14-04 PWM Random
Option: Function:
[0] * Off No change of the acoustic motor switching noise.
[1] On Transforms the acoustic motor switching noise from a clear ringing tone
to a less noticeable ‘white’ noise. This is achieved by slightly and ran-
domly altering the synchronism of the pulse width modulated output
phases.
14-1* Mains On/Off
Parameters for configuring mains failure monitoring and handling.
14-10 Mains Failure
Option: Function:
Select the function at which the frequency converter must act, when the
threshold set in par.14-11
Mains Voltage at Mains Fault has been reached
or a
Mains Failure Inverse
command is activated via one of the digital in-
puts (par. 5-1*).
[0] * No function The energy left in the capacitor bank will be used to "drive" the motor,
but will be discharged.
[1] Ctrl. ramp-down The frequency converter will perform a controlled ramp-down. par.
2-10
Brake Function must be set to
Off
[0].
[3] Coasting The inverter will turn off and the capacitor bank will back up the control
card then ensuring a faster restart when mains reconnected (at short
power zags).
[4] Kinetic back-up The frequency converter will ride through by controlling speed for gen-
erative operation of the motor utilizing the moment of inertia of the
system as long as sufficient energy is present.
Note
For best performance of controlled ramp-down and kinetic back-up par.1-03
Torque Characteristics should be
set to
Compressor
[0] or
Variable Torque
[1] (no automatic energy optimization should be active).
Illustration 4. 2: Controlled Ramp-down - short mains failure. Ramping down to stop followed by ramping up to
reference.
Parameter Description
152 TR200 Programming Guide
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