Glentek Inc. 208 Standard Street, El Segundo, California 90245, U.S.A. (310) 322
SMA7130, SMA71075 and SMA71100 MANUAL
Pots Name of Pot Notes
RV1 Differential Gain,
SIGNAL 1
Sets the input voltage to velocity ratio for differential signal
input.
RV2 Signal Gain,
SIGNAL 2
Sets the input voltage to velocity ratio for single-ended signal
input.
RV3
Tach. Gain, TACH
Sets the DC tachometer gain.
RV4
Balance, BAL
Used to null any offsets in system.
RV5
Compensation, COMP
Used in conjunction with tach. gain to set the system
bandwidth.
RV6
Current Limit, I LIMIT
Sets the maximum peak motor current. Shipped set CW
(max. current).
RV7
LOOP GAIN
Used to shut off uncalibrated amplifiers. When the loop gain
is full CCW, no current is delivered to the motor.
Chapter Six: Start Up and Calibration
6.1 Introduction:
This chapter contains the procedure required for initial start up and amplifier calibration. The SMA7130,
SMA71075 and SMA71100 amplifiers can be configured to run in velocity mode (6.3) and current mode (6.4).
Required Equipment: Oscilloscope, voltmeter & battery box. The battery box serves as a step input voltage
command, applying and removing a flashlight battery can also be used for this function. Glentek sells a battery
box, BB-700, which is ideal for this function.
6.2 Initial Start Up:
When applying power to start up your amplifier system for the first time, we recommend you follow this
procedure. If you have already gone through this procedure you can skip to the appropriate calibration
procedure.
1. Check for any loose or damaged components.
2. Check that all connections are tight.
3. Be sure that the motor mechanism is clear of obstructions. If the mechanism has limited motion,e.g:
a lead-screw, set the mechanism to mid-position.
4. Disconnect the signal and auxiliary inputs.
5. Be sure the Loop-Gain pot(s) are fully CCW.
6. Apply main power. Check for the correct AC voltage at input terminal. The DC Bus (amplifier supply-
voltage) will be 1.4 times this value.
7. Work on only one amplifier at a time.
6.3 Calibration of the Velocity Mode Amplifier:
The amplifier, in this configuration, receives an analog, bi-polar input command which is proportional to the
required motor velocity. The amplifier receives velocity feedback from a tachometer or encoder (option) which is
usually mounted to the rear of the motor. The following pots will be set during calibration: (Note: RV7 is a single
turn pot and RV1-RV6 are 20-turn pots.)
Note: RV8-RV11 are factory set and should not be adjusted. Adjusting these pots voids warranty.
CHAPTER 6: START UP AND CALIBRATION
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