Nidec LEROY-SOMER Powerdrive FX, Commissioning Manual

Page: 26 / 176

26
QUICK SETUP MODE
Commissioning manual Powerdrive MD2/FX
4617 en - 2017.09 / e
Ctr.13 : Open loop mode select ( )
Determines the open loop control mode. The «Rs measured
each run», «Rs not measured», «Rs measured after each
factory setting» and «Rs measured after each power up»
modes are used for flux vector control of induction motors.
These 4 modes are distinguished by the method used to
identify the motor parameters, in particular the stator resistance.
As these parameters vary with temperature and are essential
for obtaining optimum performance, the machine cycle must
be taken into account when selecting the most appropriate
mode.
The «Linear U/F law with boost» and «Square U/F law with
boost» modes correspond to control by U/F ratio modes for
induction motors.
Rs measured each run:
The stator resistance and voltage offset are measured each
time the drive receives a run command.
These measurements are only valid if the machine is stopped, and
totally defluxed. The measurement is not taken when the run
command is given less than 2 seconds after the previous stop.
This is the most effective flux vector control mode. However, the
operating cycle should be compatible with the 2 seconds required
between a stop command and a new run command.
Rs not measured:
The stator resistance and voltage offset are not measured.
This mode is less effective than the «Rs measured each run»
mode but it is compatible with all operating cycles. During
commissioning, an autotune when stopped should be carried
out ( Ctr.14 ) so as to automatically fill in the stator resistance
and voltage offset values.
Linear U/F law with boost:
Voltage-frequency ratio with fixed boost.
Note:
Use this mode to control several motors connected in
parallel.
Rs measured after each factory setting:
After a return to factory settings, the stator resistance and
voltage offset are measured the first time the drive is enabled
(drive output active).
Rs measured after each power up (#):
The stator resistance and voltage offset are measured the first
time the drive is enabled (drive output active) following each
power-up.
CAUTION:
A voltage is briefly applied to the motor. For safety
reasons, no electrical circuit must be accessible once
the drive is powered up.
Square U/F law with boost:
Square voltage/frequency law with fixed boost.
Motor voltage
Boost
Motor
frequency
Mtr.04/
2
Mtr.04
Mtr.01/
2
Mtr.01
Motor voltage
Boost
Motor frequency
Mtr.04
Mtr.01