BILS-10003 rev E
20
304
Bypass switch wiring / Phase check (for Hardwired units)
Note: This test is only required if the bypass switch is external to the UPS
After installation of electrical wiring is completed and before operating the bypass
switch, it is necessary to insure proper phasing of commercial power feeding the
bypass switch with output power from the Herytage UPS.
Bypass switch wiring / phase test
The wiring / phase test should be performed by qualified service personnel or
electrician.
1.
Insure all load equipment is turned
OFF
and that the main circuit breaker in the
load distribution panel feeding the Herytage UPS and your load equipment is
OFF
. The AC disconnect located on the bypass switch, and the bypass switch
should also be in the
OFF
position
.
2.
Remove wiring access panel on bypass switch.
3.
Turn
ON
DC breaker located on battery cabinet.
4.
Turn
ON AC
breaker in the main service panel feeding the bypass switch.
5.
Turn
ON
AC disconnect switch, located on the bypass switch.
6.
Turn key-switch to
ON
position; rocker switch on 2 thru 4K products.
7.
Turn bypass switch to
UPS
position. Insure the single green LED located on
UPS is
ON,
and that the single yellow LED is
OFF.
8.
With an AC volt-meter, measure between the following points on terminal
blocks within the bypass switch and record the voltages measured.
Utility Power Terminals
Load Terminals
N to L1_______
N to L1_______
N to L2_______
N to L2_______*
L1 to L2_______
L1 to L2_______
* If output voltage selected is 120/208 you will measure 88VAC between N and L2
on load terminals, this measurement will not be within 10vac of the same
terminals measured on the Utility power terminals – make sure no load
equipment is on this output winding.
Voltages measured on Utility Power terminals should be within ten volts of terminals
labeled UPS load
. If not, do not use a Make Before Break bypass switch
. If you
need assistance call Legacy Power Conversion customer service for assistance.
