Leviton EZ-MAX - Power Requirements & Maximum Run Length; Power Control Devices - Available Supply Current

Page 118
Power Requirements & Maximum Run Length
Each Control Device used in your system has a different load (draw) and each PCD
can support a different total load (supply.) The steps for determining the total load of
your network and verifying that the supply is sufficient are simple--or at least logical:
Step 4: 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 5: Sum the required load of each Control Device, expressed in unit loads
Step 6: 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
Figure 7: 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 Control
Device (PCD)
Maxim
um
# of
Unit
Loads
Supply
(VDC)
Power Control
Device (PCD)
Maxim
um #
of Unit
Loads
Supply
(VDC)
a-2000D, 12 Circuit,
Standard Power Supply
52 12VDC Z-MAX 8 Cabinet 20 24
VDC
a-2000D, 18 Circuit,
277V,
Standard Power Supply
49 12VDC Z-MAX 24 Cabinet
(Master or Slave)
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, 18 Circuit,
277V,
Large Power Supply
117 12VDC EZ-MAX 6 24
VDC
a-2000D, 24 Circuit
Large Power Supply
114 12VDC RRP - Z-MAX Remote
Relay Panel
6 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