Hello Community,
I am using a B&R XEPIMC200.02 module.
On terminal X17, I configured the output as PWM in current mode (PWM + counter combination terminal). The output current range is 3 A.
I am facing current fluctuation/instability on the PWM output. The output current is not stable and does not behave linearly with the PulseWidthCurrent value.
Current Configuration:
PWM mode: Current mode
Decay mode: Slow decay
Pulse width and period duration values are written through I/O mapping variables
Dither amplitude and dither frequency configured according to the formula provided in the B&R Help documentation
I referred to the dither calculation example as mentioned in help (Help GUI ID- 742c939d-17c7-49a1-81e9-7f26d8bd39c8) to configure a proportional relief valve:
Valve Model: - RZMO-A-010/50/18/MC
Valve Parameters:
Nominal valve current = 1.5 A
Valve dither frequency = 200 Hz
Using the formula from the documentation:
Dither amplitude:
(27 / 2) × (1.5 / 3) × 10 = 67.5
Dither frequency:
200 Hz / 2 Hz = 100
Configured values:
Dither amplitude = 68
Dither frequency = 100
Decay mode = Slow decay
I tested different configurations including: - PulseWidthCurrent values
: - PeriodDuration values
: - Dither amplitude/frequency settings
: - Different decay configurations
However, the output current still fluctuates and is not stable.
Thanks in advance!