JVL A/S - User Manual - Integrated Servo Motors MAC050 - 4500 81
2.17 Silent mode
2.17.3 Changing PWM frequency
An additional improvement in noise can also be done by changing the PWM frequency.
This improvement is however, mostly relevant at the larger motor sizes MAC1500 and
up to MAC4500 since they use a PWM frequency at 5kHz as default.
The background noise from 5kHz can be very audible depending on how the motor is
mounted.
The following motors support this feature:
MAC1500, MAC3000 and MAC4500.
In all other motors this feature have no effect.
The PWM frequency can be changed according to following steps.
1. Start writing -7777777 (decimal) to register 204 - SERIAL_NUMBER.
This is a key that opens for the possibility to change the PWM frequency.
2. For changing the PWM to 10kHz write 0x1051 (hexadecimal) to register 211, COM-
MAND_REG.
For changing the PWM to 20kHz write 0x1052 (hexadecimal) to register 211, COM-
MAND_REG.
For changing the PWM back to 5kHz write 0x1050 (hexadecimal) to register 211,
COMMAND_REG.
The PWM frequency setting can not be saved permanent in the motor.
Please note that the power dissipation and thereby the motor temperature
will increase by changing the PWM frequency.
Make sure to run tests in the actual application to be sure that the motor
temperature is kept at a reasonable level in order to avoid too early temper
-
ature errors.
At the moment it is not possible to control the PWM frequency from the JVL MacTalk
program.
!
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