Operation
67
RCMS460-490_D00067_03_M_XXEN/12.2017
8. CT monitor.
Enable or disable the measuring current transformer connection monitoring.
on
Measuring current transformer connection is monitored.
Connection interruption, short-circuit or failure of the power supply
unit generate an alarm message after 20 seconds at the latest (W…AB
series) (Fault: CT connection). The "ALARM 1" LED lights up.
off
Measuring current transformer connection is not monitored.
9. Relay mode (RCMS490-D…/-L… only)
These devices have an alarm relay for each measuring channel (N/O contact).
Set the relay mode of operation for each relay.
N/O
N/O operation. Relay only switches in the event of an alarm.
N/C
N/C operation. Relay only switches in the event of an alarm.
N/O-T
N/O operation. Relay switches when there is an alarm or a
test.
N/C-T
N/C operation. Relay switches when there is an alarm or a
test.
off*
Contacts of the relay are always open.
on*
Contacts of the relay are always closed*.
* This function can also be activated via the BMS bus. By sending the command
"off" or "on" via the BMS bus, the switching of the relay can be activated. This
relay does not respond to alarms. It only serves as a signal converter (BMS-bus
signals/relay contact signals.
Flexible WF… measuring current transformers only:
CT monitor setting "off" must not be changed. If this is not
taken into account, the device signals a fault: "CT
monitoring".
If the relay settings only differ slightly, we recommend the
following procedure for the RCMS490:
- first set all the relays (1…12) to the same value;
- then modify the settings of individual relays.