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The following table lists backfeed protection devices (AC contactors) that can be used as an external
isolating device for backfeed protection. Only use AC contactors listed in the table.
Table 1. Backfeed Protection Devices
Manufacturer
ABB France (E12527)
Tianshui 213 Electrical Apparatus Co., Ltd.
(E203071)
(alternative)
Tianshui 213 Electrical Apparatus Co., Ltd.
(E203071)
(alternative)
NOTE:
Although the UPS does not contain anti-backfeed (ABF) relays, some backfeed protection is provided.
For example, if some components are damaged in battery mode, the output voltage may feed back to the input.
In this case, a current transformer (CT) is used to detect the bypass current feedback voltage. If a current
backfeed fault condition is detected, the UPS will terminate the inverter output to avoid the personal injury.
Connect the input and ground wires to the terminal block according to Figure 22 and Table 2.
6
Figure 22. Connecting Terminal Block Wiring
Type
A75-30
GSC1(CJX4-d)-6511
GSC1(CJX4-d)-8011
1
Rating
220–240 Vac, 105A
25 HP at 208V, 30HP at
240V
220–240 Vac, 68A
25 HP
220–240 Vac, 80A
30 HP
2
3
|
Installation
31
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