RMS Technologies IMD23 W/ POLE DAMPING TECHNOLOGY - Manual (Page 16)

RMS Technologies Page 16 Version 1.10
IMD23/23DE Manual 12/3/2007
Hold Current
The motor changes from run current to hold current 2.25 seconds after the motor stops
stepping. Four percentage selections are available for hold current. It is a percentage of
the selected run current.
HOLD CUR 0 HOLD CUR 1 Holding %
OFF OFF 0%
ON OFF 25%
OFF ON 50%
ON ON 100%
Damping
A total of four damping modes are provided in order to aid in resonance and vibration within
the motor. This is also known as mixed decay. The current waveform is dampened to
create a smoother motion profile. The most effective damping mode is motor dependent.
DAMPING 0 DAMPING 1 Decay type
OFF OFF Fast decay
ON OFF 17% mixed decay
OFF ON 37% mixed decay
ON ON Slow decay
Generally speaking, applications that run at slow speeds are recommended to use a
damping factor of 17% or “fast decay”. Fast speeds should use a damping mode of 37% or
“slow decay”. Since the best value is dependent on the motor winding, loads, power supply
voltage, and other factors, it is best to use an oscilloscope and a current probe device to
view the current waveform and try different PF values. The following examples show good
and bad waveforms when choosing different PF values.
• PF value 1
• Slow speeds
• Good waveform