Wolf KG Standard Installation And Maintenance Instructions Manual page 12

Electrical connection
Electrical connection, EC fan
12
Electrical connection
Electrical connection should only be carried out by an electrician in accordance
with the applicable regulations (VDE, power supply utility, etc.).
If the supply or extract air fan is shut down or fails, all control valves must
close automatically and the hot/cold water and scrubber pumps must
stop. Only use normally closed control valves and a frost stat without restart
lock. Otherwise, some components will continue to operate when the system
is shut down, which will prevent the safety equipment from working (e.g. frost
protection would not be guaranteed).
In order to safely shut down the air handling unit, install a lockable maintenance
isolator for every drive motor.
If, due to structural requirements, additional protective equipotential bonding is
required, this should be provided on site. The user or the certified electrician is
obliged to ensure correct earthing of the units in accordance with the applicable
national and local electrical and installation regulations.
Make the electrical connection in accordance with local regulations. After making
the electrical connection, a safety check of the installation must be carried out
in accordance with VDE 0701 Part 1 and VDE 0702. During commissioning, it
is important to ensure that the rotational direction of the fan is correct. Observe
the indicator arrow on the back panel of the unit.
Use only electric motors that are designed to drive fans.
Please note
It is essential that you take note of the connection diagram in the terminal
box, because if connected incorrectly, the motor may not be able to provide
its full output or may be destroyed.
For motors with PTC thermistors, use a PTC thermistor trigger device; for motors
with thermal contacts, use an interlock contactor; and for motors without PTC
thermistors or thermal contacts, use a thermal overload relay.
If connecting several KG : Connect the thermal contacts and frost stats in series.
Connect the KG motors and servomotors in parallel.
EC motors can be operated at variable speed across the entire range via a
0 – 10 V signal (DC). The motors are generally equipped with internally wired
temperature monitors.
Never route the unit's control cables immediately parallel to the power cable.
Ensure that there is as much clearance as possible.
Recommendation: Clearance > 10 cm (separate cable guide)
If the EC fan is only connected to the mains without connecting an additional
Please note
control unit to the fan's control connection, a jumper must be inserted between
the connections 0 – 10 V /PVM and +10 V. In this case, the fan runs at maximum
speed or air volume.
Motor fault
To restart the motor, switch off the mains voltage for at least 25 s and then
switch it back on.
Only AC/DC-sensitive fault current safety devices (type B) are permissible.
RCD
We recommend RCDs with a trip threshold of 300 mA.
Terminals and connections are live even when the unit has been switched off.
Do not touch the unit for 5 minutes after disconnecting the power across all
poles. If control voltage is present or a set speed is saved, the motor will restart
automatically, e.g. following a power failure.
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