Listec d-LIST SCU 835, Instructions For Use Manual

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SCU 835 / SEC 15 Instructions for use
Contact at P304 Signal Cable colour
B-FLT Fault SEC II - COM (changeover) [WH]
B-FLT Fault SEC II - NC (normally closed) / NO (normally open) [BN]
B-ALM Alarm SEC II - NC (normally closed) / NO (normally open) [BN]
B-ALM Alarm SEC II - COM (changeover) [WH]
Table 20: Pin assignment at P304
In case of an alarm, the alarm relays signal the exceeding of the set differential and/or maximum temperature
threshold values at cable connection I / II .
In case of a fault, the fault relays signal malfunctions of the sensor control unit SCU 835 , the sensor cables SEC 15
and the individual sensors ESD-A5 to cable connection I / II .
Normal state – device in operation:
Relay contact at the Mainboard SCI 835 Relay / LED state
Alarm relay P305 - A-ALM Switched off - no alarm at I
Fault relay P305 - A-FLT Switched on - no fault at I
Alarm relay P304 - B-ALM Switched off - no alarm at II
Fault relay P304 - B-FLT Switched on - no fault at II
Table 21: Displays normal state
Alarm / fault state – device in operation:
Relay contact at the Mainboard SCI 835 Relay / LED state
Alarm relay P305 - A-ALM Switched on - alarm at I
Fault relay P305 - A-FLT Switched off - fault at I
Alarm relay P304 - B-ALM Switched on - alarm at II
Fault relay P304 - B-FLT Switched off - fault at II
Table 22: Displays alarm / fault state
Note
If the unit is not in operation, the fault relay fails and a fault is indicated at the FACP .
Optionally, the relay contacts on the two 14-pin IC sockets can be equipped with a 0 Ω bridge or with loop resistors
for closed-circuit current monitoring R* .
Max. switching current Max. switching voltage Max. switching power
Relays at MB SCI 835 1 A +30 V DC 30 W
Table 23: Relay outputs
60T328-02-LI-en / 29.01.2021 LISTEC GmbH Page 53/112
Fig. 105: Alarm as NO / fault as NO Fig. 106: Alarm / fault with loop resistors R*
B-ALM
A-FLT
A-ALM
B-FLT
II I
B-ALM
B-FLT A-FLT
A-ALM
II-R* I-R*