Trane TR200 Series Programming Manual page 153

Parameter Description
14-04 PWM Random
Option:
[0] * Off
[1] On
14-1* Mains On/Off
Parameters for configuring mains failure monitoring and handling.
14-10 Mains Failure
Option:
[0] * No function
[1] Ctrl. ramp-down
[3] Coasting
[4] Kinetic back-up
Note
For best performance of controlled ramp-down and kinetic back-up par.1-03
Compressor Variable Torque
set to [0] or
Illustration 4. 2: Controlled Ramp-down - short mains failure. Ramping down to stop followed by ramping up to
reference.
152
Function:
No change of the acoustic motor switching noise.
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.
Function:
Select the function at which the frequency converter must act, when the
threshold set in par.14-11 Mains Voltage at Mains Fault
Mains Failure Inverse
or a command is activated via one of the digital in-
puts (par. 5-1*).
The energy left in the capacitor bank will be used to "drive" the motor,
but will be discharged.
The frequency converter will perform a controlled ramp-down. par.
2-10 Brake Function must be set to
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).
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.
[1] (no automatic energy optimization should be active).
has been reached
Off
[0].
Torque Characteristics
TR200 Programming Guide
should be