8
CPSS Emergency MASTERYS EM
10 to 80 kVA - Ref.: IOMMASELXX03-GB 00
Backfeed protection
If the UPS does not have an automatic protection device against current backfeed, the operator/installer must attach a warning
label to all mains power disconnecting switches installed at a distance from the UPS area. This serves to remind technicians of
the fact that the circuit is connected to a UPS (refer to 'SAFETY STANDARDS' chapter in this manual and paragraph 4.5.3. of the
EN62040-1-1 2003-11 standard).
The label is supplied with the system.
The backfeed protection device may be built into the system (only on specifi c request), or an electromechanical switch may be
installed externally at the UPS input.
• If the UPS has this protection incorporated, proceed with the connections as described in paragraph 2.5 of this manual.
• To install the external backfeed protection it is necessary to use the BKF card and an external electromechanical switch that
should be installed as close as possible to the UPS. For further information on the connection and type of remote switch please
refer to chapter 'STANDARD FEATURES AND OPTIONS'.
WARNING!
The neutral is not disconnected as, even in the event of a single fault on the UPS, it never has high potential when
the mains and/or auxiliary power supplies are disconnected upstream. This is to prevent transformation of the power
source to the UPS every time there is a power failure.
If under certain irregular conditions, or due to the installation upstream (e.g. undetected and protected earth fault, or
high leakage in a phase, or with IT systems) there is a hazardous potential on neutral, a suitable isolating switch must
be provided on the neutral as well, or else there must be a detection, signalling and protection system.
NOTE
For equipment with separate Emergency Mains, it must be possible to make the neutral of the Emergency Mains
line electrically common with the neutral of the main input feed line.
YOUR CONNECTION TO SAFETY
Thiele KG
• V
orderer W
einberg 26 • D-71522 Backnang • T
el.: +49 (0)7191 3560-0
• Fax.: +49 (0)7191 3560-19
• info@thiele-kg.de
• www
.thiele-kg.de
Thiele KG
• V
orderer W
einberg 26 • D-71522 Backnang • T
el.: +49 (0)7191 3560-0
• Fax.: +49 (0)7191 3560-19
• info@thiele-kg.de
• www
.thiele-kg.de
YOUR CONNECTION TO SAFETY
klick to
www
u-s-v
YOUR CONNECTION TO SAFETY
klick to
www
ACDC-DCDC
YOUR CONNECTION TO SAFETY
klick to
www
SYSTEME
YOUR CONNECTION TO SAFETY
klick to
www
CONTACT
YOUR CONNECTION TO SAFETY
klick to
www
CALLBACK