12
BR 230/400-10...400
3. When using braking devices with separate braking contactors (devices with rated currents
from 40A up), braking contactor and motor contactor have to be interlocked against each
other. (Electrical interlock with break contact)
11.3 Commissioning
Sequence of commissioning:
1. Disconnect plant from supply mains.
2. Connect current measuring instrument to the supply line from the braking device to the
motor. The adjustment of the braking current (r.m.s. value) requires a moving-iron
instrument. Do not use clamp-on probes or moving-coil instruments. The true r.m.s. value
is to be measured by using a current probe.
3. Turn potentiometer "t" to right stop (maximum).
4. Turn potentiometer "I" to left stop (minimum).
5. Switch on the plant.
6. Initiate braking by switching the motor contactor ON/OFF.
Note:
When putting the device into operation for the first time, the braking current
should be checked with a true r.m.s. measuring instrument. Clamp-on
probes or digital multimeters may only be used if they can measure the true
r.m.s..
Adjusting the braking current
Adjust the braking current 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 frequent
operation. We recommend to limit the maximum braking current to double rated motor current.
The required braking torque is to be adjusted with the potentiometer "I". It is important that the
braking current does not exceed the rated device current that is indicated on the nameplate of the
device.
If the braking current is adjusted to a too high value, the braking devices will be switched off
immediately.
Warning note:
The devices do
not
have a current control or overcurrent cut-off function.
If the potentiometer “I“ is turned up to an accordingly high level, the braking
current may be higher than the rated device current and can thus destroy the
braking device.
If, due to non-compliance with the above adjustment instructions, the current has been set to a
too high value, it may happen that in the case of devices up to 20A the braking current will be
switched off after approx. 0.5s.
In the event, adjust the braking current “I“ downwards so that the required braking time is reached
again.
