Gu Brake Rectifiers (Normal Excitation); Se Current Relays (Motor Current-Dependent High-Speed Trip Relay); Ve Voltage Relays (Voltage-Dependent High-Speed Trip Relay) - DEMAG ZBA Assembly Instructions Manual

5.1.5 GU brake rectifiers (normal
excitation)
5.1.6 SE current relays (motor
current-dependent high-speed
trip relay)
5.1.7 VE voltage relays (voltage-
dependent high-speed trip
relay)
16
GU brake rectifiers can be used as an option for brakes with a separate AC power
supply up to brake size B050.
They are fitted in the brake motor terminal box as standard, but can also be
alternatively used in a switchgear cabinet. The brake coil then has to be protected
in the motor terminal box against cut-off voltage peaks by a varistor.
The brake rectifier is controlled direct by means of a 24 V/DC switching signal from
an installation or a frequency inverter.
The brake is switched on and off in the DC circuit, which enables a short brake
application time to be achieved.
It is not necessary to control the brake via the AC power supply of the module with
the associated additional cabling and wiring requirement.
The brake application times correspond to those for switch-off in the DC circuit via
a contact.
SE current relays can be combined with GE, GS and GP brake rectifiers. They
are used for rapid demagnetization of the brake to achieve fast brake application
times without the need for additional wiring for brake switch-off in the DC circuit.
SE current relays are connected to one motor current phase. When the motor is
switched off, the relay demagnetizes the brake by opening the contact in the DC
circuit. SE current relays can be used for rated motor currents up to 50 A.
IMPORTANT. Operation together with inverters is not permitted. We recommend
i
the use of VE voltage relays for these applications.
SE modules must not be used in the delta jumper for single-speed motors.
If the brake is to be released without motor current, it is also recommended that
the VE module be used instead of the SE.
NOTE. The grey and white connecting cables of the SE module must be
i
connected to terminals 3 and 4 of the GE, GS or GP modules with the correct
assignment.
VE voltage relays can be combined with GE, GS and GP brake rectifiers. In
contrast to SE current relays, VE voltage relays must only be used for brakes with
a separate power supply. These modules can preferably be used for inverter-fed
motors and for brake release without motor current. They are used for high-speed
demagnetization of the brake to achieve fast brake application times without the
need for additional wiring for brake switch-off in the DC circuit. VE voltage relays
are connected to the brake power supply. The contact in the DC circuit is opened
when the brake is switched off.
NOTE. The red, blue and white connecting cables of the VE module must be
i
connected to terminals 1, 3 and 4 of the GE or GS modules with the correct
assignment.
GE and VE brake modules should be used for separate AC power supply for the
brake in combination with ZBF motors.