18 Warnings
WARNING. All these alarms are generated by semiconductor electronics. Loc al safety codes may mandate
electro-mechanical alarm systems. All alarms must be tested in the final applic ation prior to use. The
suppliers and manufactur ers of the PL/X are not responsible for system safety.
See 8.1 MOTOR DRIVE ALARMS menu.
WARNING. The feedback loss protection afforded in field weakening mode is limited to total feedback loss
only. This is because the speed / AVF relationship is not maintained in field weakening mode. If a partial loss
of feedback occurs the motor may run to excessive speed. When the field has been completely weakened
and is at its minimum leve l, the armature overvoltage trip will come into operation. This may only occur at a
dangerous speed. It is therefore recommended that a mechanical device and or back up system be utilised to
protect against this possibility. See 6.9.6.8 FLD WE AKENING MENU / Minimum field current % PIN 110.
And 8.1.1 MOT OR DRIVE ALARMS / Speed feedback mismatch trip enable PIN 171.
WARNING. For rate d field currents that are less than 25% of model rating the alarm threshold may be too
low to trigger. The alarm must be teste d. To overcome thi s problem, 4)RATED FIELD AMPS may be set to a
higher level a nd 114)FIELD REFERENCE set lower. This has the effect of raising the threshold.
E.g. Set 4)RATED FIELD AMPS to twice motor rating and 114)FIELD REFERENCE to 50.00%.
See 8.1.3 M OT OR DRIVE ALARMS / Field loss trip enable PIN 173
WARNING. When using a rmature voltage feedback the IR drop may be sufficient to provide a signal in exce ss
of 117)ZERO I NTLK SPD % and hence the stall alarm will not operate. Set 14)IR COMPENSATION as
accurately as possible, and then test the alarm with a stalled motor. (Disable the field) Progressively increase
current limit to above the 179)STALL CUR LEVEL, to check that the AV speed feedback remains below
117)ZERO INTLK SPD %. It may be necessary to incr ease 117)ZERO INTLK SPD % to ensure tripping.
See 8.1.8.1 STALL TRIP MENU / Stall trip enable PIN 178.
After a DATA CORRUPTION message. Check that the calibration parameters and drive personality
Iarm burden value are correct. See 9.1.1 SELF TEST MESSAGE / Data corruption.
Warning the 24V supply on pin 2 may damage your PC or other instrument. If in doubt do not connec t it. The
transmit must be connected to the receive on each port. See 10.1.1 RS232 PORT 1 / Connection pinouts.
Parameter exchange general WARNING. Check the CALIBRATION parameters are correct after any process of
PARAMETER EXCHANGE. See 10.2 RS232 PORT1 / PARA METER EX CH A NGE.
And 10.2.3.3. PARA METER EXCH ANGE / Eeprom transfer betw een units.
WARNING about changing BURDEN OHMS. It is important that 680)Iarm BURDEN OHMS, is set as closely as
possible to the actual resistance used on the power board. DO NOT ALLOW THE MODEL RATING TO
EXCEED THE VALUES IN THE RATING TABLE AND ON THE RATING LABEL FOUND UNDER THE UPPER END
CAP. FAILURE TO HEED THIS WARNING WILL INVALIDATE ANY WARRANTY, AND VIOLATE APPROVAL
STANDARDS. NO LIABILITY IS ACCEPTED BY THE MANUFACTURER AND/OR DISTRIBUTOR FOR FAULTS
CAUSED BY RE-RATING OF THE PRODUCT.See 13.13.4.2 W ARNIN G about changing BURDEN OHMS.
WARNING. All units must be protected by cor rectly rated semi-conductor fuses. Failure to do so will
invalidate warranty.See 14.3 Semiconductor fuse ratings.
WIR ING INSTRUCTIONS. VERY IMPORTANT. Read all warnings in section 14.9
WARNING Safety earthing always takes precedence over EMC earthing.
See 14.11.2 Earthing and screening guidelines.
See 14.11.4 Guidelines when using filters.
The A C supply filter contains high
voltage capacitors and should not be
touched for a period of 20 seconds after
the removal of the A C supply
The A C supply filters must
not be used on supplies that
are un-balanced or float w ith
respect to earth
The drive and A C filter must only be
used with a permanent earth
connection. No plugs/sockets are
allo w ed in the A C supply
IMPORTANT SA FETY W ARNINGS
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