Peter electronic VB 230-25LT, Инструкции по сборке и пусконаладке

Страница: 14 / 26

VB230/400-6/25/30LT 13
11.3 Parameter settings
Sequence of steps during commissioning:
1. Disconnect the plant/system from the supply mains.
2. Adjust the requested braking current with the potentiometer „I“ (approx. 2 times the rated
motor current).
Since the potentiometer reacts roughly linear, it is possible to infer the braking current from
the potentiometer setting.
Left stop roughly equals 10% of the rated device current.
Mid-position roughly equals 50% of the rated device current.
Right stop equals 100% of the rated device current.
The braking current can be measured with a clamp-on ammeter (True RMS) or a
corresponding moving iron amperemeter at the output terminal "4T2" of the braking device
3. Adjust potentiometer „T“ to approx. 50% (this is equivalent to a braking time of approx. 15s
/30s in the case of SO2 or SO3).
4. Switch on the plant.
5. Initiate braking by switching the motor ON/OFF.
Note: When putting the device into operation for the first time, the braking current
can be checked with a true r.m.s. measuring instrument.
Adjusting the braking current
The braking current is to be adjusted so that the motor comes to a standstill within the time
requested. In this connection, the braking current must not exceed 2,5 times the rated motor
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 motor. This is especially important in the
case of high switching frequencies.
Adjusting the braking time
The time should be adjusted to a value so theat the braking current still flows for 2s after the
motor has come to a standstill. The optimum setting is to be determined by means of several
braking operations.
Note: If 5 braking operations are triggered in direct succession, it is possible that
the braking device goes into interlocked state due to overloading (i.e., the
motor cannot be started, the „Ready“ LED flashes 3x). In this event, a mains
reset is required and sufficient cooling time (at least 15 minutes) to be waited
out.
Note: If braking times exceeding 20s are adjusted, the permissible maximum rated
device current decreases. In this case, the value indicated on the rating plate
is then not reached any more (see diagram on under point 7).