It's likely the motor can handle 18 VDC.

I have two 27V 5.6A power supplies from a previous project so 24V servos
would have been ideal but unfortunately not possible, have to use 12V
servos. The current at 12V, rated RPM and maximum torque is 2.3A. I'm going
to test the performance of the motors with the 27V PS under real mechanical
load using a 6 ohm 40W series resistor.

"Richard J Kinch" wrote in message
.. .
oparr writes:

Anybody using a G320 drive with a 12V servo motor? How risky is this?
G320 specs state 18V as minimum voltage and voltage should not exceed
motor rated voltage by more than 5V. Would forward/reversed biased
diodes in parallel connected in series with each armature lead be wise
or not necessary?

It's likely the motor can handle 18 VDC.

Note that DC motor voltage is related to speed. You can also limit the DC
voltage to the motor by limiting the RPMs in software.