Rockwell Automation 1425 PowerMonitor Wireless 250 - Manual (Page 27)

Rockwell Automation Publication 1425-UM001A-EN-P - January 2012 27
Hardware Installation Chapter 2
Figure 20 - Delta, 3-wire, 480V AC, 1425-Dxxx(x)3-MOD-480 Unit
Maximum voltage V(L1-L2) and V(L2-L3) is 520V AC rms; V(L1-N),
V(L2-N) and V(L3-N) is 300V AC rms. Designed for use on up to 520V AC
circuits. This device is Isolation Class 1. The green/yellow wire must be
connected to earth ground. The 24V DC power supply must be NEC Class 2. An
example of a suitable power supply is the Allen-Bradley 1606-XLP15E, 15-watt,
24 V DC with a single-phase AC input.
Current Transformers
1. Observe the correct phase assignment of current transformers with respect
to the voltage phase connections.
Refer to the wiring diagram for the applicable PowerMonitor W250
model. If phase assignment and polarity are not correctly observed, the
PowerMonitor W250 unit produces incorrect energy data.
RT1
RT3
L1
Fuses (customer provided)
L2 L3
PowerMonitor W250 Unit
L3 L2 L1 N
24V DC Power (customer provided)
+
-
BLK
BRN
TIP Note that the black 24V DC - wire is internally connected to the green/yellow
ground wire.
ATTENTION: Disconnect and lock out all sources of electric power to the
location in which the PowerMonitor W250 wire is to be installed and the circuit
to which it will be connected.
The current sensors are intended to be used only on insulated cable. Do not apply
to uninsulated cable or bus bar. The current sensors are intended for no more than
50 open/close operations. Do not attempt to use them as a clamp-on meter.
The current transformer mating surfaces must be kept free of particles and other
contamination, otherwise accuracy may be compromised.