Operating instructions
Mechanical installation
Page 28 of 35
Rotary indexer RTX
Version 1.0.0
The acceleration and deceleration time of the motor depends on many parameters and especially on how the motor
and the brake are controlled. As a result, the start-up time or the stopping time of the motor can vary greatly. If the
motor is not optimally controlled, the stopping time can be so high that the motor can no longer stop in the cogging
range and overruns the cogging range.
Fig. 12 Start-up and stopping time of the motor
To ensure optimum operation of rotary indexer, the following points should be taken into account when controlling
the drive:
1.
The reaction to the sensor signal should be immediately.
a.
It is recommended to use the sensor signal directly for controlling the mains contactor for motor and brake.
This avoids the time delay caused by the evaluation of the sensor signal by the electronic devices or PLC.
b.
If the sensor signal has to be processed in the PLC, then the PLC should be programmed and configured in
such a way that the reaction time to the sensor signal for motor stop can be kept as short as possible.
c.
The time delays of the sensor signal can occur when the sensor is connected to sensor boxes, intelligent
terminals, distribution boxes, bus systems or similar.
2.
Control and wiring of the brake
a.
Do not connect the brake with AC voltage directly to the terminal board, as this will delay the application
of the brake.
b.
When using the brake with AC voltage, the brake should be switched off simultaneously on the AC and DC
sides. This type of disconnection provides faster brake application in comparison with disconnection on the
AC side. How to control the brake so that the shortest braking time can be achieved, contact the motor
manufacturer in this regard.
c.
The brake control components, such as relays, should be used with the fast response time.
d.
The wiring of the brake should be done by qualified personnel in any case. It is essential to observe the
instruction leaflets enclosed with the motor.
e.
Check the wear of the brake and readjust it. Over time, wear on the brake increases the stopping time,
which can lead to the motor overrunning the cogging range.
3.
EMC guidelines must be observed when connecting the motor, brake and laying cables.
4.
When operating the motor on TIC, the sensor should be connected directly to the TIC. The sensor signal is sent
directly via field bus to PLC.
Cogging range
overrun
Immediate reaction to
sensor signal
Delayed reaction to
sensor signal
