page 24 of 29
Duplomatic MS
S.p.A
. ▪
EDM-M*/30 Start-
up Manual ▪
89251/218
ETM ▪
Jun 2018
PWM
Command
Parameters
Unit
User Level/Group
Default
PWM
70-500
Hz
USR / M1-M2
According with
ordered code
PWM1
PWM2
70-500
Hz
USR / M3
According with
ordered code
The frequency can be changed between 70 and 500 Hz step less. The optimum frequency
depends on the valve type.
DITHER_AMP, DITHER_FREQ
Command
Parameters
Unit
User Level/Group
Default
DITHER_AMP
DITHER_FREQ
0-15
0-PWM/2
%
Hz
USR / M1-M2
0
DITHER1_AMP
DITHER1_FREQ
DITHER2_AMP
DITHER2_FREQ
0-15
0-PWM1/2
0-15
0-PWM2/2
%
Hz
%
Hz
USR / M3
0
The dither can be defined freely with these commands. Different amplitudes or frequencies
may be required depending on the valve type. The dither amplitude is defined in % of the
nominal current (see: CURRENT command).
The upper limit for Dither frequency is half of PWM frequency selected.
