Installation manual

Detected Fault Management Parameters
126 S1A53838 09/2011
Catch On The Fly (F301)
If catch-on-the-fly motor starting is enabled (parameter F301 is not set to 0), the drive will detect the motor’s
rotating direction and speed before applying power. This will result in a smooth reapplication of power to a
coasting motor without high current or torque pulses.
If F301 is disabled and the drive is started into a spinning motor, it will apply a low starting frequency to the
motor, operating in current limit until the motor almost stops. Then, the drive will accelerate the motor to the
commanded speed.
Catch-on-the-fly motor starting will be applied if F301 is set to 1 or 3 and:
z There is a brief power loss (the embedded display terminal does not go blank) that results in the drive
removing power from the motor,
z and, there is a continuous run command to the drive (2-wire control)
F301 Set to 1 or 3
Catch-on-the-fly motor starting will be applied if F301 is set to 2 or 3 and:
z The run permissive (logic input assigned to functions 1 or 54) is removed and restored,
z and, there is a continuous run command to the drive (2-wire control)
F301 Set to 2 or 3
If F301 is set to 4, the drive will perform a motor speed and direction search each time it receives a run
command.
Note: Enabling catch-on-the-fly adds about 300 milliseconds to implementation of each start command to the
drive.
Do not use catch-on-the-fly if there is more than one motor supplied by the drive.
Inout Voltage
Motor Speed
Run Command
ON
OFF
Motor Speed
Run Command
ON
OFF
Run Permissive
ON
OFF
Code Name / Description Factory setting
F301 [Catch on fly]
3 (1)
0
1
2
3
4
[Disable]
[Brief power loss] After brief power loss
[Run restored] After run permissive is restored
[Power loss, run] After brief power loss or run permissive is restored
[Each start] During every startup
F632 [Mot overload memo]
Motor Overload Memory 0
0
1
[Disabled] Cleared
If parameter F632 is set to 0, the drive’s memory of the motor’s thermal state (used for overload calculation) is cleared when-
ever the power is cycled.
[Enabled] Retained
If parameter F632 is set to 1, the drive’s memory of the motor’s thermal state is retained even when power is removed. If the
drive is tripped on an Motor Overload detected fault OL2, a cooling time (as calculated by the drive) needs to expire before the
motor can be restarted.
(1) Catch-on-the-fly motor starting after a drive detected fault is active if auto clear is enabled
(parameter
[Number auto reset] (F303) is not set to 0, see page 124)