Standalone MMC Hardware Manual
23
Danaher Motion
version 15.1
Installation, Operation, & Maintenance
Figure 3-4: Example of 24 VDC Power Distribution to an MMC System
The DC power source is connected to the MMC system through a 3-pin connector. It
plugs into the power connector of the MMC. The ground from the power source and
ground from the MMC must be connected to the Single-Point Ground (SPG).
Devices connected to the hardware may have their own power sources for input data
or output control signals. You can use other wiring setups, provided that each one is:
•
at the correct voltage and current levels for the module and the device.
•
connected to the same Single-Point Ground that the MMC uses.
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.
IMPORTANT
No matter how the system is installed, before you connect the MMC to the
application, make sure that power is off to the system and to the devices that
are wired to the MMC.
MAIN
DISCONNECT
AC
PLANT GROUND
+24V
COM
MMC
Analog
+24V
COM Motor
Power
L1
L2
GND
EXTERNAL
24VDC
POWER SUPPLY
+
SINGLE POINT
GROUND (SPG)
GROUND from another
CONTROL CABINET
CHASSIS
GROUND
Interfaced
MMC-SD Drive
Summary of Contents for Standalone MMC
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