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The label will bear the following or an equivalent text:
for example a contactor, which will prevent the appearance of
voltage or dangerous energy in the input mains during a mains
fault (see figure 21 and respect the wiring diagram of «Backfeed
protection» depending if the equipment is with single or three
phase input).
There can be no derivation in the line that goes from the
«Backfeed protection» to the UPS, as the standard
safety would be infringed.
• Warning labels should be placed on all primary power switches
installed in places away from the device to alert the electrical
maintenance personnel of the presence of a UPS in the circuit.
Bypass
«Automatic backfeed protection system»
bypass input, external to the UPS
(EN-IEC 62040-1).
R
S
T
N
Before working on this circuit.
- Isolate Uninterruptible Power System (UPS).
- Then check for Hazardous Voltage between all terminals including the protective earth.
Risk of Voltage Backfeed.
Bypass
«Automatic backfeed protection system»
bypass input, external to the UPS
(EN-IEC 62040-1).
R
Output
input
U
V
W
N
SAI
R
S
T
N
Output
N
U
Input
SAI
N
R
S
T
N
«Automatic backfeed protection system»
input, external to the UPS
(EN-IEC 62040-1).
«Automatic backfeed protection system»
input, external to the UPS
(EN-IEC 62040-1).
Three phase input / three phase output configuration.
Bypass
Three phase input / single phase output configuration.
«Automatic backfeed protection system»
bypass input, external to the UPS
(EN-IEC 62040-1).
Bypass
R
Output
N
«Automatic backfeed protection system»
bypass input, external to the UPS
(EN-IEC 62040-1).
R
S
T
N
Output
U
Input
SAI
Input
U
V
W
N
SAI
N
R
R
N
N
«Automatic backfeed protection system»
input, external to the UPS
(EN-IEC 62040-1).
Single phase input / single phase output configuration.
«Automatic backfeed protection system»
input, external to the UPS
(EN-IEC 62040-1).
Single phase input / three phase output configuration.
Fig. 21. Block diagram for the «Backfeed protection» aplication, for the different configurations.
SALICRU
21