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Fastening torque for electrical connections on the control panel refer to Table 4:
Before connecting to the local power network, check that the local power supply
coincides with the motor requirements from the nameplate. In general the fan
motors are designed for continuous operation. Abnormal operating conditions,
particularly multiple start-ups at short intervals should be avoided, it could lead to
thermal overloading of the motor.
7.2
EC motors
EC motors are variable through an integrated frequency converter. For operation, the supply volt-
age, a digital enable signal and an analog control signal are required for the speed control.
When using residual current circuit breakers (RCDs), the supply line must be protected by means of
a pulsed current (type A) or an all-current sensitive (type B) residual current circuit breaker.
Cable type for motor connection
A shielded cable must be used for the motor cable (supply voltage) and the analog input signal, and
the shield must be grounded on both ends (main switch & motor).
7.3
Main switch (emergency stop switch)
According to the standards IEC / EN 60204 and VDE 0113, all hazardous facilities have to be
equipped with a main switch which separates the plant from all active conductors of the main sup-
ply. This means that every single AHU must be equipped with such a main switch.
The main functions and requirements (in compliance with standards DIN VDE 0660 and IEC
947-3) when using the RED-YELLOW main switch as follows:
1. Is used as a repair, maintenance or safety switch, because the actuation of the switch does not
reset the control commands from control system.
V07-19.0
Figure 68: Rotation marking of EC fans
Thread
Ø
min.
Nm
max. 1,2 2,5
Table 4: Torques for the motor terminal board
M4 M5 M6
0,8 1,8 2,7
4
43/115
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