CAIRplus Electrical Connection
PR-2009-0096-GB • Subject to modifications • R8-10/2015 53
7.2.3 Frequency inverter
Make the parameter settings in the course of unit start-up.
7.2.4 EC Fans
EC fans and motors provide air movement with the highest efficiency factor. Highly effi-
cient electronically commuted motors with permanent magnets are used with variable
speeds via integrated controller.
• Connect the fans according to the attached documentation/wiring diagram and
observe the manufacturer's instructions.
• When using earth leakage circuit breakers, make sure that they are sensitive to
universal current (type B).
• If the control cables are wired to a terminal box, observe the pin assignment shown
in the following wiring diagram:
7.2.5 Service switch
Install a lockable service switch near the access door of the fan chamber.
When there is a factory-mounted service switch, the wiring is run up to the motor.
ATTENTION
Risk of damage to the unit!
• Do not activate the parameter "overmodulation" as this can damage the impeller.
• Permanent magnet motors (PM motor) without integrated electronics may only
be connected to suitable frequency inverters.
• It is not possible to operate several PM motors with one frequency inverter.
Notice!
In this case, DencoHappel neither accepts warranty claims nor assumes liability.
• Ensure that the maximum frequency does not exceed the allowable limit (refer
to data sheet on fan).
• Consider the relevant instructions specified in the enclosed manual for the
frequency inverter. Use a screened motor cable only.
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