5.4.1 Backfeed Protection Device Specications
This equipment does not have a built-in backfeed protection device. You can add a
backfeed protection device for the input. The protection solution is as follows: If
you do not install a backfeed protection device for the input, add a warning label
on the main power disconnection device that supplies power to the UPS to warn
electrical maintenance personnel. The warning label contains information similar
to the following: "This circuit supplies power to the UPS. Disconnect the UPS
before cable connection." In addition, check whether dangerous voltages exist on
all main power connection terminals.
When battery mode is unavailable or the mains fails, certain voltage or energy in
the UPS may ow back directly, or through a leakage path, to an input terminal.
To minimize the risk of electric shocks caused by reverse feeding, install a
backfeed protection device for the UPS input.
Table 5-4 Rated voltage and current of contacts of the backfeed protection
contactor
Model
Rated Voltage and
Rated Current
Recommended
Backfeed Protection
Device Model
(Schneider Contactor)
UPS2000-H-6KRTL-L 220 V AC/230 V AC/240
V AC, 50 A
Contactor LC1-D50A
UPS2000-H-10KRTL-L 220 V AC/230 V AC/240
V AC, 80 A
Contactor LC1-D80A
Table 5-5 Control relay parameters
Recommended Model
Requirements
HONGFA: HF18FF/012 Contact type: normally closed (NC)
Breaking capacity: 250 V AC, 5 A
Coil specications: 12 V, rated current
< 1 A
OMRON: MY2N-J DC12V
Panasonic: HJ2-L-DC12V
UPS2000-H-(6 kVA-10 kVA)
User Manual 5 Installation and Cable Connection
Issue 03 (2023-08-20) Copyright © Huawei Digital Power Technologies Co., Ltd. 87
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