ABB IS-limiter - Switching the Tripping Device ON; Panel Operation and Connection

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6.1.2 Start-up
• Comply with all relevant safety regulations.
• Ensure that the circuit-breakers and switch
disconnectors in series with the I
s
-limiter
TM
are in the off position
• Remove any existing earthing and
short- circuiting connections in the critical
switching area
• Connect the switchgear step by step,
observing the signals and indicators
• Check that the relevant conductors are
in phase, as far as necessary when several
incoming feeder cables and switchgear
sections are concerned
• Carry out all measurements and check all
functions dependent on the high-voltage
power supply being connected
• Watch out for irregularities of any kind
6.2 Switching the tripping
device ON
• Switch the MCB for the AC and DC power
supply ON
• Switch the main switch on the power unit ON
• The indicator relay for the monitoring system
will pick up and the "I
s
-limiter
TM
not ready"
signal is cancelled
Any closing lock-outs with the circuit-breakers or
switch disconnectors in series are enabled.
6.3 Switching operation
The tripping device is switched ON and off with
the main switch on the power unit. The MCB
normally remain permanently ON.
Note
If the tripping device is switched ON without
resetting the tripped indication, it has to be
switched off again at the main switch:
Reset the tripped indication after approx.
1 minute, and then turn the main switch ON
again.
CAUTION!
For tripping devices with coupling:
The coupling causes the remaining
phases to trip when at least one
phase has tripped.
If the indication is reset while the main switch is
ON in a device with coupling, this will cause the
I
S
-limiter
TM
inserts to trip and the new inserts
which have been just replaced, will have to be
replaced again!
1. The I
S
-limiter
TM
is then ready for operation.
2. The equipment can be connected, i.e. the
circuit-breaker or switch disconnector can be
closed after any earthing switches have been
switched off.
CAUTION!
Never re-use tripped I
S
-limiter
TM
inserts (green indication),
irrespective of the condition of the
fuse. Repair and testing of
I
S
-limiter
TM
inserts may only be carried
out at ABB (manufacturer's works)!