Rockwell-automation 1746-QV,D17466.18 OPEN-LOOP VELOCITY CONTL Manual de usuario descargar pdf (Pagina 18)

4–2

Setting Up the Hardware

Publication

1746-6.18 April 1998

Module outputs connect to a separate 2-conductor output terminal

block located beneath the input terminal block.

1746-QV

Output

Terminal Block

Analog Output

10v dc)

Dif

Input

Outputs

to valves

Servo Amplifier

(Proportional)

(+)

(–)

o solenoid A

o solenoid B

+24V dc PS

0V dc PS

Important:

Ground the shield of the amplifier

output cable to a 0V connection in the amplifier

Do not connect the shield to earth ground.

Note: Follow manufacturer recommendations for shielding the output

cables of the proportional amplifier. Typically, pulse-width modulated

outputs radiate electrical noise originating from the +24V dc power

supply, so isolate the shields of the amplifier output cable to a 0V dc

connection inside the proportional amplifier.

You have a choice of three configurations to match your hydraulics:

• proportional amplifier with ramp and proportional valve

• servo amplifier with ramp and variable-volume pump

• Allen-Bradley 1305 Drive and hydraulic pump

You may use either of the following output voltage ranges:

• 0-10V dc for the Allen-Bradley 1305 Drive or variable-volume pump

• –10 to +10V dc for the proportional amplifier and proportional valve

Important: Signals in this type of control system are very susceptible

to radiated electrical noise. The module is designed to set the loss-of-

sensor bit I:e.0/8 and the LDT-error bit I:e.0/0 when it detects position

values that are lost or corrupted by electrical noise.

Connect module output terminals to output devices with correct bonding:

• connect power supply output commons together

• electrically isolate power supply output commons from earth ground

• use bond wires that are equal in size to signal wires

Minimize interference from radiated electrical noise with correct

shielding and grounding:

• connect all of the following to earth ground:

– LDT flange, frame, and machine

– I/O chassis

– protective ground

– AC ground

– cable shields at one end only, preferably with 3/8” braid wire

(for analog output, "15V dc PS, 24V dc PS, and LDT)

– terminal 4 of the input terminal block

Connect Module Outputs

to Output Devices

Minimizing Interference

from Radiated Electrical

Noise

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