Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 29
Chapter 3 Power, Ground, and Wire
Figure 22 - Monitored Reset Signal Duration
The signal can be created with a momentary push button or programmatically
created with logic controller. Figure 23 shows example wire connections for
the reset. The schematic also shows an example monitoring the mechanically
linked, normally closed contacts of two contactors.
Figure 23 - Monitored Reset Connections
Monitor with Expansion Relays
Monitoring of the expansion relays is recommended. This feature is especially
useful when the expansion relay is turning on loads (for example, solenoid-
operated valves) that do not have monitoring contacts. The auxiliary output of
the expansion relay must be the 24V DC source of the reset and monitoring
input. Figure 24
shows an example of the connections for a monitored reset
with additional contactor monitoring. This type of connection can also be used
for automatic reset applications.
Figure 24 - Monitor Expansion Relay
Retriggerable Input The B1 and B2 inputs determine the type of timing function.
• B1 and B2 open: Off-delay non-retriggerable or on-delay
• B1 connected to B2: Off-delay retriggerable
• B1 connected to 24V DC: Jog
When using a PLC to generate the reset signal, set the duration to 260…2990 ms
for a more reliable reset.
+24V DC
24V DC Com
+
1
2
3
1756-OB16
1769-OB8
1746-OB4
1734-OB2
1793-OB4
S34
A1
A2
S34
A1
A2
CI, DI, DIS, or SI CI, DI, DIS, or SI
Contactor
Monitoring
Momentary Push
Button (N.O.)
PLC Output
PLC
Processor
+24V DC
24V DC Com
S34
A1
A2
X32
A1
A2
Contactor
Monitoring
Momentary Push
Button (N.O.)
CI, DI, DIS, or SI EM or EDM
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