Parker PDHX-E Series User Manual page 19

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 of the PDHX-E
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.
Please note that under exceptional operating conditions, for instance prolonged running at
high speed, under certain fault conditions or if the drive current setting is too high, the motor
temperature may become higher than normal. This may represent a safety hazard if the
operator has access to the motor.
Regenerative Power Dump Option
Applications which involve rapid deceleration of high-inertia loads may require that the drive
is fitted with a power dissipation circuit. The PDHX15E-D has the same electrical
specification as the PDHX15E but incorporates a power dump with a continuous rating of 15
watts (170 watts peak).
Metric formula - if the deceleration time t<{Jω
where t is the deceleration time in seconds
J is the total system inertia in Kg-m
ω is the maximum speed in revolutions per second
Imperial formula - if the deceleration time t<{0.02Jω
where t is the deceleration time in milliseconds
J is the total system inertia in oz-in
ω is the maximum speed in revolutions per second
If the expression in brackets is negative, the power dump option is not required. This option
is strongly recommended for size 42 (106) motors.
Note that a program to calculate if a power dump is required is available from Compumotor
and Digiplan Technical Support departments (Windows 3.1 required). This program is also
available on Compumotor's Bulletin Board Service (Tel: 707/584-4059 in USA).
Long Motor Leads
Using a motor with long leads will cause the cabling resistance to become significant when
compared to the resistance of the motor. The DC volt drop of the cable and motor
connection when measured at the drive, should not exceed 5 volts in order to limit power
dissipation in the drive and maintain maximum system performance.
To maintain EMC compatibility, the motor leads must be assembled and connected as
defined under Motor Wiring EMC Requirements .
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You will need the PDHX15E-D in the following situation:
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