Warnings 17
If the load regenerates or regenerative braking is employed, then a DC rated armature fuse with the correct
I
2
t r ating in series with the motor armature is highly recommende d.
See 4.4 ESSENTIAL pre-start checks.
A protective c lean earth connection must be made to the control 0V on T13 to ensure that the installation
complies with protective class1 requirements. See 4.4 ESSENTIAL pre-start checks.
The emergency stopping and safety procedure, inc luding local and remote a ctuators must be che cked prior to
applying power to the motor. See 4.4 ESSENTIAL pre-start checks.
If you wish to abandon changes made since the last save, simply remove the control supply WITHOUT
having performed parameter save. See 5.1.2 PARA METER S A VE.
Sometimes it is useful to return a unit to its default setup condition. E.g. a trial configuration may prove to be
un workable and it is easier to start again. If all 4 keys are held down during the application of the control
supply, then the drive will automatically display the default parameters and connections. (EXCEPT those in
the CALIBRATION me nu, and 100)FIELD VOLTS OP % for MOTOR 1 and MOTOR 2, and 680)Iarm BURDEN
OHMS). The defaults will only be permanently retained ho w ever if they are then saved using the
PARA METER SA VE menu. To revert to the last saved set, simply turn the control supply off, without doing a
PARA METER S A VE and on again.
Also the PASSWORD is reset to 0000. See 11.2 DISPLA Y FUNC TIONS / PASSW ORD C ONTROL.
See also 13.13.2 DRIVE PERSON ALITY / Recipe page PIN 677, for details of 2 and 3 key reset operation
and po w er up messages. See 5.1.3 Restoring the drive parameters to the default condition.
If your DESIRED M A XIMUM RPM is higher than the BA SE RA TED RPM then you will need to implement field
weakening in the CHANGE PARA METERS / FIELD CONTROL menu. You must however verify that your motor
and load are rated for rotation above base speed. Failure to do so may result in mechanical failure with
disastrous consequences. If ho wever your desired maximum rpm is lo w compared to the base rpm then you
need to be aw are of the heat dissipation in the motor at full torque. Use motor force venting if necessary.
See 6.1.6 C ALIBRA TION / Desired max rpm PIN 6 Q UICK ST ART.
WARNING. Do not use AVF feedback mode with field weak ening systems. See 6.9.6 FIELD C ONTROL / FLD
WEAKENIN G MENU for a note about A VF / field weakening trip.
A V F feedback contains more ripple than tacho feedback. It may be necessary for smooth operation to reduce
the SPEED CONTROL loop gain with A VF. See 6.7.4 SPEED CO NTROL / Speed proportional gain PIN 71.
See 6.1.9 C ALIBRATIO N / Speed feedback type PIN 9 QUICK START.
When the drive is first being commissioned it is recommended that the A V F mode be used initially. This
allows any other speed feedback transducers to be examined for correct outputs prior to relying on them for
control safety. For systems employing a DC contactor you must use T41 and T43 for remote AVF.
See 6.1.9 C ALIBRATIO N / Speed feedback type PIN 9 QUICK START.
Current loop control terms. If you change your supply voltage, current calibration or motor type, the 3 values
for PINs 93/94/95 must be adjusted accordingly. (Either by using the AUTOTUNE function or manually).
See 6.8.9 CURRENT C ONTROL / Autotune enable PIN 92
See 6.8.12.1 Setting the current loop control terms manually.
Warning. Field reversal or disconnection.
Due to the high inductance of motor fields it may take several seconds for the field current to decay to zero
after the field output has been inhibited by the PL/X. Do not open circuit the fiel d unless the field curr ent has
reached zero. See 6.9 CHAN GE PARAMETERS / FIELD C ONTROL.
WARNING. When using field weakeni ng and a DC side power contactor, the motor armature must be
connected to the REMOTE AV sensing terminals T41 and T43. Failure to do this will cause flashover of the
commutator because the AVF feedback is lost when the contactor opens.
See 6.9.6 FIELD C ON TROL / FLD WEA KENING MENU.
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