6
PDS SERIES DRIVE USER GUIDE
INSTALLATION
Power
Connections
Input power is taken directly from AC supplies via the front panel
mounted IEC 3-way mains inlet socket. A power cord is supplied
with the drive.
Wiring Guidelines
Proper grounding of electrical equipment is essential to ensure the
safety of personnel. You can reduce the effects of electrical noise
due to electromagnetic interference (EMI) by grounding. All Digiplan
equipment should be properly grounded. A good source of
information on grounding requirements is the National Electrical
Code published by the National Fire Protection Association of
Boston, Massachusetts.
In general, all components and enclosures must be connected to
earth ground to provide a low impedance path for ground fault or
noise-induced currents. All earth ground connections must be
continuous and permanent. A central earth stud is recommended.
The motor ground connection should be connected to the motor
cable shield at the drive end only. To avoid ground loops, the motor
cable shield should not be connected to the motor casing.
Motor
Selection
Usually optimum performance will be obtained when the current
rating of the motor is between 1 and 1.5 times the drive rating (refer
to specification).
For maximum high speed torque a motor rating of 7.5A peak should
be used with the PDS15, 4.5A with the PDS13. The drives can be
derated to accommodate motors with lower current ratings however,
the high speed torque will be reduced.
Do not use a drive setting which gives an output current greater than
the motor rating.
With 4 lead motors the bipolar rating is quoted and this should match
the criteria stated above.
With 6 lead motors the unipolar rating is quoted, but for best
performance with the PDS Drives the centre tap of each winding
should be left unconnected and the connections made between the
winding ends. This will give a bipolar rating 70% of the quoted motor
unipolar rating.
With 8 lead motors the bipolar rating of the motor, which is normally
quoted refers to a parallel winding connection. With the windings
connected in series the current rating of the motor connection will be
50% that of the bipolar rating, and the motor will give improved low-
speed torque, but reduced high-speed torque.
Regenerative
Applications which involve rapid deceleration of high-inertia loads
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