Structure Of The Control Module - ABB VM1 Installation And Service Instructions Manual

6.4. Structure of the control module

The control module consists of a single circuit board. This
board contains a series of components:
• AC/DC converter
• Logic circuit / Power Electronics
• Electric optoccouplers for input
• Relays for output
The board is connected by a plug connector which ensures
safe and trouble-free wiring. The boards and components are
not user serviceable.
Storage capacitor
The energy for operation of the circuit-breaker is stored
electrically in a capacitor. This capacitor is designed in such a
way that when fully charged, the energy for an O-(0.3 sec.)-
C-O* operating sequence is available without recharging.
The energy stored by the capacitor is continuously monitored.
This is achieved by measuring the capacitor voltage.
The "READY" lamp indicates whether the circuit-breaker is
functional or not, and indicates if the circuit-breaker is ready
or not ready to operate.
obSeRve ConneCting the auxiliaRy
voltage aS deSCRibed in the oPeRation,
inStallation, and MaintenanCe SeCtion.
note
The energy available in relation to the relevant switch position
is the criteria which determines
• Case 1: Circuit-breaker in the OPEN position
The energy available is sufficient for an CLOSE and OPEN
switching operation.
• Case 2: Circuit-breaker in the CLOSED position
– The energy available is sufficient for a OPEN-CLOSE-
OPEN switching sequence.
– The energy available is sufficient for an OPEN switching
operation up to 200 seconds after failure of the auxiliary
power supply.
* O-C-O is operation duty Open - Close - Open.
Position sensors
The use of two inductive proximity sensors (10 Fig. 11) allows
the state of the circuit-breaker (open - closed - anomalous
intermediate position) to be determined without the use
of auxiliary contacts, allowing continual monitoring of the
system.
The signal of the two sensors is sent to the electronic control
module.
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