UPS Electrical Installation
10
Switch Auxiliary Inputs Dry Contacts
Control Status Output Dry Contacts
Status signals are outputs through volt-free, normally open and normally closed contacts.
2.3.2 Load Bus Synch Connection
Table 3 Circuit breaker or switch auxiliary contact Inputs
Item
Terminal
Block Pin
Connects to
(description of external item)
Description
of interface
Rectifier Input Breaker
(RIB), Form C
TB0810
1
CB or Switch aux. contact,
closed = CB or switch is closed
Input, protected
2 CB or Switch aux. contact, common
+24V, 10mA,
current limited
3
CB or Switch aux. contact,
closed = CB or switch is open
Input, protected
Maintenance Isolation
Breaker (MIB), Form C
TB0811
1
CB or Switch aux. contact,
closed = CB or switch is closed
Input, protected
2 CB or Switch aux. contact, common
+24V, 10mA,
current limited
3
CB or Switch aux. contact,
closed = CB or switch is open
Input, protected
Bypass Input Breaker
(BIB), Form C
TB0812
1
CB or Switch aux. contact,
closed = CB or switch is closed
Input, protected
2 CB or Switch aux. contact, common
+24V, 10mA,
current limited
3
CB or Switch aux. contact,
closed = CB or switch is open
Input, protected
Maintenance Bypass
Breaker (MBB), Form C
TB0813
1
CB or Switch aux. contact,
closed = CB or switch is closed
Input, protected
2 CB or Switch aux. contact, common
+24V, 10mA,
current limited
3
CB or Switch aux. contact,
closed = CB or switch is open
Input, protected
Table 4 Control status output contact
Item
Terminal
Block Pin
Connects to
(description of external item)
Description
of interface
EPO Status
Form C
TB0823
1
Other equipment input,
closed = EPO not active
Relay contact, 12A, 250VAC, normally
closed, rest position = closed
2 Other equipment input, common Relay contact, common
3
Other equipment input,
closed = EPO active
Relay contact, 12A, 250Vac, normally
open, rest position = open
Maintenance
Bypass
Enable Form C
TB0821
1
Maintenance Bypass Cabinet,
closed = load not on inverter
Relay contact, 12A, 250Vac, normally
closed, rest position = closed
2
Maintenance Bypass Cabinet,
common
Relay contact, common
3
Maintenance Bypass Cabinet,
closed = load on inverter
Relay contact, 12A, 250VAC, normally
open, rest position = open
Table 5 Load Bus Synch connection
Item
Terminal
Block Pin
Connects to
(description of external item) Description
Analog Load
Bus Sync. (LBS)
TB0826
1 Phase A from LBS Input to voltage dropping resistors
3 Phase B from LBS Input to voltage dropping resistors
5 Phase C from LBS Input to voltage dropping resistors
