Ready" Lamp; Blocking Magnet -Rl2; Wiring Diagrams For C.b. On Withdrawable; Quenching Principle Of The Vacuum Interrupter - ABB VM1 Manual

VM1 - INSTRUCTION MANUAL BA 504/05 E
8
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3. Function
The function of -MU can on the control module be
deactivated if it is not required. If the function of
-MU is deactivated, the VM1 can be opened and
closed without any voltage being applied.
For the coding of the DIP switches, see figure
9/16a.
• Monitoring of the closing and opening coil of the
actuator
This function monitors the closing and opening
coil of the actuator for cable breakage. If such a
breakage is detected, the "READY" lamp on the
front of he switching device goes out and
corresponding signals (-DR, -DN) are issued.
• Additional contacts for position signalling
An additional pair of NO contacts to signal the ON
and OFF positions are made available by the
controller (-DO2, -DC2).
• Direct opening without microprocessor is
supported
The second opening input -MO2 (in the full version
on the control module) is designed in such a way
that an opening command is executed directly
without being passed through the microprocessor.
3.1.5
• supply of auxiliary power to the VM1 circuit
breaker (see also section 6.2),
• detection of a defined ON or OFF position by the
position sensors,
• monitoring of the controlled function of the
microprocessor – Watchdog,
• sufficient voltage at the capacitor for the next
switching operation (see also section 2.1.2) and
• continuity of the actuator coils 1).
The "READY" lamp does not monitor the status of
inputs -RL1 and -MU1). Therefore, it may happen
that the VM1 will not perform a closing operation
even though "READY" is shining. In that case, the
status of inputs -RL1 and -MU
A flashing "READY" lamp signals recharging of the
capacitor.
Switching readiness is enabled during that time.
This interlock is cancelled by applying the supply
voltage to blocking magnet -RL2 and the READY
contact -DR.
The "READY" lamp monitors the following
conditions:
) has to be checked.
1
3.1.6 Blocking magnet -RL2 (Figure 9/28)
Blocking magnet -RL2 fitted to:
• manually movable VM1 withdrawable parts,
• ZS8.4 withdrawable parts without mechanical
plug connector interlock.
The blocking magnet prevents the withdrawable
part from being moved when no supply voltage is
applied. This interlock is cancelled by applying the
supply voltage to blocking magnet -RL2.
3.2 Wiring diagrams for C.B. on
withdrawable part (Figures
10/10 to 10/13 and 9/15)
• The wiring diagrams, shown in figures 10/10 to
10/13, cover the basic equipment and all the
possible configurations of the various VM1 series.
The scope of equipment which can be installed
within each series is detailed in the relevant
switching device list. The actual equipment
installed in the individual case can be found in the
order documents.
Panel type Plug type
ZS1 , UniGear type ZS1 , 58-pin control
UniSafe, Powerbloc and wiring plug
Mounting frame
ZS8.4 64-pin control
wiring plug
• It is possible to encode the 58-pin control wiring
plug connector to define the assignment of the
breaker withdrawable parts to particular panels.
Impermissible combinations of withdrawable
parts and panels are thus prevented. The possible
encoding of a 58-pin plug is shown in figure 9/15.
3.3 Quenching principle of the
vacuum interrupter
Due to the extremely low static interrupter
chamber pressure of 10 to 10
-4
relatively small contact gap is required to achieve
a high dielectric strength. The vacuum arc is
extinguished on one of the first natural current
zeros.
Due to the small contact gap and the high
conductivity of the metal vapour plasma, the arc
drop voltage, and additionally, due to the short
arcing time, the associated arc energy, are
extremely low, which has advantageous effects on
the life of the contacts and thus on that of the
vacuum interrupters.
1 ) Full version on the control module, optional
Figure no.
10/10
and 1 0/1 1
1 0/1 2
and
1 0/1 3
hPa, only a
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