AKI2G-CDB-MOD-12T-000 | ADDITIONAL INSTALLATION TIPS
7
ADDITIONAL INSTALLATION TIPS
When experiencing communication problems in noisy environments or when operating close to
temperature limits, the following recommendations are to be noticed.
7.1
Grounding the HMI panel
1
2
3
4
5
6
5350
Door
Operator panel
Ferrite core
Mounting plate in the cabinet
Power supply
24 V DC
The mounting clamps of the HMI panel do not provide a secure grounding connection between the
panel and the device cabinet, see 1 in drawing above.
1. Connect a wire, that is sized correctly according to local electrical codes, between the
quick-connect terminal connector on the operator panel and the chassis of the panel, see 2 in
drawing above.
2. Connect a wire or grounding braid, that is sized correctly according to local electrical codes,
between the chassis of the HMI panel and the closest grounding point on the door, see 3 in
drawing above.
3. Connect a strong but short grounding braid between the door and the device cabinet, see 4 in
drawing above.
4. Twist the cables onto the 24 V DC feed, see 5 in drawing above.
2 turns around the ferrite core provide 4 times the suppression of 1 turn.
3 turns around the ferrite core provide 9 times the suppression of 1 turn.
A ferrite core suppresses disturbances to the 24 V feed, see 6 in drawing above.
Note:
The grounding wires should be short and the conductor should have a large area.
A long, thin grounding wire has a very high impedance (resistance) at high frequencies and does not guide
disturbances to the ground.
Multi-wire conductors are better than single wire conductors with the same area.
A braided conductor wire with the same area is even better. The best is a short, thick grounding braid.
ky
Kollmorgen | April 2017
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