KEB COMBIVERT F5 Betriebsanleitung Seite 54

3.4 Temperature, Mois-
ture Condensation
and Carriage
24
The inlet temperature may amount to maximally 40°C. Due to high air humidity and
high temperatures it can lead to moisture condensation. Moisture condensation
is dangerous for the inverter, because the inverter can be destroyed by possible
occuring short-circuits.
The user guarantees that any moisture condensation is avoided!
In order to avoid a moisture condensation the following possibilities can be done.
The application of both methods is recommended.
- Supply of temper coolant
This is possible by using heatings in the cooling circuit for the control of the coolant
temperature. Select a long cycle time in An.46 or An.52 (see programming example
on page 25).
There is a dew point table in the annex available.
Temperature Control
This function serves only for the temperature control of water-cooled inverters. The
cooling system can be connected by means of pneumatic or magnetic valves. A
relay is frontend.To avoid pressure surges, the valves for a temperature control must
be inserted before the cooling circuit. All usual valves can be used. Pay attention
that the valves are faultless and do not clamp. If possible, the switching states of
the valves should be monitored in the machine control. The relais must be made
available on the customer dependent on the assigned valve and with attention to
the current carrying capacity of the digital outputs of the frequency inverters. The
control is made by the analog outputs 3 + 4 and markers as pulse-width modulation
signal, which are assigned to digital outputs. Two functions must be programmed,
because the temperature ranges of the inverter and the motor are different.
Attention! Do not use the relay output, use the transistor outputs 1, 2!
During transport of storage below the freezing point, the heat sink must be com-
pletely drained with air pressure.