4.10 Frequency converter (WD200)
Frequency converter is started and stopped using potential-free release contact in
burner control. Frequency converter alarm is connected to burner control with 12…24
VDC voltage signal that causes burner safety stop.
Frequency converter is controlled with 0 / 4…20 mA signal. Frequency converter
operation must be linear.
Control signal filters and decelerations must be removed. Acceleration and
deceleration time ramps must be shorter than servomotor time ramps programmed in
burner control. Minimum output frequency must be set to 0 Hz to ensure that fan motor
will reach required speed under all operating conditions. Maximum output frequency
must be set to 105.2 % of mains frequency, because burner control maximum speed
value is 95 %.
In 1000 M and 1200 M burners with a 60 Hz configuration, the
maximum output frequency is 52.5 Hz.
4.11 Setting frequency converter parameters (WD200)
Parameters for frequency converter used for fan motor control must be set before the
first start-up.
Parameter initial state:
● Start/stop is controlled by burner control.
● Frequency converter alarm contact sends alarm data to burner control.
● Burner control controls output frequency with 0 / 4…20 mA signal.
● Remove control signal filtering and delays.
● Set acceleration and deceleration time at 2 s.
● Set the minimum frequency to 0 Hz.
● Set the maximum frequency to 105.2 % of the motor's nominal speed.
Inductive sensor detects fan motor rotation speed from motor axle. It generates 90°,
210° and 270° pulse intervals, from which rotation direction and speed are acquired.
Rotation speed detection is a safety function.
See frequency converter manual for detailed instructions.
After parameters for frequency converter are set, standardize the rotation speed.
M4263 2206EN
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