Basic application 41
4.4 ESSENTIAL pre-start checks
This is a summary of the essential parameters that should be checked prior to allo wing power to the motor.
You must be able to put a tick against every section. Failure to comply with these requirements may cause
incorrect functioning or damage to the drive and/or installation and will invalidate any w arranty.
4.4.1 PO WER ENGINEERING
You must be able to put a tick against every section.
1) All exte rnal fuses must be of the correct rating and type. The I
2
t rating must be less
than the rating specified in the rating tables. This includes main and auxiliary fuses.
See 14.3 Semiconductor fuse ratings.
2) Check that the motor armature resistance is about 2 Ohms + /-1 over 36 0 deg rotation.
Check that the field resistance in Ohms = (field dataplate volts) / (field dataplate current).
Look inside the motor terminal box to verify correct wiring.
3) Check the 3 phase auxiliary supply phasing on ELl /2/3 equates to the phasing of the
main stack supply on Ll/2/3, and the 1 ph control supply on T52/53 is correct.
4) The drive and 3 phase supply current and voltage ratings, should be compatible
with the motor and load requirements. (Both armature and field, current and voltage).
5) The cables and termination should be rated to carry the rated current with no more than
a 25C temperature rise, and all terminations should be tightened to the correct torque.
See 14.10 Terminal tightening torques.
6) The main contactor must be operated by the CON1/2 contact on termina ls 45 and 46
7) The wiring should be checked for short circuit faults. A C po wer to ground, signal
and control. DC power to ground, signal and control. Signal to control and ground.
Disconnect the drive for wiring tests using a megger. (Control terminals are plug in type).
8) The engineering standards employed must comply with any local, national or
international codes in force. Safety requirements take priority.
9) If the loa d regenerates or regenerative brak ing is employed, then a DC rated armatur e
fuse with the corr ect I
2
t rating in series with the motor armature is highly recommended.
See 14.3.3 D C semi-conductor fuses.
10) A substantial protective chassis earth connection in accordance with relevant codes
should be made to the terminal bar provided at the bottom edge of the unit.
11) A protective clean earth connection must be made to the control 0V on T13 to ensure
that the installation complies with protective class1 re quirements.
4.4.2 MECH ANIC AL ENGINEERING
1) The motor, and load if fitted, must be free to rotate without causing damage or injury,
even in the event of incorrect rotation direction, or loss of control.
2) Blo w over the commutator using clean dry air to clear it of extraneous matter. Check
that the brushes are correctly seated and that the brush tensions are correct.
3) Check that the motor vent blower is free to rotate, and remember to re-check the
airflow when the blo w er is operating.
4) The emergency stopping and safety procedure, including local and remote actuators
must be checked prior to applying power to the motor.
5) The installation must be clean and free of debris, swarf, clippings, tools etc.
The enclosure must be adequately ventilated with clean dry cool filtered air.
When the motor is running, check the PL/X heatsink fans are operating, and the flo w of
heatsink air is unobstructed. See 14.1 Product rating table , for cooling airflow data.
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