Rockwell Automation 1391ES AC Servo Controller - Manual (Page 29)

Inputs, Outputs and Adjustments
Chapter 5
5-27
Adjustable Current Limit (TB2, Terminal 5)
The current limit of the controller is set to 300% or twice the continuous
rating of the controller, whichever is lower. Connecting this terminal to
Signal Common will enable potentiometer R148. The range of this pot is
20 to 300% or twice the continuous rating of the controller, whichever is
lower. This is used for feed to hard stop applications. When the workpiece
activates this condition through a limit switch or other user supplied
device, the current will be limited to the value set by R148, protecting the
motor against possible overheating.
Tachometer Output (TB2, Terminal 7)
A voltage corresponding to the motor velocity and direction of rotation will
be present between this terminal and Signal Common. With switch S2-1
(see the section entitled Switch Settings) set to “ON,” a voltage of
±
1.2V
DC/1000 rpm will be present. With the switch in the “OFF” position, a
voltage of
±
2.0V DC/1000 rpm will be present.
I Command Output (TB2, Terminal 8)
The voltage present between this terminal and Signal Common
corresponds to the motor current. A voltage of
±
3.0V DC equals the rated
motor current as set by switch S1.
Enable Input (TB2, Terminals 9, 10)
Normal Run commands to the controller are performed through the Enable
input and any additional user supplied run control circuitry. With input
power applied and the line contactor energized, a solid-state contact closure
(rated +15 to +30V DC, 30 mA) between TB2-10 & 12 or a mechanical
contact closure between TB2-9 & 10 will cause the controller to run. When
this input is de-energized, the control will cause a regenerative braking
action in the motor.
Reset (TB2, Terminal 11)
Removing the Enable signal and momentarily connecting this terminal to
Signal Common will reset the controller after a controller fault occurs.
Important: A Reset must not be initiated until the cause is determined and
corrected.
Low Bus (TB2, Terminal 13)
This terminal provides an open collector output rated at 12V DC, 5mA to
indicate a low bus voltage condition. Reference to Signal Common.
Current Foldback (TB2, Terminal 14)
This terminal provides an open collector output rated at 12V DC, 5mA to
indicate that current foldback is in operation. Reference to Signal
Common.