Control Scheme - ABB VM1 Installation And Service Instructions Manual

6.8. Control scheme

VM1/A/P circuit-breakers are similar in switching con-trol to
standard spring stored energy mechanisms as indicated by
the Sequence of Operation in Chart 1.
Notes for Chart 1: Once the capacitor(s) is(are) charged
(<10amps), the control power will experience a constant drain
of approximately 2mA in lieu of a typical motor circuit of a
spring stored energy mechanism requiring impulse currents
up to 20amps.
Control Power
Capacitor Stored Energy
Connect Spring
Closing Coil
Open Coil
Circuit-breaker
Chart 1: Sequence of operation (not to scale)
24
Available to charge
Closing signal allowed
Capacitors fully charged
Start of closing operation
Closing operation complete
Small voltage drop across capacitor
Compression springs charged
Closing Time
The capacitor voltage will vary 5 to 10Vdc during switching
operations allowing for fast recharge and reclose schemes.
The opening and closing coils are operated via the storage
capacitor(s) and thus only require a minimal signal (24V min)
to operate. The nominal circuit-breaker closing and opening
times are typical at 55ms and 65ms respectively.
note: Sample drawing for actual draft manual.
Start of opening operation
Compression springs discharged
Open operation complete
Opening Time
ON
Constant
2 mA
OFF
Charged
60 V
< 80 V
Discharged
Charged
Discharged
ON
OFF
ON
OFF
ON
OFF