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DPP2U SERIES
OPERATING MANUAL
P O W E R I N G T E C H N O L O G Y
Manual No. DPP2U-MAN Rev. 5
dpp2u-man-rev5-0719.indd
6.0 DESCRIPTION OF OPERATION
6.1
Power Distribution Circuits.
A simplified schematic diagram of the
distribution panels is shown in Figure 2. The battery input to each load
connects to a high-current copper bus bar from which the individual fuses or
circuit breakers distribute power to the loads. The return input connects to a
similar bus bar to which the individual loads terminate. The A and B loads are
totally independent and isolated with the exception of models incorporating
the ‘S’ option.
CIRCUIT
BREAKERS
BATT.
BATT.
INPUT
RET.
INPUT
RET.
HI-CURRENT BUS BAR
HI-CURRENT BUS BAR
HI-CURRENT BUS BAR
HI-CURRENT BUS BAR
LOADS
LOADS
1
2
3...
N
A SIDE
ALARM
CIRCUITS
B SIDE
ALARM
CIRCUITS
A SIDE
B SIDE
-S OPTION
-S OPTION
1
2
3...
N
Figure 2. Block Diagram
6.2 Alarm Circuits.
The alarm circuits detect a tripped circuit breaker and, in
this event, turn on the red part of the LEDs. The alarm circuits also each
drive Form C relay contacts. If one or more circuits open or if there is an
input power failure, the relays are de-energized and the contacts are used
to control external audible or visual alarms. The A and B alarm circuits are
also independent and isolated from each other.
LED & RELAY STATE MEANINGS
LED State
Relay State
Meaning
Green
Energized (N.O. is closed)
OK
Red
De-energized
(N.O. is open)
Breaker Trip
OFF
No Input Power
