6.4 Alarm Relay Wiring
The 3-pin connector of the relay alarm on the SRPV3 board allows the following H49
statuses:
Figure 26: Relay Alarm Wiring
Pin Signal Description
1 Normally Open
Closed=Normal Operation
Open= Power supply defect (both input voltage sources are
down) / Operating System defect (Kernel crash, processor
overload, memory leak)
2 Common
3 Normally Closed
Closed= Power supply defect (both input voltage sources are
down) / Operating System defect (Kernel crash, processor
overload, memory leak)
Open= Normal Operation
6.4.1 Using Terminal Blocks
Printed-circuit board connectors can be used:
Figure 27: Pluggable Terminal Block
The relay alarm connector shall be plugged with MSTB 2,5 HC/ 3-ST-5,08 - 1911978
manufactured by Phoenix Contact.
6.4.1.1 Recommended Wire Size
The minimum recommended wire size for terminal blocks is 2.5mm
2
.