Munters EC52, Руководство по эксплуатации и техническому обслуживанию

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29 | © Munters AB, 2018
In particular, perform the following operations:
1. Equipotential earthing wiring safeguard:
•
check the fan visually, verifying that there are no particular mechanical irregularities
or foreign bodies inside the structure;
•
check that the protective structures (fixed guards made of metal mesh) are correctly
positioned and fixed;
•
check that the emergency stop function actuator operates correctly.
WARNING
Tension the belt after three days of operation: improper tension will
lead to premature wear on the transmission devices.
2. Checking the electrical system:
•
check that the supply conductors are properly fixed to the terminals of the isolating
switch;
•
check the connections of the conductors in the equipotential earthing wiring
safeguard;
•
check that the guards inside the electrical panel are correctly positioned and fixed;
•
check that the safety devices are receiving power and are active, and check their
effectiveness.
After this series of checks has been carried out, the fan is ready for its first startup.
WARNING
Some models of our fans allow to adjust the number of revolutions
through inverter (also called VFD). In case of adjustment made by VFD the installer
has to pay particular attention to the following aspects:
•
it is necessary that the resistance of the ground line to which the equipment are
connected has a very low values (about 15-20 ohm) in order to avoid high currents
that can flow through the motor bearings and damage them.
•
It is necessary to install the proper line filters, to avoid interference and allow proper
operation of the equipment.
•
The minimum frequency of operation of the engines in the case of absence of a
forced external ventilation is 30 Hz. In the case of an operating frequency below 30
Hz is necessary to provide an external forced ventilation to the engine.