Sprint Electric 200XLV, Product Manual

Page: 8 / 25

2 Introduction
The unit incorporates a PID controller for implementing speed control with tachometer
feedback or position control using a linear actuator.
This is configurable to provide Proportional (P), Proportional/Integral (PI) or Proportional/
Integral/Differential (PID) control features.
The 200XLV also has a speed setpoint ramp facility that limits the rate of change of output
current in applications where rapid response is uneccessary or undesirable .
The thermal dissipation of the unit may be very high when providing maximum output
current at low armature voltages. For protection, the linear control element has an internal
current limit and built-in thermal protection that can cause the unit to shut down. If this
occurs, extra cooling is required by fixing the 200XLV to a metal surface, a heatsink, or by fan
cooling. Refer to "1.1.3 Power output and heatsink" on page 4.
1.1.1 External DC Power Supply Considerations
Power the 200XLV from a battery source or an AC-derived power supply.
In specifying the dc power supply to the 200XLV, consider the following parameters:
1.
Minimum V
DD
for full speed
The 200XLV needs an overhead of 8 V on the dc supply to operate correctly. Thus for an
armature voltage (Va) of 24 V, the nominal dc voltage V
DD
must be 32 V.
2. L imit V
DD
to minimise dissipation
A higher voltage dc supply than calculated in 1. above will provide correct operation.
However, the excess voltage will increase power dissipation unnecessarily and might
result in nuisance tripping.
3. Maximum allowable voltage of 60 V must not be exceeded.
Ripple on an unregulated nominal dc supply may be the cause for exceeding the
maximum allowable voltage.
4. Duty Cycle of the motor when specifying the current rating of the dc supply.
5. Supply regulation and tolerance.
Ensure that the dc supply voltage does not fall below the minimum V
DD
when on load or
during incoming supply voltage variations.
6. Additional voltage may be added to the armature voltage Va to allow for I
a
R
a
drop.
The unit has +10 V and +5 V precision references and positive and negative differential
speed demand inputs.
The output stage has built-in thermal protection and a current limit, plus a built-in automatic
re-settable trip to provide further protection. For extra low-current applications, you can fit
an additional low-current re-settable trip.
NOTE: V
DD
= external dc supply voltage