delay time to prevent unwanted trips during starting.
o 1 – 300 sec.
o Sensing current over 0.2A otherwise dt not used.
5 sec.
Otc / deF /
Inv
Select time cur-
rent characteris-
tics for over cur-
rent protection.
· T – I characteristics: deF / Inv.
o deF (definite): Trip based on pre-set value of “OC” and
“ot”.
o Inv (inverse):
§ dt = 0: trip based on cold curve
§ dt > 0: trip based on hot curve after dt pre-set
(dt + inverse curve time).
§ Multiple value in type 70: 1 – (210/”OC” pre-set
value).
deF
Ot / Setting
value
Pre-set trip delay
time.
· Trip delay time when “OC” current exceeded.
o Definite: 1sec – 60sec.
o Inverse: 0.2 – 30 Class.
5 sec.
Lc / oFF / on Locked rotor. · oFF: disable lock rotor (def)
· on:
o trip in 0.1 sec after dt (“Otc”=def) if starting current ex-
ceeds 300% of oc pre-set value during dt.
o Over current cold curve (“Otc”=Inv).
oFF
PLc / oFF /
setting value
Phase loss by load
current.
· oFF: disable phase loss.
· 1 – 5 sec adjustable: trip on phase loss based on load current.
oFF
RPc / oFF /
setting value
Reverse phase by
load current.
· oFF: disable reverse phase.
· on: trip on reverse phase based on load current within 0.5 sec.
oFF
Ec / oFF / set-
ting value
Pre-set zero phase
current.
· Ground fault protection.
o oFF: disable.
o Sensitive range: 50mA – 2A.
o ZCT.
§ AOL / M – V type: 200mA / 100mV.
§ AOL / M – A type: 200mA / 1.5mA.
o ZCT disconnected alarm when motor stop state: “Ec-ct”
flashing.
oFF
Edt / oFF /
setting value
Starting trip delay
time.
· Definite T – I.
· Pre-set range; 1 – 25 sec.
· Alternate “Edt” & “- -“ when “Ec” mode disabled.
“- -“
Eot / setting
value
GF protection trip
delay time.
· 1 – 30 sec / def.
· Alternate “Eot” & “- -“ when “Ec” mode disabled.
“- -“
uc / oFF / set-
ting value
Under current pre-
set range.
· Pre-set range: 0.6A - <”OC” pre-set value.
· When “OC”<0.7A “UC” is not available.
2 sec.
ut / setting
value
Under current
delay time.
· Pre-set time after dt time.
· 0.5 – 30 sec.
2 sec.
ub /oFF/ set-
ting value
Define current
unbalance.
· Current unbalance phase to phase.
o %Unbalance=((max-min)/max)*100
· Pre-set range: 30% - 90%.
50%
Au-o / oFF /
Ec / AL / uc /
Ec-tb
Define function of
AUX trip relay.
· oFF: same output as main trip.
· AL / Uc trip output is independent to main trip
and selected factor is not available for main trip.
· Auto reset when trip cause is clear.
· Ec: only for ground fault protection.
· Uc: only for under current protection.
· AL: Alarm only for oc before trip.
· Ec-tb: only for ground fault protection, not reset
when trip cause is clear, trips with main trip.
oFF
AL / setting
value
Pre-set alarm lev-
el (%) of “OC”.
· When “AL” not selected in “Auo” mode then “AL
- - “ is displayed.
· Pre-set range 65% - 100% of “OC”
· Alarm trip for pre-set alarm % for 3 sec or more
“AL” & pre-set value %” alternate flashing in
phase rotation order.
90
rESt / Hr / Er /
A-rE
Trip reset. · Hr: manual reset password required.
· Er: Electrical reset.
o “Reset” key.
o “CLR” key.
o Control power off.
· A-rE: Auto reset.
Aut / setting
value
Auto reset time. · Time range: Instant, 1 – 300 sec.
· When “Hr” is selected in “rESEt” mode “Aut” is
disabled.
trIP / 8 – 1 /
trip cause /
trip value
Show last 8 trip
causes.
· Show last 8 trip causes in order.
o Press “UP or “DN” in the “trip” mode to
show cause.
o Press “CLR” or “SET to show next or previ-
ous cause.
o To enter setup state for trip press and
hold “UP” then press “DN” then release
“DN” finally release “UP”.
tESt · Check relay normal operation.
· “tESt” is displayed the test button pressed or “CLR” for 3 sec.
· Main relay (95 – 96 – 98) & AUX relay (05 – 06 – 08) output will trip after counting
down pre-set 0-time.
Calibration Mode Cab.
To access the calibration mode press “SET” key for 5 sec. or more. To exit calibration mode press
“SET” once more.
6. Mode Rotation Order.
7. Input – Output terminals.
· DSP – AOL / AOM Standard type / with external ZCT.
Terminal diagram.
Mode Function / range Description Factory setting
P**** Password input Input password to adjust this mode group. 0000
CrPEr Calibration for “R”
current
0 Adjustment range +-0.1A to 10A by using the “UP”
and “DN” keys.
CSPEr Calibration for “S”
current
0
CtPEr Calibration for “T”
current
0
EcPEr Calibration for GF
current
Adjustment ranger +-50% by using the “UP” and ”DN”
keys.
100
oPSEt /
ON / OFF
Adjust pre-set during
the operation
· ON: Change pre-set values during motor op-
eration except “out” mode.
· OFF: No mode changes during motor opera-
tion.
ON
PedIt Change Password · Use “UP” and “DN” key to change digits
· Use “SET” and “CLR” key to move between
digits.
· Exit setting mode press “CLR”
· Save new password press “SET” and “CLR”
keys together.
7. Input - Output terminals.
DSP- AOL/AOM Standard type / with external ZCT
DIV Feature Terminal Description
Input Control Power A1(+), A2(-) · 85 – 260VAC, 50 / 60 Hz.
· 90 – 370VDC
· 24VDC
Input ZCT Z1, Z2 · External ZCT.
o V type: 200mA / 100mV
o A type: 200mA / 1.5mA
Indication Red Operating
Available on converter with display. Green Power / Stop
Yellow Trip
Output Main Trip 1c: 95-96-98
· Over current.
· Under current.
· Locked rotor.
· Phase loss.
· Reverse phase.
· Ground fault.
· Current Unbalance.
Output Aux Trip 1c: 05-06-08 · Au-o/ oFF / Ec / AL / uc / Ec-tb.
· Excluded from main trip except oFF / Ec-tb.
8. Control Key Operation.
“SET” key · Press “SET” key to enter setting mode, then password (P0000 factory password).
· Move cursor from left to right by pressing “CLR” confirming password.
· Change password by using “UP” & “DN” keys.
· To exit press “SET” & “CLR” keys together or wait 15sec.
Key functions · “SET”: Backward direction / to exit setting mode.
· “CLR”: Forward direction.
· “UP” & “DN”: change number or character in pre-set mode.
“SET” key & “CLR” key
to select mode
· Select mode by using “SET” or “CLR” key.
“UP” key & “DN” key
to adjust value
· Change the pre-set value by pressing the “UP” or “DN” key.
“SET” key & “CLR” key
to store changes
· Save changed value by pressing both “SET” and “CLR” keys together or after 15
sec.
“CLR” key · Press “CLR” key during run time to halt display rotation of values.
· Move through run time values one by one by pressing “UP” or “DN” key.
Check pre-set mode
value during opera-
tion
· Check mode and value while in run time by pressing “SET” key once.
· Mode and pre-set value alternate.
· Press “CLR” key once to move to next mode.
· Press “SET” & “CLR” keys together to exit mode or wait 10 sec.
· No changes to per-set values in this mode.
Test / Reset: “CLR”
key
· Checks relay operation.
· “tESt” displayed when test button pressed or “CLR” key held for 3 sec, to exit press
“CLR” key or test button.
· Main trip (95-96-98) & AUX trip (05-06-08) will trip after pre-set o-time (definite T-I).
· LED on converter is on after the trip.
· To rest press “CLR” once.
9. Trip Indication.
Trip cause and value appear alternatively.
Trip Display Cause
Over current (oc) Trip caused by over current in phase L1.
Under current (uc) Trip caused by under current in phase L1.
Current unbalance Trip caused by unbalanced current in phase L3.
GF Trip caused by ground fault current.
Phase loss Trip caused by phase loss L1 to load.
Reverse phase Trip caused by reverse phase to load.
Locked rotor Trip caused by locked rotor in phase L2 during
motor start.
“Ec-ct” flashing ZCT is not connected to Z1 – Z2 when motor
stopped when “Ec” selected.
10. T-I Characteristics.
· Definite.
· Inverse.
11. Indication rotation.
· 3 phase current (L1, L2, L3), Earth current, Load factor.
12. Trip timing diagrams.
· Over current protection / “Au-o” mode: OFF / AUX (05-06-08).
· GF protection / “Au-o” mode: Ec (05-06-08).
· GF protection / “Au-o” mode: Ec-tb (05-06-08).
13. Application Diagram.
· DSP-AOL.
· DSP-AOM.
14. Dimensions.
AOL Type.
AOM Type.
· Display