ABB VM1/A/P, Инструкция по установке и обслуживанию

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M ED I U M VO LTAG E P R O D U C T S 23 23
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.
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.
NOTE
Observe connecting the auxiliary voltage as
described in the operation, installation, and
maintenance section.