Arkel ADrive Size-B - Mechanical Brake Connection

ARKEL Elektrik Elektronik Ltd. Şti. www.arkel.com.tr
08.2012
ADrive
25
Recommended mechanical brake connection:
A
ccording to EN 81-1, disconnection of the mechanical brake coils from electrical current mu
s
b
e ensured by at least two contactors. The main-contactors disconnecting the motor current
m
ay be used for this purpose also.
Recommended mechanical brake connection is shown below:
The main contactors (KPA and KPB) must be used to disconnect the DC supply of the mechanical
brake. On the other hand, the brake contactor must be used to disconnect the AC supply.
Disconnecting the DC supply directly while AC supply is still connected will cause arcs on the
contact plates and will shorten the lifetime of the contacts. For that reason, the contacts on DC
circuit must only be opened after the AC supply is cut-off. This will ensure that the contacts will
only be used to disconnect the mechanical brake supply only in emergency situations.
Only the main terminals (not auxillary terminals) of the contactors must be used in the
mechanical brake circuit.
A suitable varistor must be used to filter the instantaneous high-voltage peaks on the
brake coil.
L
N
L
N
KFR: Mechanical brake contactor
KPA, KPB: Motor contactors
ADri
ve