Ice IMM 8001 User manual

Projet : IMM 8000 Référence : MU307-1-GB-A.doc
IMM 8001/8002
USER’S GUIDE
Référence secrétariat : DDP/GM/MC/452-00 Nombre de
p
a
g
es
(y
com
p
ris celle-ci
)
: 97
Diffusion : Restreinte Libre x Etat : Pro
j
et Validé x
MISES A JOUR
Nom et Visa
du rédacteur du vérificateur de l'a
pp
robateur
Traduction de la version Fran
ç
aise G. MANCIER F. JAMINET
Du MU307-1 ind.C
Ind. Date Nature des mises à jour Rédac.
A07.02.00 Edition de la version anglaise du MU307-1 ind B -
B06.08.02 Mise à jour avec le MU307-1 ind C EN
Réf. Doc C/n° 2012-1

PROTECTION
S
& CONTR
Ô
L
E
C O M M AND
E
IMM 8001 / 8002
USER'S GUIDE
ICE
Protection & Contrôle Commande
11, rue Marcel Sembat
94 140 Alfortville
Tél : (33) (0)1-41-79-76-00
Fax : (33) (0)1-41-79-76-01

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 1
CONTENTS
1 - INTRODUCTION........................................................................................................................................................................ 3
1.1. PRESENTATION OF IMM 8001 AND IMM 8002 RELAYS............................................................................................... 3
1.1.1. Protection function table ...................................................................................................................................... 4
1.1.2. Table of measurements performed........................................................................................................... 5
1.1.3. Table of digital inputs.............................................................................................................................. 6
1.1.4. Functions related to start control orders................................................................................... 6
1.2. PURCHASE ORDER REFERENCES ................................................................................................................................7
1.3. CONNECTION DIAGRAM RATINGS TO BE CONFIGURED ON SITE ............................................................7
2 – MECHANICAL INSTALLATION ............................................................................................................................................ 8
2.1. INTRODUCTION...................................................................................................................................................8
2.2. OVERALL DIMENSIONS AND MECHANICAL CUT-OUT DRAWING...............................................................9
3 – ELECTRICAL INSTALLATION .......................................................................................................................................... 10
3.1. GENERALITY.....................................................................................................................................................10
3.2. CONNECTION DIAGRAMS .................................................................................................................................10
3.3. TERMINAL BLOCK DESCRIPTION..................................................................................................................12
3.4. AUXILIARY VOLTAGE CONNECTION..............................................................................................................14
3.5. CONNECTION OF THE CURRENTS (PHASES + EARTH FAULT)................................................................14
3.6. MEASUREMENT VOLTAGE CONNECTION .........................................................................................................17
3.7. CONNECTION OF RTDS CABLES...................................................................................................................17
3.8. RELAY OUTPUT CONNECTION.........................................................................................................................18
3.9. DIGITAL INPUT CONNECTION ......................................................................................................................18
3.10 EXTERNAL COMMUNICATION CONNECTION (DB9 REAR SOCKET) ........................................................19
3.10.1. 0-20 mA current loop configuration............................................................................................ 19
3.10.2. RS 485 configuration............................................................................................................................. 19
3.11. COMMUNICATION CONNECTION (DB9 FRONT SOCKET)..........................................................................20
4 – OPERATOR DIALOGUE......................................................................................................................................................... 21
4.1. FRONT PANEL...................................................................................................................................................21
4.2. LOCAL OPERATOR DIALOGUE.........................................................................................................................22
4.2.1. Man-machine interface general operation, items ..................................................................... 22
4.2.2. Measurements – Present status - Statistics............................................................................... 23
4.2.3. Protection parameters, reference variables............................................................................... 23
4.2.4. Configuration - Resets .............................................................................................................................. 26
4.2.5. Microdiagnostic messages.......................................................................................................................... 27
4.2.6. Password................................................................................................................................................................ 27
4.2.7. Counter reset.................................................................................................................................................... 27
4.2.8. Emergency restart : ERST key................................................................................................................ 28
4.2.9. Latching of relay P...................................................................................................................................... 28
4.2.10. Fault display (Operating level reached, alarm, trip, restart inhibited)...... 29
4.2.11. Consultation of last 5 events (alarms, trips, starts)................................................. 30
4.2.12. Consultation of start related measurements........................................................................... 30
4.2.13. Tables of parameters ............................................................................................................................... 30
4.3. REMOTE OPERATOR DIALOGUE - TRACE.....................................................................................................30
5 – FUNCTIONS – VERIFICATIONS - COMMISSIONING ............................................................................................... 31
5.1. PRELIMINARY VERIFICATIONS ....................................................................................................................31
5.2. TEST EQUIPMENT ............................................................................................................................................32
5.3. PROTECTION AGAINST THERMAL OVERLOADS [49].................................................................................33
5.4. PROTECTION AGAINST TEMPERATURE RISES [26] IMM 8002 ONLY.......................................................42
5.5 START AUTHORISATION FUNCTION [5].....................................................................................................46
5.6. TOO LONG START PROTECTION [48] .........................................................................................................52
5.7. ROTOR STALLING AFTER START [51STALL] ...............................................................................................56

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 2
5.8. ROTOR STALLING PROTECTION DURING START [51LR] ..........................................................................59
5.9. PROTECTION AGAINST CURRENT UNBALANCES (PHASE LOSS) [46] ....................................................62
5.10.................................................................................................................SHORT-CIRCUIT PROTECTION [50] 67
5.11................................................................................................................... EARTH FAULT PROTECTION [51N] 70
5.12. MINIMUM LOAD PROTECTION (PUMP UNPRIMING) [37 P/I].......................................................................74
5.13. UNDER VOLTAGE PROTECTIONS [27] [27ST]..............................................................................................79
5.14. UNDER VOLTAGE FOR RE-ACCELERATION [27RC] ...................................................................................83
5.15................................................................................................................... OVER VOLTAGE PROTECTION [59] 86
5.16. ALARM FOR TRIP LOOP FAULT SUPERVISION...........................................................................................89
6 - COMMISSIONING – ABNORMAL SITUATIONS.............................................................................................................. 92
7 - MAINTENANCE....................................................................................................................................................................... 94
7. 1............................................................................................................................................... BASIC CASE TEST 94
7. 2................................................................................................................................ ELECTRONIC MODULE TEST 95
8 – Annexes : TEST SHEET ................................................................................................................................................. 95

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 3
1 - INTRODUCTION
1.1. PRESENTATION OF IMM 8001 AND IMM 8002 RELAYS
The IMM 8001 and 8002 relays are digital relays designed to protect medium-voltage motors as well as
high-power low-voltage motors. They combine all the functions required to provide a sophisticated
protection of all types of AC motors in a single compact case.
Due to the number of built-in protections, adjustment extent, and possible use of digital inputs as a
complement, the IMM 8000 relays are suitable for most specific motor protection problems.
All the protections are detailed in the tables, chapter 1.1.1.
All the measurements are detailed in the tables, chapter 1.1.2.
Main features of the IMM 8000 relays :
most functions built into the same case,
many measurements,
energy counters ,
digital signal processing,
fault diagnosis,
time stamped events for communications,
4 output units using a matrix set-up,
simple and user-friendly man-machine interface,
multi-language messages,
0-20 mA current loop/RS 485 digital serial communication,
double built-in CTs 1/5 A,
metal case with withdrawable electronics,
2 ranges of auxiliary power supplies with extended ranges,
6 digital inputs for relay functionality extension.
The IMM 8002 relays are different from the IMM 8001 relays through the presence of temperature
protection consisting of three Resistive Temperature Detectors.

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 4
1.1.1. Protection function table
ANSI CODE PROTECTION Trip Alarm Restart inhibit
[49] Thermal overload trip Ith>
[49] Thermal overload alarm Ith> Al
[26] * Level 1: temperature rise Sxθ1 (Nota 1)
[26] * Level 2: temperature rise Sxθ2 (Nota 1)
[26] * Wiring fault Nota 2•
[5-49] Start permitted by thermal state Nota 3
[5-66] Number of start limitation Nota 4
[5-27/59] Start permitted by voltage range Nota 5
[48] Too long start Ist>
[51STALL] Rotor stalling after start Istl>
[51LR] Rotor stalling during start Ilr>
[46] Current unbalance Ineg>
[50] Short-circuit I>>
[51N] Earth fault (inverse time) I0>
[51N] Earth fault (definite time) I0>>
[37P/I] Loss of load P< or I<
[27] Under voltage after start U<
[27ST] Under voltage during start Ust<
[27RC] Under voltage for re-acceleration Urc<
[59] Over voltage low-set level U>
[59] Over voltage high-set level U>>
Trip loop fault TSUP>
* IMM 8002 only
Nota 1 : x = 1, 2, 3 = Number of the detector.
Nota 2 : •Display "Dw Sx (with x= Number of the detector) for fault "open wire"
•Display "Ds Sx (with x= Number of the detector) for fault "wire in short-circuit"
Nota 3 : Switch the display to the item "thermal state motor"
Nota 4 : Switch the display to the item " Prohibited time
Start remaining"
Nota 5 : Switch the display to the item "Measure U3.1 voltage"

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 5
1.1.2. Table of measurements performed
(classification according to local display items)
MEASUREMENTS UNIT DESIGNATION
Measurement item
Current
Line current A I1 and I3
Line current In I1 and I3 (in In machine)
Mean current A IMean (mean for I1 and I3)
Mean current In Imean (mean for I1 and I3 in In machine)
Positive phase sequence current In IPos
Negative phase sequence current In INeg
Earth fault current A IoZCT (ring CT) or Io3CT (residual connection)
Earth fault current INo IoZCT (ring CT) or Io3CT (residual connection)
Thermal state θ
Voltage
Phase/phase voltage KV U31
Frequency Hz F
Powers/energies
Active power K/MW P : unit according to value
(measurement on 4 quadrants)
Reactive power K/MVAR Q : unit according to value
(measurement on 4 quadrants)
Power factor cos θ
Active energy K/M/GWh Wa: unit according to value
Exported reactive power K/M/GVARh Wr+: unit according to value
Imported reactive power K/M/GVARh Wr-: unit according to value
Temperatures
Temperature per channel (IMM 8002) °C Ch1 Ch2 Ch3
Present status item
Start-related values
Last start time 0.1s Tst
Remaining start authorisation time min Trem
Start inhibit time min Tinh
Number of remaining starts - Σst
Current for last start IPos in In Ist
Advised thermal time constant min Tau-A
Statistics item
Maintenance
Number of trips - Σtrip
Number of starts - ΣSt
Number of ERST - ΣERST
Motor operating hours h Rh
Last 5 trips/alarms/Starts
Trip fault value - According to variable
Trip time 0.01 s

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 6
1.1.3. Table of digital inputs
DIGITAL INPUT STATUS FUNCTION
EL 1 ON Device interlock
EL 2 ON/OFF External trip (relaying with T P A or B)
EL 3 ON Contact for re-acceleration
EL 4 ON Speed contact
EL 5 ON Emergency restart : ERST (RAZ [49] and [5])
EL 6 ON Thermal state reset : (RAZ [49])
Note :
The 6 digital inputs operate according to status and are put into serviced when they are
polarised to +24V (see chapter 3.9.). To use the EL2 input, the function must additionally be put
into serviced as shown in the table above.
The state of the 6 digital inputs can be displayed by the device :
0 indicates that the digital input is not put into serviced,
1 indicates that the digital input is put into serviced,
(EL 2 status can only be read, if EL 2 is in service)
1.1.4. Functions related to start control orders
These functions are initialised by a start control order that the relay detects at the beginning of motor
start (internal or external control order).
3 functions are put into serviced only during the start period : the [48], [51LR], [27ST] functions.
2 functions are put into serviced only after the start period : the [51 STALL], [27] functions.
The [37 P/I] and [27RC] functions are put into serviced incessantly during the motor operation (the
[37P/I] function is really put into serviced after an adjustable start time-delay).
All the other protection functions are not related to the start control order, and can be permanently put
into serviced.
Motor ON/OFF
Motor Start
Period
Functions put into serviced during [48] [51 LR] [27 ST]
Start period
Functions put into serviced after [51STALL] [27]
Start period
Function put into serviced during [37 P/I] [27 RC]
Motor operation

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 7
1.2. PURCHASE ORDER REFERENCES
Choice of relay :
•IMM 8001 without RTD diagram 38A5
•IMM 8002 with 3 RTDs diagram 38A6
Choice of connection diagram :
•3 CTs connection (code Aa), or ring CT connection (code Ab)
•auxiliary voltage : 19 to 70 V (code Ba), or 85 to 255 V (code Bb)
•local man-machine interface language : English/French (code Ca), or another language
(please consult us)
•communication interface : current loop (code Da) or RS 485 (code Db)
•case presentation : projecting rear connection (code Fa), or flush rear connection (code Fb)
1.3. CONNECTION DIAGRAM RATINGS TO BE CONFIGURED ON SITE
Rated value parameters with respect to connection :
•nominal frequency : 50 or 60 Hz,
•nominal secondary voltage PT: 100 - 110 – 120, or 240 V,
•nominal current : 1A or 5A (see connection diagrams),
•earth fault current : ring CT or residual connection (see connection diagram).

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 8
2 – MECHANICAL INSTALLATION
2.1. INTRODUCTION
♦The relay includes :
- a basic metal case comprising the internal step-down transformers and the power terminal block
(current and voltage inputs + case earth).
- a withdrawable metal case comprising the electronic components and low voltage input and output
connectors.
♦The basic case can be connected in advance to the CT measurement and then receive the
withdrawable part (the connection is provided for 4 mm² maximum cables).
♦The wiring of the low voltage inputs and outputs to the withdrawable electronic module can be
prepared in advance on the 18-pin female connectors. The connection provides for 18 wires of 1 mm²
maximum. These connectors are fitted with a plastic cover, and 2 screws are used to attach them to
the male connectors of the withdrawable electronic module.
♦A grey frame around the front panel is provided with an upper and a lower recess. It makes relay
inserting and withdrawing easier.
♦A locating pin located at the rear of the withdrawable module is used to position the electronic
module in the basic case. The two parts are locked together by means of a knurled screw.
To insert the device :
- insert, then slightly push the electronic module until the centering pin offers a resistance. Then
fully push till reaching the stops, and lock the device by using the knurled screw located at the
rear.
Note : if the electrical connection between the basic case and the withdrawable part is not properly
established, a fault message shall appear on the display during self-tests on auxiliary voltage
application, and the Watchdog is activated.
To withdraw the device :
- Unscrew and unplug the rear female connectors.
- Unlock the knurled screw located at the rear.
- Get hold of the grey frame of the front panel by inserting hands in the upper and lower recess.
- Extract the module by pulling forward.

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 9
2.2. OVERALL DIMENSIONS AND MECHANICAL CUT-OUT DRAWING

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 10
3 – ELECTRICAL INSTALLATION
3.1. GENERALITY
From the connection diagrams below and the communication network diagram, as required, make the
different connections using the physical identifications of the terminal blocks given in paragraph 3.3.
3.2. CONNECTION DIAGRAMS
IMM 8001

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B 11
IMM 8002

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 12
3.3. TERMINAL BLOCK DESCRIPTION
Power terminal block
Rear view
Voltage phase 3
Voltage phase 1
Earth fault hot point IN = 5A (residual connection)
Earth fault hot point IN = 1A (ring CT or residual connection)
Earth fault common IN = 5A (residual connection)
Earth fault common IN = 1A (ring CT or residual connection)
Hot point phase 3 IN = 5A
Hot point phase 3 IN = 1A
Common phase 3 IN = 5A
Common phase 3 IN = 1A
Hot point phase 1 IN = 5A
Hot point phase 1 IN = 1A
Common phase 1 IN = 5A
Common phase 1 IN = 1A
Device case (ground), RTSs shielding winding.
21
20
19
18
17 16
15 14
13 12
11 10
9 8
7 6
5 4
3 2
1

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 13
Input/output terminal blocks A and B + communication terminal block X
Rear view
NO contact a 18 18 EL1 (DI)
Common contact a 1 17 17 EL2 (DI)
NC contact a 1 16 16 EL3 (DI)
NO contact b 1 15 15 EL4 (DI)
Common contact b 1 14 14 EL5 (DI)
NC contact b 1 13 13 EL6 (DI)
NO contact p 1 12 12 EL control (DI)
Common contact p 1 11 11 Common EL (DI)
NC contact p 1 10 A B 10 N.C.
NO contact t 1 99 RTD 1, connection
Common contact t 1 88 RTD 1, connection
NC contact t 1 77 RTD 1, hot point
Common contact w 1 66 RTD 2, connection
NC contact w 1 55 RTD 2, connection
Output common p.s. 24 V 44 RTD 2, hot point
Output +24V p.s. 24 V 33 RTD 3, connection
Aux. Voltage Input 22 RTD 3, connection
Aux. Voltage Input 11 RTD 3, hot point
9oo5
Output depending on choice 8o
o4
Current loop or RS485 7o
o3 X
See chapter III.10 6o
o2
o1

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 14
3.4. AUXILIARY VOLTAGE CONNECTION
Recommendations :
Before making the connection, it is important to verify that the value of the auxiliary voltage,
considering possible variations, is within the range indicated on the front panel label :
•low voltage range 19 to 70 V DC or AC
•high voltage range 85 to 255 V DC or AC
Connection of the auxiliary voltage is done on terminal block ‘A’, terminals A1 and A2. The
connection direction is indifferent.
Connection to the earth is done via terminal 1 of the power terminal block.
3.5. CONNECTION OF THE CURRENTS (PHASES + EARTH FAULT)
Phase currents I1 and I3
Choose the suitable relay current inputs depending on the secondary CTs nominal value.
For each phase, the relay has a 1A input and a 5A input, see chapter 3.2.
The parameter range of the relay allows a CT primary nominal value between 10A and 10 000 A.
Characteristics of recommended current transformers : 5 VA Class 5 P 15.
Caution : comply with the connection direction specified by the connection diagram (the point
represents the direction of the flow of current).
Earth fault current Io
Residual connection mode
In the event of earth fault current measurement in residual connection mode, it will be required to
have 3 CTs instead of 2.
In this case, preferably choose use of operating level Io> which is inverse time to let through earth
fault currents produced on motor starting.

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 15
If the definite time operating level Io>> is in service, the use of a steadying resistor as defined below
is recommended.
The inaccuracy of the CTs measurement during the starting or re-acceleration periods
may result in unexpected protection trips. To solve these problems, it is highly
recommended to use a stabilising resistor connected in series with the relay earth fault
input.
Simplified formula to calculate ohmic value :
Rst = [ >>
>
Io
IstxINTcxRTC ] – RTC – R relay
with :
Rst = calculated stabilising resistance, in Ohm
RTC = line CTs secondary resistance, in Ohm
INTc = CTs rated value, in A
Ist> = starting current, in multiples of In
Io>> = earth fault protection operating level, in A
R relay = relay input resistance: 0.2 Ohm
Type of resistor to be used :
High power adjustable wire-wound resistor with a rheostat-type connection :
0 - 5 Ohms 240 W for secondary CTs with IN = 5A
0 - 20 Ohms 240 W for secondary CTs with IN = 1A
Choose the suitable earth fault input of the relay depending on the secondary nominal value of the
protection CTs. The relay has 1A earth fault input and 5A input (see chapter 3.2.).
Connection to ring CT
Connection to a ring CT is done on the ring CT input, terminals 14 and 16, which is the same as the
residual connection 1A input.
The relay can operate with a CEE 100-turn ring CT
(see mechanical characteristics in drawing No 142941) :
- closed 100-turn ring CT for indoor use, type TF 50-1, TF 80-1, TF 145-1, TF 198-1, TF
245-1
- closed 100-turn ring CT for outdoor use, type TFE 40-1
- split 100-turn ring CT for indoor use, type TO 105-1

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 16
When earth fault detection is done with this type of ring CT, the rated value INo is the nominal value
of the ring CT, i.e. 100 A, and the maximum sensitivity of the earth fault protection is 1 A.
The relay can operate with a 50-turn ring CT (not provided by CEE).
When earth fault detection is done with this type of ring CT, the rated value INo is the nominal value
of the ring CT, i.e. 50 A, and the maximum sensitivity of the earth fault protection is 0.5 A.
Parameters for the ring CT nominal value (100 turns or 50 turns) are assigned in the item "Rated
Values".
Caution :
-as is shown on the connection diagram, it is imperative to run the ground screening through
the ring CT again to avoid measurement of any spurious current flowing in the screen.
Important note :
The equipment is differently configured depending on the type of earth fault current
detection with residual connection (3CTs) or ring CT (ZCT). The label with the
characteristics on the front panel defines the option.
To change configurations, carry out the following operations :
- Extract the electronic module.
- On the left side of the basic case, a 2-position switch can be seen through a square hole.
To configure the device in the residual connection mode :
- set the 3CT/ZCT switch to the 3CT position (= high position).
- configure the device in the 3 CT connection mode in the item "Rated Values".
To configure the device in the ring CT connection mode :
- set the 3CT/ZCT switch to the ZCT position (= low position).
- configure the device in the ZCT connection mode in the item "Rated Values".
3 CT
Z CT

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 17
3.6. MEASUREMENT VOLTAGE CONNECTION
The primary nominal value of the PT will be between 380V and 100 000V (setting range).
The secondary nominal value of the PT will be 100 - 110 – 120, or 240 V. The relay handles these 4
voltages as chosen (parameter assignment in the item "Rated Values").
Voltage connection is done between phases (U13) to the relay at terminals 19 and 21 of the power
terminal block (terminal 19: phase 1, terminal 21: phase 3).
Caution :
- comply with the connection direction specified by the connection diagram (the point
represents the current direction of flow).
Recommended voltage transformer characteristics :
5 VA class 1 or 0.5
3.7. CONNECTION OF RTDS CABLES
Only the IMM 8002 relay has a temperature detection unit (3 RTDs PT 100, or NI 100, or NI 120, or
CU 10).
Use of 3 wires per RTD is recommended so that the relay automatically compensates for the wiring
length.
The maximum resistance of the wiring will be less than 80 Ωfor platinum and nickel RTDs,
and less than 8 Ωfor copper RTDs.
Note : A wire of diameter 0.5 mm has a resistance of about 87 Ohms at 20°C for 1 km long.
Use of shielded cables is recommended as soon as the distance exceeds a few metres. Connect the
shielding(s) as directly as possible to terminal 1 (relay case). The other side of the shielding to the
RTD will not be connected. The length of the cable will be less than 1 km.
In the case of 2 wire connection, it is possible to compensate for the unbalance due to the wiring by
inserting a compensating resistor ‘Rcomp ‘ equivalent to the resistance of a wire (see test diagram for
the verification of the TEMPERATURE protection BY RTDS [ 26 ]).
When a RTD is not connected, it is absolutely essential to disable the channel concerned (Nothing
position). If this is not done, the relay will permanently provide a «wiring fault» alarm.

IMM 8001/8002 – Digital Motor Protection Relay ICE / CEE
___________________________________________________________________________________________
_
IMU307-1 GB Ind. B 18
3.8. RELAY OUTPUT CONNECTION
The IMM 8000 relay has 4 output units (T, P, A, and B) fitted with an inverter + 1 Watchdog (W).
All the output units have the same contact ratings (see technical characteristics), and all the
protection functions can be routed to each unit T, P, A, or B, irrespective of the unit.
Trip Relay T is normally used for switching device trip control orders.
Authorisation Relay P (permit) is normally used as a start authorisation/inhibition relay. Relay P is
energised if start is inhibited. Therefore, its contact NC will be wired in series in the "Ready to
Start chain" of the motor.
On single coil contactors, the positioning contact of the switching device will have to be wired in
parallel to the contact used in the "Ready to Start chain".
Relay P can be latched to inhibit any new start without voluntary local acknowledgement. Enabling
or disabling of latches for P is done in the SUPERVISION item, and acknowledgement of latches is
done at relay front panel level (see chapter 4.2.9.).
Relays A and B are normally used as alarm relays.
Relay W is the Watchdog alarm relay.
3.9. DIGITAL INPUT CONNECTION
The IMM 8000 relay has 6 digital inputs EL1 to EL6, and a control digital input Cnt used to make
sure that connector B is properly plugged in.
the common point at terminal B11 must be connected to terminal A4 or at the "-" terminal
to an external 24 VDC power supply.
each contact used will be connected on one side to the corresponding input (B13 to B 18) ;
the other side will be connected to terminal A3 or at the "+" terminal to 24 VDC of an
external power supply.
if an external power supply is used, the voltage shall be between 20 and 28 VDC.
reversal in the power supply direction is not destructive but inhibits any operation of the
digital inputs.
input Cnt - terminal B12 - will be preferably polarised to check the plug-in connector B.
If this is not done, during the self-tests on auxiliary voltage application, the display will
temporarily indicate the message "WARNING : CTRL IN No connect".