Installation, Operation, & Maintenance
16
MMC Hardware Manual
G & L Motion Control Inc.
It is recommended that the same main disconnect switch be used
for the MMC system and for all devices in the application.
3.4.4
Grounding the System
The ground of the MMC power source must be connected directly
to a
Single Point Ground
(SPG) tie block. The tie block should be
made of brass or copper, bolted or brazed to the control cabinet. If
the tie block is bolted rather than brazed, scrape away paint or
grease at the point of contact. Put star washers between the tie
block and the cabinet to ensure good electrical contact.
Metal enclosures of power supplies, drives, etc., should also have
good electrical contact with the SPG.
Devices to be connected directly to the Single Point Ground
include:
•
Plant safety ground.
•
Chassis ground from MMC power connector.
•
The metal panel or cabinet on which the MMC is mounted.
•
“Common” or “0 V” lines from power supplies that provide
external power to the I/O modules and the devices to which
they are connected.
•
Chassis grounds from the devices themselves, such as
device drivers, machinery, and operator interface devices.
IMPORTANT
No matter how the system is installed, before you con-
nect the MMC to the application, make sure that power
is off to the system and to the devices that are wired to the
MMC.
CAUTION
The Single Point Ground should be the only common
point for all the ground lines. If not, ground loops may
cause current flow among components of the system
which can interfere with proper operation of the MMC.
Summary of Contents for MMC-A2
Page 1: ...Standalone MMC TM Hardware Manual Version 15 0 G L Motion Control Inc...
Page 2: ......
Page 36: ...Installation Operation Maintenance 28 MMC Hardware Manual G L Motion Control Inc...
Page 124: ...Standalone Digital MMC Control 116 MMC Hardware Manual G L Motion Control Inc...
Page 136: ...MMC Ethernet TCP IP Option Module 128 MMC Hardware Manual G L Motion Control Inc...
Page 175: ...CE and EMC Guidelines G L Motion Control Inc MMC Hardware Manual 167...
Page 176: ...CE and EMC Guidelines 168 MMC Hardware Manual G L Motion Control Inc...
Page 177: ...CE and EMC Guidelines G L Motion Control Inc MMC Hardware Manual 169...
Page 178: ...CE and EMC Guidelines 170 MMC Hardware Manual G L Motion Control Inc...
Page 186: ...Appendix A Operation Details 178 MMC Hardware Manual G L Motion Control Inc...