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IndraDrive X Drive Controllers Power Sections XCS1, XMD1,
XMQ1
General interference suppression measures for relays, contactors, switches, chokes and in‐
ductive loads
Information on interference suppression measures
In the case of non-shielded lines belonging to the same circuit, twist the
supply and return lines.
If inductive loads, such as chokes, contactors or relays are switched by
contacts or semiconductors in conjunction with electronic devices and
components, suitable interference suppression has to be provided for them:
●
By arranging free-wheeling diodes in the case of d.c. operation
●
In the case of a.c. operation, by arranging usual RC interference
suppression elements depending on the contactor type, immediately at
the inductance
Only the interference suppression element placed immediately at the
inductance serves the purpose. Otherwise, the radiated noise level is too
high and may affect the function of electronics and drive.
If high-frequency interference injection occurs in spite of the recommended
interference suppression measures, the source of interference should be
identified and removed in the control cabinet or in the field.
Possible sources of interference in the control cabinet:
●
Frequency converters
●
Contactors featuring a control coil without interference suppression
●
24 V DC brush motors
●
24 V solenoid valves
●
Incorrect line routing
Possible sources of interference in the field:
●
Improper ground connections of installation parts or machine parts
●
Installation parts or machine parts that are charged electrostatically
during the operating process and cannot discharge
If it is impossible to find the source of interference, connect the heat sink of
the drive controller directly to the bare metal mounting surface using a
grounding strip (as short as possible; cross section ≥ 10 mm
Mounting, dismounting and electrical installation
R911392532_Edition 01 Bosch Rexroth AG
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