VC II 230/400-3...15
15
Note:
When setting up a machine or during commissioning, it is possible to carry
out 5 starts or braking operations in succession, i.e., with rated device
current and at a braking time of 10s. After such operating conditions,
however, the device needs a recovery time of 20 minutes.
Adjusting soft start
Turn potentiometer „M“ clockwise so far that, when pressing the ON-key, the motors starts
immediately. In this connection, humming with the motor being at rest is to be avoided.
Adjust potentiometer „t“ so that the requested starting time or starting characteristic is reached.
Note:
To protect the power semiconductors and the motor from excessive heating,
the starting time is to be kept as short as possible. At any rate, the motor
must
have reached its nominal speed before the bypass is activated
(„bypass“-LED is illuminated).
Warning:
If the adjusted acceleration time is too short, the internal bypass contacts
close
before
the motor has reached nominal speed. This can cause damage
to the bypass relays.
Adjusting the braking current
The braking current is to be adjusted to a value as small as possible in order to avoid
unnecessary heating of the power semiconductors and the motor. This is especially important in
the case of high switching frequencies. We recommend to limit the maximum braking current to
2.5 times the rated motor current.
The requested braking torque is to be adjusted with the potentiometer „I". It is important that the
braking current does not exceed the rated device current which is indicated on the rating plate of
the device.
Adjusting the braking time
It is not necessary to make an adjustment, since the braking current is automatically switched off
approx. 1.5s after the motor has come to a standstill.
If during the maximum braking time (10s in the case of standard devices) no standstil is detected,
the braking current will be switched off after this period of time. This is indicated by an opening of
the fault signaling contact. The red „fault“-LED is illuminated.
Caution: Danger to life through electric shock!
Even if the motor is at rest, it is
not
physically separated from the mains.
Summary of Contents for VersiComb II 230-3
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