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Step 3: Determine the maximum available current of your supply, be it a PCD or other
Power Supply. Convert this to the maximum number of Unit Loads if
necessary.
Step 4: Sum the required load of each Control Device, expressed in unit loads
Step 5: Verify that the Sum from Step 2 <= the maximum available power from your
supply in Step 1.
• If this verification fails, the Sum of required loads is > than the available
supply, either use an external power supply or reduce the number of control
devices. Or, contact our Technical Services department for help.
One Unit Load = 25mA =.025A
Load Rating Verification Formula
Power Control Devices - Available Supply Current
The Z-MAX cabinets are designed to be able to power external control loads from the
internal power supply. See the table below for the available power from each cabinet.
Power Supply Maximum Unit Loads
Power Control
Device (PCD)
Maximum
# of Unit
Loads
Supply
(VDC)
Power Control
Device (PCD)
Maximum
#
of Unit
Loads
Supply
(VDC)
a-2000D, 12 Circuit,
Standard Power
Supply
40 24VDC Z-MAX 8 Cabinet 20 24 VDC
a-2000D, 24 Circuit
Standard Power
Supply
46 12VDC Z-MAX 48 Cabinet
(Master or Slave)
20 24 VDC
a-2000D, 12 Circuit,
Large Power Supply
120 12VDC Z-MAX Switch Input
Board (accessory to
Z-MAX 24 & 48 size
Cabinets)
20 24 VDC
a-2000D, 24 Circuit
Large Power Supply
114 12VDC RRP - Z-MAX Remote
Relay Panel
6 24 VDC
NPC – XP 49 12-24
VDC
i Series e (all Racks)
NPC – DHV N/A N/A
NPC – DLR 49 12-24
VDC
Control Station A Unit Load
X
Quantity of Station A's attached
+
Same formula
for any other attached
control Station
Control Station B Unit Load
X
Quantity of Station B's attached
<
+
Power Supply's
Available Unit Load
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