Installation and commissioning
DIGIDRIVE
Variable speed drive
Réf. 3218 GB - 4.33 / d - 02.02
LEROY-SOMER
69
:Control mode
Adjustment range : 0 to 3
Factory setting : 3 then 1
Modes 0, 1 or 3 are used in flux vector
control mode. Mode 2 corresponds to U/f
control with a fixed boost.
CAUTION:
• For modification of this parameter to
be taken into account, the drive must be
locked or faulty.
0 : Open loop flux vector mode with
autocalibration without rotation.
The stator resistance and voltage offset are
measured each time the drive receives a
run command. If the autocalibration
procedure fails, see parameter 3
3
8
8
"Selection of autocalibration".
These measurements are only valid if the
motor is stopped, and totally defluxed. No
measurement is taken if the run command
is given less than 2 seconds after the
previous stop (the resistance and offset
values for the previous measurement are
then taken into account).
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.
1 : Open loop flux vector mode without
autocalibration.
The stator resistance and voltage offset
are not measured.
This mode is of course the least
effective: it should only be used when
mode 0 is incompatible with the
operating cycle. If necessary, during
commissioning, autocalibration should
be performed (3
3
8
8
= 1 for autocalibration
without rotation or 3
3
8
8
= 2 for
autocalibration with rotation).
2 : Voltage-frequency ratio with adjustable
fixed boost
The boost can be adjusted at parameter
4
4
9
9
.
CAUTION:
• Use this mode to control several
motors.
• If the application requires a flying
restart (see 3
3
3
3
), perform autocalibration
(see 3
3
8
8
), before modifying the control
mode 4
4
8
8
= 2 (if not, the drive may trip on
an "OU" or "OIAC") fault.
3 : Open loop flux vector mode with
autocalibration without rotation on
initial starting.
The stator resistance and voltage offset
are measured the first time the drive
receives a run command, or after a
return to factory settings. Then, 4
4
8
8
automatically reverts to 1.
If the autocalibration procedure fails,
see parameter 3
3
8
8
"Selection of
autocalibration".
:Boost
Adjustment range : 0 to 25.0% of motor U
n
Factory setting : 3.0% motor U
n
For operation in U/f mode (4
4
8
8
set at 2),
parameter 4
4
9
9
is used to overflux the motor
at low speed so that it delivers more torque
on starting. It is a percentage of the rated
motor voltage (U
n
).
4
4
8
8
08
Motor
voltage
Boost
08
/2
39
/2 39
Motor
frequency
49
4
4
9
9
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