IAI America ERC - Manual (Page 129)

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8.3.4 Servo Gain Adjustment
 Servo gain number
The factory setting is optimized in accordance with the standard specification of the actuator.
This setting need not be changed in normal conditions of use. However, an increased load may produce noise
during downward movements depending on the affixing method, load condition or other factor when the actuator
is used in a vertical application. In this case, decreasing the value set in parameter No. 7 will be effective.
However, do not decrease the value below “3” to maintain an overall balance with the actuator.