FAST BRAKE ACTION IS ESSENTIAL
FOR HOIST APPLICATIONS
The voltage VB must be applied and removed at the
same time as the power to the motor.
- Voltage to the rectifier energizes the brake coil and
releases the brake.
- Removal of the voltage VB de-energizes the brake
coil and allows the brake to be applied.
The AC voltage VB will be rectified to a DC level of 50%
of the AC voltage applied.
manufactured with totally enclosed fan cooled squirrel
continuous operation under difficult conditions. The
windings are protected with a special Insulating material
Class B equivalent or better. The brake motors
incorporate a DC disc brake and the supply is taken
from a half-wave rectifier mounted inside the motor
Motor Winding Connections
For voltages other than 2301460V, 60HZ; check decal in
BRAKE COIL VOLTAGES
Motors with dual voltage connections: 230/460V, 60HZ
will be supplied with a 230V brake coil. In each case,
whether the motor voltage is 230 or 460 VAC, the brake
rectifier is connected to T7-T8 where 230VAC will be
tapped oft the terminal block.
See motor connection diagram number 5 for 460VAC,
60HZ and number 6 for 230VAC, 60HZ power supplies.
For Brake Motors Operating On: 200V/208V, 575V,
60HZ or 220/380V, 415V, 50HZ, the above does not
apply. In all cases the brakes will be connected for the
requested operating voltage.
The only maintenance, normally, required is to ensure
that the area between the cooling fins and the area
through which the air is drawn in the fan guard is kept
clean and that an audible check is made on the
bearings. If the motor is being overhauled the bearings
must be cleaned and repacked. If the motor has to
operate in moist or wet surroundings then it is very
important that on reassembly of the motor the end
shield tenons are coated with a sealing compound such
successfully under the following conditions of voltage
accordance with the standards established for operating
under rated conditions:
a. When the variation in voltage does not exceed 10%
above or below normal, with all phases balanced.
b. When the variation in frequency does not exceed 5%
above or below normal.
c. When the sum of the voltage and frequency
variations does not exceed 10% above or below normal
(provided the frequency variation does not exceed 5%).