Siel 50-200kVA PF-1 UPS, Инструкция по установке и эксплуатации

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IV420E Rev.00 SIEL S.p.A. Installation and user manual
Date of issue: 2019-01-29 Pag. 70 di 72+ FR
Appendix 8 Backfeed Protection
Backfeed Protection
The presence of a backfeed protection is required by IEC 62040-1 UPS standard.
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 to supply the
contactor coil.
Backfeed installation with relay:
1. Connect the UPS backfeed dry contact port to an ex24 VDC supply pole
“
+
”
. Route the
cable with the other signal cables.
2. Connect the UPS backfeed dry contact to a terminal of the relay R coil. Route the cable with the
other signal cables.
3. Connect the terminal of the relay R coil to a +24 VDC supply pole
“
-
”
(M).
4. Connect the fuse F, the auxiliary contact of relay R, and the coil of C as shown in the illustration
below.
5. Connect C (L1, L2 , L3) with UPS output (L1, L2, L3) as shown in the illustration below.
6. Connect bypass input (N) with mains feeding (N) in the distribution.