Page 134 - EPR Catalog 2015

Insulation monitoring relays for unearthed supply systems
Operating state indication, Connection diagrams, DIP switches

LEDs, status information and fault messages CM-IWN.x LEDs, status information and fault messages CM-IWS.x

Operational state LED U LED F LED R Operational state LED U LED F LED R
(green) (red) (yellow) (green) (red) (yellow)
S t a r t- u p W OFF OFF
S t a r t- u p W OFF OFF No fault V
Insulation fault (below threshold value) V OFF
2 No fault V OFF 1) Invalid measuring result V OFF
Prewarning V W W V T
OFF
Insulation fault (below threshold value) V V 1) V

KE/w wire interruption VU 1) KE/w wire interruption (only V U OFF
CM-IWS.1)
L+/L- wire interruption during W T 1)
system start-up / test function /X CM-IWS.1: System leakage
1) capacitance too high / invalid X X OFF
System leakage capacitance too 1) measurement result
high / invalid measurement result VT W CM-IWS.2: Invalid measurement
1) result
Internal system fault 1) X X V T OFF
Setting fault 2) W W Internal system fault
Test function X OFF OFF X OFF
No fault after fault storage 3) V 4) Test function X OFF OFF
V 4) X
No fault after fault storage 3)

1) Depending on the configuration.
2) Possible faulty setting: The threshold value for final switch-off is set at a higher value than the threshold value for prewarning
3) The device has triggered after an insulation fault. The fault has been stored and the insulation resistance has returned to a higher value than the threshold value plus hysteresis.
4) Depending on the fault

Connection diagram CM-IWS.2 Connection diagram CM-IWS.1

A1 11 2CDC 252 102 F0009 A1-A2 Control supply voltage A1 11 KE 2CDC 252 103 F0009 A1-A2 Control supply voltage
S1 S2 S1-S3 Remote test
S3 S2-S3 Remote reset S1 S2 S3 S1-S3 Remote test
Lw 11
L+ L- KE w 11 S2-S3 Remote reset

R<w 12 14 L Measuring circuit/input, system connection R<w 12 14 L+, L– Measuring circuit/input, system connection
w Measuring circuit/input, earth connections w, KE Measuring circuit/input, earth connections
A1 A2 11-12/14 Output relay, closed-circuit principle A1 A2 1-12/14 Output relay, closed-circuit principle

Lw L+ L- w

14 12 A2 14 12 A2

Connection diagram CM-IWN.1, 4, 5, 6 Connection diagram CM-IVN

A1 11 21 S1 S2 S3 2CDC 252 104 F0009 A1-A2 Control supply voltage VL+ VL- 2CDC 252 010 F0013 VE Connection to CM-IWN.x - w
VS Connection to CM-IWN.x - VS
L+ L- KE w 11 21 S1-S3 Remote test VL- VL+ L+ Connection to CM-IWN.x - L+
R<w
A1 A2 12 14 22 24 S2-S3 Remote reset

12 14 L+ VS V1+ V1- L+, L– Measuring circuit/input, system connection V1+ Connection to CM-IWN.x - V1+

22 24 L- KE w A2 w, KE Measuring circuit/input, earth connections L- Connection to CM-IWN.x - L-

VS, V1+, V1 Connections for the coupling unit (if used) L- V1- L+ V1+ V1- Connection to CM-IWN.x - V1-

11-12/14 Output relay 1, open- or closed-circuit principle L+ V1+ L- V1- VL+ Measuring circuit / Measuring input

21-22/24 Output relay 2, open- or closed-circuit principle VS VE Vw VL- Connection to the system
Vw Measuring circuit / Measuring input

Connection to earth

DIP switches of DIP switch 1 ON OFF (default)
CM-IWN.1, 4, 5, 6 Operating
principle of the Closed-circuit principle g Open-circuit principle h
output relays If closed-circuit principle is selected, the output relays de- If open-circuit principle is selected, the output relays
DIP switch 2 energize in case a fault is occuring. In non-fault state the energize in case a fault is occuring. In non-fault state the
Non-volatile fault relays are energized. relays are de-energized.
storage
Position 4 3 2 1 Fault storage activated (latching) f Fault storage de-activated (non latching) e
DIP switch 3 If the fault storage function is activated, the output relays If the fault storage function is de-activated, the output
ON i u f g 2CDC 252 050 F0b09 Interrupted wire remain in tripped position until a reset is done either by the relays switch back to their original position as soon as the
detection front-face button or by the remote reset connection S2-S3. insulation fault no longer exists.
OFF j v e h DIP switch 4 This function is non-volatile.
2 x 1 c/o, Interrupted wire detection de-activated v With this
1 x 2 c/o Interrupted wire detection activated u configuration the interrupted wire detection is de-
With this configuration, the CM-IWN.1 monitoring relays activated.
the wires connected to w and KE for interruptions.

2 x 1 c/o (SPDT) contact i 1 x 2 c/o (SPDT) contacts j
If operating principle 2 x 1 c/o contact is selected, the If operating principle 1 x 2 c/o contacts is selected, both
output relay R1 (11-12/14) reacts to threshold value R1 output relays R1 (11-12/14) and R2 (21-22/24) react
(final switch-off) and the output relay R2 (21-22/24) reacts synchronously to threshold value R1. Settings of the
to threshold value R2 (prewarning) threshold value R2 have no effect on the operation.

2/67 ABB | Catalog Electronic Products and Relays 2015 | 2CDC 110 004 C0210