Neutral-To-Ground Bonding For Isolated Output - Powerware 9170 User Manual

Isolated Output Wiring Diagrams

Neutral-to-Ground Bonding for Isolated Output

As required under safety regulations issued by various regulatory
agencies, the UPS cabinet must have a ground-bond connection for the
neutral terminal of an isolated-output system. In such a system, the
customer must make the neutral-to-ground (also referred to as N-G or
neutral-to-earth) connection after selecting the desired output
configuration.
In isolated-output systems, a green and yellow neutral-to-ground
bonding wire is supplied, with one end connected to the ground (earth)
UPS terminal as shown in Figure 36. The other end of the wire (as
shown by * in Figure 36) must be attached to the proper output neutral
terminal, as specified in Figure 34 and Figure 35.
44
100/200, 110/220, 115/230, or 120/240V Out
with Isolated Output Option
Parameter 7-3-4 set to 200, 220, 230, or 240, as required.
X1 X3
X
100, 110,
115, or 120
200, 220, 230, or 240
L1
Figure 34. Isolated Outputs – Single-Phase Voltages
120/208 or 127/220V Out
with Isolated Output Option
Parameter 7-3-4 set to 208 or 220, as required.
X1 X3
X
L1
Figure 35. Isolated Outputs – Derived 3-Phase Voltages
50 or 60 Hz
X0 X2
X X
N-G Bond
100, 110,
115, or 120
N L2
50 or 60 Hz
X0 X2
X X
N-G Bond
88 or 93 120 or 127
208 or 220
N L2
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