R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
! : (937) 328-5100
FAX: (937) 325-5319
11/31
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
higher the speed
− run commands are controlled separately by
closing the direction switches (S1 and S2)
MS-control requires a 2-4-step controller. The
operation is as follows:
− each step has its own frequency
− the frequencies are freely selectable
− when controller is set to a certain step, the speed
changes to equal value
speed
controller
position
up / fwd
down / rev
time
speed
controller
position
MS-mode
1.8 Mechanical brake control
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. D2H/D2C decelerate 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.
The motors of CXT-hoists and SM-trolleys have an electromechanical disk brake. 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.
2-phase AC
- D2C 002-045F
D2C models 002F-045F include an AC-supply from two phases for the
disk brake control. D2C controls this line and it is protected by an
adjustable circuit breaker (max.4.0A). A rectifier included in the motor
rectifies the AC-voltage to DC-voltage brake coils.
REC12
- D2H 002-011F
D2H models 002F-011F have a built-in REC12 brake control unit, which
is a line voltage half-wave rectifier (max.1.25Adc). 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. An external control unit is
needed to control other brake types.
ESD141
- D2H 015-110F
D2H models 015F-110F have a built-in ESD141 brake control unit,
which is a line voltage full/half-wave rectifier (max.1.25Adc). 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. An
external control unit is needed to control other brake types.
3-phase AC
- D2H 055-110F
- D2C 055-110F
D2H and D2C models 055F-110F include a 3-phase AC-supply for the
brake control. D2H and D2C control 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 D2H and D2C. Only the capacitors must be added
outside D2H and D2C. This connection can also be used to control 2-
phase disk brakes or a separate KA372B brake control unit.
(11 Seiten)
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