Munters EM52 Manual De Uso Y Mantenimiento página 11

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.
6. INVERTER
This chapter illustrates the main characteristics of the
inverter that equips some versions of the fans.
6.1 Working range
Voltage Phases
208 - 230Vac Single
(-15% / +10%) or 3-phases
400 - 480Vac 3-phases
(-15% / +10%)
STAR: TN, TT and IT. DELTA corner grounded
Ambient working temperature:
RH%
The Motor and Inverter are IP66
Frequency
phase 50 or 60Hz
50 or 60Hz
-20°C ÷ 50°C
0 ÷ 95%
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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
Connection scheme
fig.3 wiring diagram for single-phase models
fig.4 wiring diagram for three-phase models
The power cable must be separated from the
signal cable as per regulations
The shield of the signal cables (On/Off and 0-
10Vdc or Modbus) must be connected to the
gnd on the control unit side and not to earth.
6.3 Alarm
The following table shows the identification codes of the
possible alarms that the device can generate:
Code Description
1 Over Voltage: device supply voltage too high
2 Under Voltage: supply voltage too low
3 Temperature too high
4 Over Current (lock)
5 Loss of synchronism (lock)
6 Over Current
7 Loss of synchronism
8 Internal communication loss
9 Extra energy dissipated by the braking resistor
10 Broken fuse or loss of phase
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Description
No power supply active
Device working in the correct way
Alarm
Firmware updating