INSTALLATION
7
Power Dump
Option
may require that the drive is fitted with a power dissipation circuit.
The PDS15-D has the same electrical specification as the PDS15
but incorporates a power dump with a continuous rating of 15 watts
(170 watts peak). You will need the PDS15-D in the following
situation:
Metric formula - if the deceleration time t<{J
ω
2
- 0.1}
where t is the deceleration time in seconds
J is the total system inertia in Kg-m
2
ω
is the maximum speed in revolutions per second
Imperial formula - if the deceleration time t<{0.02J
ω
2
- 100}
where t is the deceleration time in milliseconds
J is the total system inertia in oz-in
2
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.
Motor Connections
Once you have determined the motor's wiring configuration, connect
the motor leads to the connector marked "MOTOR" on the front
panel. The motor cable earth conductor and screen should be
connected to the terminal marked “GND”.
MOTOR CONNECTOR
A+
A-
Gnd
B+
B-
MOTOR
HOUSING
MOTOR
To reverse motor rotation relative to the direction input, interchange
connections to A+ and A–.
Figure 1 PDS Drive Motor Connections
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