55
KEOR S 3-10 kVA
Oper
ating & I
nstalla
tion M
anual
During Maintenance Bypass operation; in case of any mains interruption, all loads
on the output will be deenergized. Maintenance Bypass Operation should not be
preferred for long time use.
Warning:
for models 6 and 10kVA with internal insulation transformers, the trans-
former remains live inside the maintenance bypass circuit.
ESD switch should be placed where unauthorized people cannot reach it.
Unauthorized use may cause the load be deenergized.
In order to transfer the loads from Maintenance Bypass to UPS without interruption, do the following in-
struction respectively;
• Switch the output circuit breaker
(Q2)
, the input circuit breaker
(Q1)
, if external battery used; the battery
circuit breaker
(Q3)
and the breakers on external battery cabinet(s)
(F5)
if any- to
“ON”
position.
• Switch the Maintenance Bypass circuit breaker
(Q4)
to
“OFF”
position.
• Make sure UPS operates on Bypass Mode (as drawing B).
• Press the UPS ON Switch for approx. 5 seconds. If there is no problem after the self-test UPS starts to
operates on Online Operation
(norl)
.
• Replace the cover of Maintenance Bypass circuit breaker.
9.6.
Emergency Switching Device (ESD)
UPS output can be cut off immediately by ESD connection if desired. ESD connection is normally open (NO),
i.e. when the ESD connection is closed circuit UPS output cuts off.
In case ESD connection is used in distance; a latched switch can be used as described in below figure. When
UPS operates in Online Operation; the latch switch shall be normally open (NO). Whenever any emergency
occurs you have to make the switch closed to turn the UPS off. Line OFF will be seen on the front panel. In
case you start-up UPS again you have to turn off UPS first.
ON
