Elmo SERVO AMPLIFIER DBP SERIES - Manual (Page 69)

68
DBP - Rev 6/93
Guide lines for connecting non-isolated AC supplies
Ground:
Control common
Motor chassis
Amplifier's heatsink
Do not ground:
Power common
(The power common is a hot point and any grounding will cause an input
rectifier failure).
Caution:
- If source of motor command is grounded, use amplifier's differential input.
Otherwise, a ground loop is created.