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Setting the Current Loop Gain

Setting the Current Loop Gain correctly allows you to maximize your motor's performance. The SD17060B

takes into account the line voltage, output current and motor impedances when determining the optimum gain

for your system.

Assuming a stable line voltage of 115 Vac, the following gains should be used for AMCI motors. These gain

settings are averaged values based on a large sample of motors. Your system may benefit from increasing or

decreasing these settings. In general, increase the setting by one or two counts to improve high speed perfor-

mance or decrease the settings for quieter low speed operation.

If you are using a non-AMCI motor, use the following procedure to determine the correct gain for your sys-

tem. The

SWITCH SETTINGS

urn off all of the switches in switch bank SB2. This configures the Current Loop Gain setting to its

"AutoID" value.

2) Verify that the motor current is set correctly. (Switch SB3-5 and switch bank SB4.)

3) Verify that the motor is attached to the driver.

4) Cycle power to the driver. The STEP/FAULT LED will begin to blink almost immediately. Count the

number of blinks. This number is what you should initially set the Current Loop Gain to.

5) Set the switches in SB2 to equal the number of times the STEP/FAULT LED blinked.

6) Cycle power to the SD17060B and verify motor operation using the System Checkout procedure on

the following page. If need be, adjust the Current Loop Gain settings up or down depending on your

application.

In some cases, the Current Loop Gain can be set to its AutoMode setting and the SD17060B will automati-

cally determine the proper gain on every power up or reset. This procedure is done in under two seconds.

The Current Loop Gain's AutoMode setting, though convenient, should be used with caution.

Changes in the system while the gain is being measured, such as a change in line voltage, or

noise being injected into the motor cable, can force the drive to set the gain to an incorrect

value. This can lead to a system that appears to randomly fail when power is cycled to the

drive. AMCI strongly suggests using the above procedure to set the gain to a fixed value

whenever possible.

VERIFYING SYSTEM SETUP

MOTOR CURRENT

SM2340-130

SM2340-240

SM34-450

SM34-850

SM34-1100

SM23-130 (Series)

SM23-130 (Parallel)

SM23-240 (Series)

SM23-240 (Parallel)

section on page 9 should be used to verify switch settings.

GAIN SETTINGS



1 A

1.5 A

2 A

ADVANCED MICRO CONTROLS INC.

3 A

4 A