In rare cases and depending on the installation, long
control cables and analog signals can result in 50/60 Hz
ground loops due to noise from mains supply cables.
If ground loops occur, it may be necessary to break the
shield or insert a 100 nF capacitor between the shield and
the chassis.
To avoid ground currents from both groups
aecting other
groups, connect the digital and analog inputs and outputs
separately to the frequency converter common inputs
(terminal 20, 55, 39). For example, switching on the digital
input can disturb the analog input signal.
Input polarity of control terminals
12 13 18 19 27 29 32 33 20 37
+24 VDC
0 VDC
130BT106.10
PNP (Source)
Digital input wiring
Illustration 3.52 PNP (Source)
NPN (Sink)
Digital input wiring
12 13 18 19 27 29 32 33 20 37
+24 VDC
0 VDC
130BT107.11
Illustration 3.53 NPN (Sink)
NOTICE
Control cables must be shielded/armored.
1 Shielding clamps
2 Removed shielding
Illustration 3.54 Grounding of Shielded/Armored Control
Cables
Remember to connect the shields in a proper way to
ensure optimum electrical immunity.
3.4.22 Switches S201, S202, and S801
Use switches S201 (A53) and S202 (A54) to congure the
analog input terminals 53 and 54 as a current (0–20 mA)
or a voltage (-10 V to +10 V).
Enable termination on the RS485 port (terminals 68 and
69) via the switch S801 (BUS TER).
See Illustration 3.50.
Default setting:
S201 (A53) = OFF (voltage input)
S202 (A54) = OFF (voltage input)
S801 (Bus termination) = OFF
How to Install Operating Instructions
MG34Q402 Danfoss A/S © 04/2016 All rights reserved. 55
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