Backfeed Protection - CyberPower OL6KRT3UPM User Manual

BACKFEED PROTECTION OPERATION
1. If the Bypass circuit is shorted and the UPS is running in Line Mode or Battery Mode, backfeed protection will be active and the external isolation device
(Magnetic Contactor) will open.
2. Save your data and perform a controlled shutdown.
3. Contact CyberPower for repair.
WITHOUT BACKFEED PROTECTION CONFIGURATION
1. Hardwire the input terminals as shown in the following diagram.
2. Do not remove the interconnection wires (Jumper1 / Jumper2) on "Backfeed Protection Connector".
Mains
L1 L2 PE
WITH BACKFEED PROTECTION CONFIGURATION
1. Customers should provide an external isolation device (Magnetic Contactor) which is upstream and outside the UPS and capable of supporting the UPS
input current.
2. Remove the interconnection wires (Jumper1 / Jumper2) on "Backfeed Protection Connector".
3. Hardwire the input terminals and "Backfeed Protection Connector" as shown in the following diagram.
4. The external isolation device must be installed in the Mains path.
Mains
L1 L2 PE

BACKFEED PROTECTION

Jumper1
Jumper2
A1
L1 L1
MC
L2 L2
A2
2A Fuse
(Slow Blow)
UPS
I/P
L1 L1 L1
EMI
L2 L2 L2
PE
1
2
Backfeed
3
4
5
UPS
I/P
L1 L1 L1
EMI
L2 L2 L2
PE
1
2
Backfeed
3
4
5
9
Copyright © 2017 Cyber Power Systems, Inc.
IP-L1
IP-L2
PSDR
AC-L1
AC-L2
IP-L1
IP-L2
PSDR
AC-L1
AC-L2