Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 73)

Installation and Hookup 4-31
Publication 999-122 - January 1997
Connect the AC Power
The IMC-S/23x requires 3 Amperes (maximum) at 90 - 132 or 175 -
264 Volts AC (auto switching), 47 - 63 Hz, single-phase. This is
compatible with the AC mains power in all countries. Connect AC
power to the AC power input (four position) terminal block on the right
side of the IMC-S/23x as shown below.
The IMC-23x requires that the earth ground terminal be connected to
earth ground for proper operation. The internal noise filtering circuitry
does not work properly without this connection and erratic or unreliable
operation of the unit can result.
!
ATTENTION: The IMC-S/23x must be connected
to earth ground as shown above for proper operation.