PHASE CHECK
Eaton FERRUPS FE/QFE UPS (500 VA–18 kVA) Installation Guide
S
164201403 Rev B
www.eaton.com/powerquality
69
9.
Use an AC voltmeter to measure voltages on the terminal strip
inside the bypass switch cabinet (refer to the label on the back of
the switch's lower front cover for the terminal numbers).
Record your measurements in the following chart according to the
type of bypass switch installed. The voltages in the first column
should be nearly equal to the voltages in the second column. If the
values differ by more than a few volts, check the terminal strip
connections and correct any wiring problems.
C
A
U
T
I
O
N
If the AC input voltage is 208V, measure 88 Vac between the AC output terminals:
S
Internal Bypass Switch: N and X1 or N and X2
S
External Bypass Switch: 6 and 7 or 6 and 8
DO NOT connect any 120V LOAD to the 88V terminals.
Internal Bypass Switch
AC to UPS Load
Measurement
AC Line Input
Measurement
X1 to X2
Vac
L1 to L2
Vac
N to X1
Vac
N to L1
Vac
N to X2
Vac
N to L1
Vac
External Bypass Switch
BPE-01
AC from UPS
Output
Measurement
AC Line Input
Measurement
5 to 6
Vac
8 to 9
Vac
BPE-02, BPE-04, or BPE-05
AC from UPS
Output
Measurement
AC Line Input
Measurement
7 to 8*
Vac
11 to 12
Vac
6 to 7
Vac
10 to 11
Vac
6 to 8*
Vac
10 to 12
Vac
*60 Hz, 208 or 240V only.
