300 SERIES USER GUIDE
7
Basic Amplifier
: Current-Mode,
NO Tachometer
Use this checklist for applications that don't employ a tachometer. These include
microprocessor control systems that get position feedback from an encoder on the
motor, as well as non-motor applications such as magnet-coil, solenoids, or other loads
that require a set current from the amplifier in response to a control-voltage at the
inputs. The components on the J17 header come from the factory preset for this
operating mode. See functional diagram on page 2.
1. Connect DC power supply to amplifier +HV and GND. Check voltage to see that is is
within the amplifiers' rating.
2. Ground amplifier to chassis at GND pin DD.
3. Connect motor or load between OUT+ and OUT-. Do not ground load!
4. Connect reference voltage source to REF+ and REF- inputs.
5. Ground ENABLE,POS ENABLE, NEG ENABLE to amplifier logic ground.
6. Set FEEDBACK pot to full CW.
7. Set V
ref
to 0V
8. Turn power on
9. Check for green LED indicating Normal operation.
10. Adjust BALANCE trimpot for 0.0V between OUT+ and OUT-
11. Momentarily increase Reference voltage (±10V max).
12. Check motor direction: is it OK?
YES: continue
NO: remove power, reverse connections to Ref+ and Ref-.
13. Set Reference voltage to maximum value (+/-10V)
14. Check load current at CURRENT MONITOR output
15. Apply step or square-wave signal to Ref-inputs, adjust FEEDBACK CCW for
best response with no oscillation.
Amplifier Connections
Numbered terminals are on the brown 22-pin connector. Double-letter terminals are on
the orange 4-pin connector. See appendix for connector part numbers.
15
16
17
7
+HV
GND
+
-
DC
OUT+
OUT-
MOTOR
AA
DD
CHASSIS GND
1
2
AMPLIFIER
BB
CC
REF+
REF-
ENABLE
POS ENABLE
NEG ENABLE
LOGIC GND
CONTROLLER
OUT
GND
POWER
SUPPLY
22-Pin 4-Pin
Fig. 1
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