User`s manual

2-22 Motion Mate™ DSM314 for Series 90™-30 PLCs User's Manual – January 2001 GFK-1742A
2
Grounding the Motion Mate DSM314 Motion System
The DSM314 System must be properly grounded. Many problems occur simply because this
practice is not followed. To properly ground your Motion Mate DSM314 system, you should
follow these guidelines:
The grounding resistance of the system ground should be 100 ohms or less (class 3 grounding).
The DSM314 faceplate shield ground wire (shipped with the module) must be connected from
the ¼ inch blade terminal at the bottom of the module to a panel frame ground.
If an axis terminal board is used, two shield (“S”) connections are provided and one of these
must be connected to a panel frame ground.
The system ground cable must have sufficient cross-sectional area to safely carry the
accidental current flow into the system ground when an accident such as a short circuit occurs.
Typically, it must have at minimum the cross-sectional area of the AC power cable. Figure 2-
15 illustrates the grounding systems.
The amplifier ground connections, power earth (PE) connections, and motor frame ground
connections should always be wired to conform to local electrical wiring regulations. When
installing in conformance to CE Mark directives, a grounding bar and clamp(s) (ordered
separately) is required for the terminal block to amplifier cable. Refer to Chapter 3, Installing
and Wiring the DSM314, I/O Cable Grounding section, for more details.
Power
Magnetics
Cabinet
Series 90*30
P
LC
R
ack
Power
Magnetics
Unit
Servo
A
mplifiers
Distribution Board
Operator's
Panel
Machine
Frame
Ground
S
ystemGround
Motor
Figure 2-16. Motion Mate DSM314 System Grounding Connections