59
L20, L30
12.
Appendix 7: Backfeed protection port definition
12.1.
Port definition
Figure 39 Backfeed port
Table 21 Interface definition
UPS
Instruction
Function
Definition
Pin1/Pin2
Normally NO
Bypass Backfeed Port
Drive the bypass breaker when
Bypass Backfeed alarm.
Pin3/Pin4
Normally NO
Mains Backfeed Port
•
Drive the mains breaker
when Mains Backfeed
alarm.
12.2.
Function description
An additional external isolation device must be installed upstream the UPS system. A
magnetic contactor or a circuit breaker with UVR (Under Voltage Release) functionality can
be used for this purpose.
The isolation device must be able to carry the UPS input current (common input in case of
single source, bypass input in case of dual source).
E.g. an isolation device can be a magnetic contactor. The coil of the contactor should be
supplied by (eg. fused L1-N voltage) the input source in single mains configurations or by
the bypass source in dual mains configurations, via the output port as per Appendix 6.
If the contactor coil exceeds the voltage/current limits of the UPS output port a 24 Vcc
source should be generated from the same source the contactor coil is supplied from, in
order to supply an additional external auxiliary relay coil. The relay contact, properly rated,
should allow supplying the contactor coil.
Summary of Contents for L20-IB60, L20-IB00
Page 2: ......
Page 17: ...9 L20 L30 Figure 5 Install covers...
Page 27: ...19 L20 L30 5 5 Cabinet view Figure 15 Front view Side view of L20 and L30...
Page 31: ...23 L20 L30 5 7 Electrical Diagrams Figure 19 Remote EPO NO and NC port...
Page 32: ...24 L20 L30 Figure 20 External maintenance bypass auxiliary contacts...
