Instruction Manual ZHK
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7.3 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.
NOTICE!
-
The maximum admissible motor speed depends on the maximum admissible
fan speed. The maximum admissible fan speed is specified on the order-re-
lated technical data sheets. For safety reasons, the maximum admissible fan
speed must not be exceeded!
-
In order to prevent high vibration loads and damage, critical speeds or operat-
ing frequencies must be avoided, see
chapter 8.3.2 (Vibration verification).
EUROCLIMA, therefore, recommends that operating conditions are continually monitored and as-
sessed.
When using residual current circuit breakers (RCDs), the supply line must be protected by means
of an all-current sensitive (type B or 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).
7.4 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.
2. Has a clearly marked OFF (0) and ON (I) position.
3. The OFF position is lockable, to secure against unauthorized or unintentional restart.
4. For outdoor installation the main switch must be at least IP65.
5. Interrupts the power supply to the AHU (lighting can be excluded, refer to
chapter 7.9 (Light-
).
6. Separates the electrical equipment from the main supply.
7. Is easily accessible
8. Mounted within sight of the AHU.
9. The allocation to the AHU can be clearly seen.
10.
Emergency stop function
: The main switch (red switch with yellow background)
must be
connected to the control system with appropriate components
in order to ensure the
emergency stop function works effectively. Reset means that a manual start command, sepa-
rate from main switch, must be activated.
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