Shielding And Grounding - Advanced Digital SimpleServo SS504 User Manual

Install the bumpers as follows:
1. Peel off the adhesive cover from the clear bumper. Apply to the DIN rail tab of the SimpleServo (the
moveable tab on the rear of the control that clamps onto the top of the DIN rail).
2. Mount the drive as indicated above.
3. Peel off the adhesive cover from the black bumper. Lift the bottom of the control (while it is still
clamped to the DIN rail) to open a slightly larger air gap between the SimpleServo and the enclosure.
Apply the black bumper to the back of the SimpleServo (the side facing the enclosure) approximately
one inch above the bottom. Release the drive. It should come to rest on the newly applied black
bumper.
W
IRING
Warning!
m
Under no circumstances should power and logic leads be bundled together. Induced voltage can
cause unpredictable behavior in any electronic device, including motor controls.
• Use 18-28 AWG wire for reference and analog signal wiring. Use 12-16 AWG wire for AC line (L1
and L2) and motor (Phase U, V and W) wiring.
S
HIELDING AND GROUNDING
Advanced Digital recommends the use of single-point grounding (SPG) for panel-mounted controls.
Serial grounding (a "daisy chain") is not recommended. The SPG for all enclosures must be tied to
earth ground at the same point. The system ground and equipment grounds for all panel-mounted
enclosures must be individually connected to the SPG for that panel using 14 AWG (5.5 mm) or larger
wire. Refer to Figure 6 for wiring guidelines.
In order to minimize EMI, the chassis must be grounded to the mounting panel (Figure 6). Use 14
AWG (1.6 mm) or larger wire to join the enclosure to earth ground. A lockwasher must be installed
between the enclosure and ground terminal. To ensure maximum contact between the terminal and
enclosure, remove paint in a minimum radius of 0.25 in (6 mm) around the screw hole of the
enclosure.
Advanced Digital recommends the use of the special servo cables provided by Advanced Digital. If
you specify cables other than those provided by Advanced Digital, please make sure all cables are
shielded and properly grounded.
It may be necessary to earth ground the shielded cable (Figure 6). Ground the shield at the
SimpleServo end and at the motor end.
If the SimpleServo continues to pick up noise after grounding the shield, it may be necessary to add
AC line filtering devices and/or an output filter (between drive and servomotor).
EMI Protection
Electromagnetic interference (EMI) is an important concern for users of digital servo control systems.
EMI will cause control systems to behave in unexpected and sometimes dangerous ways. Therefore,
reducing EMI is of primary concern not only for servo control manufacturers such as Advanced Digital,
but the user as well. Proper shielding, grounding and installation practices are critical to EMI reduction.
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