PMC-2 Instruction Manual
Page 36 BA * PMC-2 * EN * 01/98
DC-circuit short circuit
With this drive a high safety at standstill of the drive is achieved with little expenditure. The
monitorings installed in the drive system are most effectively used.
In cases of EMERGENCY STOP, enable LOW and severe PMC-2 errors the mains contactor will
drop and the DC-circuit short circuit contactor will fall-in after a deceleration time (parameter P0.16).
The DC-circuit is then discharged by means of a power resistor. Therefore the motors are always
stopped in braked manner.
• The DC-circuit short circuit is active for at least 250 ms in order to guarantee a complete discharge
of the DC-circuit.
• The power resistor must come to at least 10 Ω. A power resistor BM-1 or BM-2 for single units in
the size of the bleeder is recommended (see Technical Data). With a parallel connection of the
DC-circuits a BM-2 with 10 Ω (article no. 13270010) is recommended.
• The contactor K3 must be designed for the peak discharge current; its two normally-closed
contacts have to be switched in series.
Type Telemecanique LP1-D 25008 / 24 V (article no: 17189003-002) or LC1-D25008 / 230 V (article
no. 17189003-001) are recommended.
Additional capacities on the DC-circuit
Due to additional capacities the energy stored will be increased in the DC-circuit.
• At stations in which it is accelerated and braked again shortly one after another, this could be
necessary in order to reduce the bleeder’s continuous operation and thus the heat loss.
• At stations at which the motor has to finish its movement after cessation of the power supply, the
condensator module can supply the required energy.
For units up to 8A nominal power the condensator module KM-1 is available.
CAUTION
When using additional capacities on the DC-circuit please contact our
application department.
Bridges of the DC-circuit
With multiple axes applications the DC-circuits of the single PMC-2s can be bridged for energy
exchange.
For this purpose the PMC-2s are coupled via the DC-bus. In doing so the terminal BLO has to be
bridged between all units as well as the mains feeder L1, L2, and L3. The drive of the joint mains
contactor is via series connection of the relay outputs A_mains contactor of the parallelly switched
units. Each unit can have its own bleeder or all units can have a joint bleeder. It is driven to the LED
„BLO“ on all units.
CAUTION
• four PMC-2s max. can parallelly be switched
• the mains feed is on the appliance with the highest performance
• the DC-circuit short circuit is on the appliance with the highest performance
• with a common bleeder, the bleeder is connected to the appliance with the
highest performance
• on appliances without an external bleeder the parameter P0.25 bleeder
must be set to „no“
CAUTION
BLO, DC+ and DC- must all be bridged in any case
(e.g. only mains and BLO is not allowed)
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