Page 10
DPP1U SERIES
OPERATING MANUAL
P O W E R I N G T E C H N O L O G Y
Document Number: DPP1U-MAN Rev. 6
dpp1u-man-Rev6-0719.indd
Connection is made via two Phoenix Contact spring clamp terminal blocks. ALM-B is
for the Form C relay contact of side B and ALM-A is for the Form C relay contact of side
A. The terminals, viewed from left to right, are the normally open (NO) common (C) and
normally closed (NC) contacts, respectively. See figure 8 below.
“Normally Closed” and “Normally Open” are defined with the distribution panel powered
and providing power to all outputs, i.e. no circuit breakers tripped.
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.
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.
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.
10.0 UNPACKING AND INSPECTION
10.1
This DPP1U Series power distribution panel was carefully tested, inspected and packaged
for shipment from our factory. The unit and circuit breakers are shipped separately. Upon
receipt of the unit it should be carefully unpacked and inspected for any damage in shipment.
10.2
If there is evidence of damage, do not attempt to test the unit. The freight carrier should
be notified immediately and a claim for the cost of the rectifier system should be filed with
the carrier for direct reimbursement. Be sure to include the model and serial number of the
damaged unit in all correspondence with the freight carrier. Also save the shipping carton
and packing material as evidence of damage for the freight carrier’s inspection.
10.3
UNIPOWER will cooperate fully in case of any shipping damage investigation.
10.4
Always save the packing materials for later use in shipping the unit. Never ship the rectifier
system without proper packing.
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