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DPU1U SERIES
INSTALLATION & OPERATING MANUAL
P O W E R I N G T E C H N O L O G Y
Document Number: DPU1U-MAN Rev. 4
dpu1u-man-rev1-0719.indd
PIN
FUNCTION
CONTACT SCHEMATIC
NC
N.C. (normally closed)
RELAY
CONTACTS
OUTPUTS
N.C.
C
N.O.
C
C (common)
NO
N.O. (normally open)
Table 5. Alarm Relay Contacts
“Normally Closed” and “Normally Open” are defined with the combination panel powered
and providing power to all outputs, i.e. no circuit breakers tripped AND when the input
power is connected to a side (A or B), the Form C relay of that side is energized. If there
is either loss of input power, one or more circuit breakers trip or the relay is de-energized,
the normally open contacts close and the normally closed contacts open. See table 6.
RELAY STATE MEANINGS
Relay State
Meaning
Energized (N.C. is closed)
OK
De-energized
(N.C. is open)
Breaker Trip
or
Breaker OFF
or
Fuse Blown
No Input Power
Table 6. Relay State Definitions
The ratings of the relay contacts are 0.6A at 125VAC or 2A at 30VDC. The spring clamp
terminals accept wire sizes nos. 16 to 26 AWG.
9.6
Chassis Ground Connection.
Just below the Form C relay contact terminals is the chassis
ground terminal. This terminal is a no. 8-32 stud with a nut.
NOTE THAT IT IS ESSENTIAL THAT THIS TERMINAL IS CONNECTED TO THE
SYSTEM FRAME GROUND TO ENSURE SAFE OPERATION.
