Rockwell Automation 1391ES AC Servo Controller - Manual (Page 34)

Inputs, Outputs and Adjustments
Chapter 5
5-32
Switch Settings This section provides information on setting the Duty Cycle Selector
switch (SW1), Current Scaling switch (S1), configuration switches (S2)
and the A Quad B Encoder Output switch (S3). Refer to Figure 5.2 for
switch locations. Note that the settings for 1326AP motors are the same as
1326AB motors.
Duty Cycle Selector Switch - SW1
The Duty Cycle Selector Switch (SW1) which is located on top of the
controller, modifies the behavior of the shunt regulator. The switch
determines the temperature level and therefore the average power level at
which the controller will fault. Refer to Chapter 9 for detailed switch
setting information.
Current Feedback Scaling Switch - S1
The 1391B-ES employs a current feedback scaling circuit which allows a
controller to be used with 1326 AC Servomotors having lower current
ratings.
Tables 5.B and C provide the information necessary to correctly set the
current feedback scaling using switch S1. Table 5.B provides general
information on switch settings for typical motor / controller combinations.
Table 5.C provides examples of switch settings for specific 1326 AC
Servomotors. Refer to the motor nameplate for actual rated current (I
C
is
continuous current rating in amperes).
Important: The motor and controller rated current (as listed on their
respective nameplates) should be noted and the correct adjustment of
switch S1 made prior to applying power to the system.
Set S1 to a position equal or nearest to the rated motor current. One setting
higher must be used if the motor current is between current ratings. Once
the current feedback scaling is set, the current limit and peak current
capabilities will be a function of the motor current rating and not the
controller current rating.