Munters EM Manuel D'utilisation Et De Maintenance page 11

Checking the electrical system:
• check that the supply conductors are properly fixed to the
terminals of the isolating switch;
• check
the connections
thequipotential circuit;
• 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;
• check that the signal lines have the shielded connected
to gnd signal (0V dc) not to gnd power (earth);
• check that the power lines are placed far from the signal
lines in according with the current regulations;
After this series of checks has been carried out, the fan is
ready for its first startup.
Do not operate the fan with the safety
protections removed: safety meshes can be
removed only with specific tools by qualified
technicians when the fan reaches a complete
standstill. The fixing sytems of the safety protections are not
interchangeable with other devices. Therefore, if for
maintenance reasons the user damages or loses any
component, this must be definetely ordered from the
manufacturer as spare parts and it cannot just be replaced
with other components, even similar, not supplied by the
constructor itself. In this particular event the manufacturer
refuses all responsibility on consequent damages caused to
things and people and considers any kind of warranty lost.
Operating conditions of motors with inverter.
Some models of our fans have an embedded
inverter or 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 magnetothermal
differential circuit breaker with the suitable Earth-leakage
sensitivity;
• 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.
Keep motor body clean. Dust deposit on motor
body will lead to overheating and failure of
bearings and motor itself. Do not use water for
motor cleaning. Use compressed air only. Water spraying
will cause rust inside the bearings and lead to their failure.
of the conductors
11 |
6. INVERTER
This chapter illustrates the main characteristics of the
inverter that equips some versions of the fans.
in
6.1 Working range
Voltage
208 - 230Vac
(-15% / +10%)
400 - 480Vac
(-15% / +10%)
STAR: TN, TT and IT. DELTA corner grounded
Ambient working temperature:
RH%
The Motor and Inverter are IP66
6.2 Leds
The device is equipped with two LEDs, one green and one
red, which are used to signal different states of the device
as shown in the following table:
Led Led
Green Red
Off Off
On Off
Off Blinking
Blinking Blinking
© Munters AB
Phases Frequency
Single phase 50 or 60Hz
or 3-phases
3-phases 50 or 60Hz
-20°C ÷ 50°C
0 ÷ 95%
Description
No power supply active
Device working in the correct way
Alarm
Firmware updating