
Maintenance
CI-3K50601 Project 2191 DMR2731 Rev.1 18-08-11
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6 Maintenance
Warning
During normal operation, voltages hazardous to life may be present at some of the
terminals of this unit. Installation and servicing should be performed only by qualified,
properly trained personnel abiding by local regulations. Ensure all supplies are de-
energised before attempting connection or other procedures.
Terminals should not be user accessible after installation and external installation
provisions must be sufficient to prevent hazards under fault conditions.
This unit is not intended to function as part of a system providing the sole means of
fault protection - good engineering practice dictates that any critical function be
protected by at least two independent and diverse means.
This unit does not have internal fuses, therefore external fuses must be used for
protection and safety under fault conditions.
In normal use, little maintenance is needed. As appropriate for service conditions, isolate from
electrical power, inspect the unit and remove any dust or other foreign material present.
Periodically check all connections for freedom from corrosion and screw tightness, particularly if
vibration is present.
The front of the case should be wiped with a dry cloth only. Use minimal pressure, especially over
the viewing window area. If necessary wipe the rear case with a dry cloth. If a cleaning agent is
necessary, isopropyl alcohol is the only recommended agent and should be used sparingly. Water
should not be used. If the rear case exterior or terminals should be contaminated accidentally with
water, the unit must be thoroughly dried before further service. Should it be suspected that water
might have entered the unit, factory inspection and refurbishment is recommended.
In the unlikely event of a repair being necessary, it is recommended that the unit be returned to the
factory or nearest TE Connectivity/Crompton Instruments service centre.