Rev. 1 - 05/10/2021
OPERATING MANUAL
OPERATING MANUAL
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11. OTHER FEATURES
This feature is useful when the speed of the fan is not directly set by the user as fans set in Constant Airflow
Asynchronous Emulation or PID mode.
The alarm is active when a speed threshold is overtaken (5V or 10V depending on the fan model).
11.1 Filter alarm
To activate this feature, the
Holding Register 46 must be set at value 2 and the required Speed Threshold value
must be set into the
Holding Register 55. The digital output of the driver changes its status (see above figure).
11.3 Out of functioning range alarm
The algorithm can catch the position of the rotor after changing the target speed to 0 and to a new value in
short time. If too long time passed and the fan runs at very low speed, it is not possible to catch the speed:
the fan brakes and restarts.
11.4 Flying start (for 3-phase only)
The algorithm can catch the position of the rotor after powering OFF and then ON the fan. If too long time
passed and the fan runs at very low speed it is not possible to catch the speed and the fan brakes and restarts.
11.5 Regeneration (for 3-phase only)
This feature is not available for RDPs.
11.2 Change of limits (for 5.5 kW drivers only)
The Min Speed values set as default are higher than the possible values that can be introduced in this register.
Two limitations are active for this register:
Abolute minimum speed (Hardcoded)
The absolute minimum value that can be set in this register is 10 rpm.
Minimum Speed=2 x Min rpm stp (Holding Register 22 - not changeable by users)
It is suggested to set values equals or higher than the minimum speed default setting. The accelera-
tions and decelerations chosen values are also related to the behaviour of the fan at the minimum
speed set. Heavy changes could trigger overvoltage alarms.