Ultra
Assembly, installation and operating instructions
29
7
Electrical connection
IMPORTANT NOTE!
Condensation formation in the cooling unit!
In the event of on-site valve control, the cooling valve must be closed when the fans are switched off.
IMPORTANT NOTE!
Switch the unit on and off at the control input!
Do not switch the unit on and off at the mains, since a fault message is generated for up to 10 seconds after
the mains power is switched on! After this time, the EC fan's electronic circuit is ready for operation and a
reliable status message is possible. If no fault is detected, the relay is energised after the initialisation
period. The fan restarts automatically when control voltage or the stored speed setpoint is applied, after a
mains power failure for example.
IMPORTANT NOTE!
Integrated overload protection for EC fans
All EC fans have integrated overload protection. An upstream motor protective device is not required.
First connect the protective earth "PE" conductor to the motor junction box or to the KaControl recirculation
air module. When disconnecting, be sure to disconnect the earth terminal last. Connect up the unit in ac-
cordance with the valid connection diagram.
To ensure that the switch-on current limit is active, wait until the mains power has been disconnected for at
least 90 seconds before restarting!
IMPORTANT NOTE!
Special conditions for use in IT systems
Use in IT systems is governed by special conditions, and these are set out in the EC fan operation manual!
IMPORTANT NOTE!
Only connect up units with a circuit breaker that switches off all poles from the mains power supply with a
contact gap of at least 3 mm! Only connect the unit to permanently installed lines. The operator of the unit
is responsible for ensuring EMC compliance of the entire system in accordance with the locally applicable
standards.
