Emotron EMX-R Series, Instruction Manual, Page: 18 / 169

Emotron AB 01-3333-01r3 Mounting/connection 13
A safety switch is to be installed between the mains supply and the control unit.
An alarm for loss of power is given if the mains supply is disconnected.
2.2.1 When switching off
When it is desired to switch off the heat exchanger, for example at night, this
can be done using a relay connected in series with the control signal. This relay
interrupts the signal to control signal terminal number 33. In this way, no alarm
about interruption of power supply is given. The control signal can of course
also be reduced to its minimum value, in order to achieve the same result. If the
control signal is low or absent the drive system switches to purging mode.
2.2.2 Recommendations with respect to EMC
In order to fulfil the European EMC Directive 89/336/ECC regarding
electromagnetic compatibility, the following precautions must be taken:
• The motor cable must be mounted as close to the heat exchanger housing as
possible. If the cable is too long, the excess should be collected together in
the form of, for example, a figure “8”. The area enclosed by the cable should
be as small as possible. Electrical tape or cable ties can be used to achieve
this.
Fig. 4 Excess motor cable should be arranged such that the area enclosed is as
small as possible
Special EMC couplings/glands are not necessary. An EMC filter is built into all
EMX-R models.
WARNING! No switch is allowed between the motor and the control
unit.
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RIGHT