Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
95
Appendix
D
Integrated Protective Maintenance Grounding
Device
Overview
The Integrated Protective Maintenance Grounding device (IPMG) is an
optional feature that provides an over-center, spring loaded, snap action
device that provides a low impedance grounding path for all load connections
on CENTERLINE™ Bulletin 1500/1900 medium voltage motor controllers. The
IPMG device can make and withstand short-circuit currents within its
capabilities, from both feeding directions within the motor controller, without
any latching mechanism. It is applied to safely ground/earth the load
connections to three-phase motors, power transformers, and power capacitors
ensuring that no harmful voltages are left or become present on the load
connections before maintenance personnel enter the motor controller or
service the equipment at the end of the load cable connections.
Figure 83 - Typical Controller Single Line showing the optional IPMG
90
Main Power and Ground Bus
Mechani
cal Interlock
IS
R/E Type
GFCT (x1)
CT (
x3)
T1, T2, T3 Motor Terminals
Manual Procedure to Close
IPMG