Rockwell Automation 1771-QB Linear Pos. - Manual (Page 58)

Installing the Linear Positioning Module
Chapter 5
5Ć19
ATTENTION: The polarity of the analog outputs is affected by the
setting of the most significant bit of the analog range words in the
parameter block. (See Chapter 7.) Incorrect wiring of the analog
outputs or an incorrect setting of this most significant bit can cause
the axis to accelerate out of position when the loop is closed.
Power Supply
To connect the analog output supply:
1. Connect the (+) side of the power supply to the +15 VDC module terminal
(33).
2. Connect the (-) side to the -15 VDC module terminal (35).
3. Connect the common to +15 COMMON module terminal (34) and to
ground at the I/O chassis.
4. Connect the shield to ground at the I/O chassis end.
5. Connect the analog power supply chassis to ground.
Analog Output
To connect the analog output of the control loop to the servo valve interface:
1. Be sure that you set the control loop’s voltage/current selection switches to
match your servo valve’s requirements.
2. Check that the analog output power supply is connected.
3. Connect the +ANALOG module terminal (29/30) and the -ANALOG
module terminal (31/32) to the servo valve coil terminals.
Important: If you select voltage output for a loop, the module internally
connects that loop’s -ANALOG terminal to the +15 COMMON terminal (34).
4. Connect the cable shields to ground at the I/O chassis end.
Important: Wire servo valve coils in series. Refer to the instructions for your
device.