R&M Materials Handling VARIABLE SPEED CONTROLS ControlMaster Plus Service Manual - Manual (Page 11)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
11/83 R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
1.6.3 MS4-control
c_coms4b
A. Controller position
B. Speed
0) “decelerate to zero”
1) step 1 “drive minimum speed”
2) step 2 “drive speed2”
3) step 3 “drive speed3”
4) step 4 “drive maximum speed”
1.7 Mechanical brake control
Inverter has a brake contactor to control electromechanical disk brake of hoisting motor. The disk brake is
opened and kept open during run by DC-voltage. When there is no voltage present the brake is closed and also
kept closed by spring force.
The brake is controlled so that during starting the motor first generates torque and after that the brake is opened.
The same applies for stopping; while the brake is being closed, the motor still generates torque. During a direction
change, the brake is kept open all the time. Inverter decelerates the motor to a stop according to the set
deceleration time when the run command is switched off, so the brake is used only as a holding brake. This way
brake wear is minimized. Only if a failure occurs or the emergency stop button is pushed, the brake closes
immediately stopping the motor and the load.
Models 002F-011F have a built-in REC12 brake control unit, which is a line voltage half-wave rectifier. The half-
wave type rectifier reduces losses and is enough to open the brake. There is a contactor to switch the line voltage
on and off.
Models 015F-055F have a built-in ESD141 brake control unit, which is a line voltage full/half-wave rectifier. Full-
wave rectification is used to open the brake quickly. Then, the rectifier changes to a half-wave type, which reduces
losses, but is enough to keep the brake open. There is a contactor to switch the line voltage on and off. The same
contactor also disconnects the DC-voltage directly from the brake coil, which guarantees that the brake closes fast.
Model 055F includes a 3-phase AC-supply for the brake control. Inverter controls this line and it is protected by an
adjustable circuit breaker (max. 4.0A). When a shoe brake is used, brake closing is speeded up by capacitors.
They are connected in parallel with the brake via the brake contactor NC-contacts. The connection is partially ready
in inverter. Only the capacitors must be added outside inverter. This connection can also be used to control 2-
phase disk brakes or a separate KA372B brake control unit.
1.8 EMC
The abbreviated "EMC" stands for the Electromagnetic Compatibility. According to the European EMC directive
"the apparatus shall be so constructed that:
The electromagnetic disturbance it generates does not exceed a level allowing other apparatus to operate as
intended