3.1.4.2 Extended Functions In The Full Version; Ready" Lamp; Blocking Magnet -Rl2; Wiring Diagrams For C.b. On Withdrawable Part - ABB VM1 Instruction Manual

3.1.4.2 Extended functions in the full version

In addition to the functions of the standard version, the full
version contains the following functions:
- Untervoltage release -MU
This input switches the VM1 off if the voltage applied falls
below the tolerance range stipulated in IEC 62271.
The nominal value of the voltage to be monitored is set at the
works in accordance with the specification in the order.
In order to prevent switch-off when the voltage briefly falls
below the specified level (e.g. on motor start-up), a tolerance
time can additionally be set.
If no voltage is applied to -MU, the VM1 cannot be closed
normally. However a closing support function is provided, that
can enable the closing operation even if no voltage is applied
to -MU. If after this closing operation no voltage is applied to
-MU, the VM1 will switch off.
The function of -MU can on the control module be deacti-
vated 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 The "READY" lamp monitors the following conditions:
- 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 -MU . Therefore, it may happen that the VM1 will not per-
1)
form 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 mag-
net -RL2 and the READY contact -DR.
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 connec-
tor 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 configura-
tions 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
ZS1, UniGear type ZS1,
UniSafe, Powerbloc and
Mounting frame
ZS8.4
- It is possible to encode the 58-pin control wiring plug con-
nector to define the assignment of the breaker withdraw-
able 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 hPa, only a relatively small contact gap is
-4 -8
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.
Full version on the control module, optional
1)
Instruction manual 504/05 | VM1 Vacuum circuit-breaker 9
. has to be checked.
1)
Plug type Figure no.
58-pin control 10/10
wiring plug and
10/11
64-pin control 10/12
wiring plug and
10/13