Rev. 0 - 11/12/2020
OPERATING MANUAL
OPERATING MANUAL
EN
EN
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13. OTHER VARIABLES
There are other variables that can be monitored for a safe use of the fan.
13.1 Bus voltage
The BUS voltage is the DC voltage on the bus capacitors. The driver is continuously monitoring this voltage and will stop the motor
in the event of under-voltage or over-voltage.
The value can be monitored through the
Input Register 9
.
13.2 Motor voltage
The motor voltage is the peak value of the phase voltage module. To know the rms line to line value, it must be multiplied by √3/2.
The value can be monitored through the
Input Register 13
.
14. DERATING AND OVERHEATING PROTECTIONS
When the temperature of the driver components overtakes a defined temperature threshold, the performance is automatically
reduced to decrease the heating. It is possible to check in real time the temperature by reading the
Input Register 15
.
If it is not possible to reach a steady thermal equilibrium, the driver shuts down. The protection acts limiting the current to the
motor. In this condition the driver goes in alarm (see chapter 17).
Once the temperature on the driver decreases under 75°C, the alarm is automatically reset.
14.1 Driver overheating: DERATING
The motor is protected through one or more Thermal Protectors. If the motor temperature is too high, the thermal protector opens
one phase and the driver recognizes the error and stops the fan (see chapter 17).
14.2 Motor overheating: THERMAL PROTECTOR
The Motor Winding temperature and the driver derating are dependent on the fan size and on the fan working point.
Therefore, it is possible that the fan could work at 50°C without a performance limitation.
The Driver and motor areas are rated for operating in a temperature range between -20°C and +40°C. The derating is tested and
guaranteed from +40°C to +50°C.
Higher temperatures could damage the motor winding or the performance could be significantly reduced.
WARNING
WARNING
Summary of Contents for EC FAN FDP
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