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Frequently
Asked Questions
Mechanical
Scanivalves
Q:
My Scanivalve will not step. Answer
Q:
My Scanivalve System steps, but it is very rough.
Answer
Q:
My Scanivalve System tries to step, but it is
cannot complete the step. Answer
Q:
My Scanivalve cannot find Home.
Answer
Q:
How do I interface to the Scanivalve Encoder.
Answer
Q:
How do I connect the wires on a Solenoid
Drive? Answer
Q:
What is the recommended Lubrication and
Maintenance schedule for Scanivalves?
Answer
Q:
What is Balance Pressure and
how should it be applied? Answer
My
Scanivalve will not step.
Scanivalves with solenoid drives require 24 Vdc
at 4 to 6 amps to step.
Scanivalves with stepper motors require a step
or home contact closure. These systems have opto-isolated
inputs that require a pull up voltage. If this
voltage is present, the power supply may be at
fault.
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My
Scanivalve System steps, but it is very rough.
The motor driver board or the power supply board
may have to be replaced.
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FAQs on Mechanical Scanivalves
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all FAQ topics
My
Scanivalve System tries to step, but it is cannot
complete the step.
The motor driver board or the motor logic board
may have to be replaced.
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My
Scanivalve cannot find Home.
Odd-Even or other encoders in Type J, D, or S
Scanivalves may have to be aligned. Scanivalve
systems also may need encoder re-alignments, but
they could also have a failed optical diode.
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How
do I interface to the Scanivalve Encoder.
Encoder circuits wiring diagrams may be downloaded
from the Product Information Section of this website.
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FAQs on Mechanical Scanivalves
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How
do I connect the wires on a Solenoid Drive?
Solenoid Drive wiring diagrams may be downloaded
from the Product Information Section of this website.
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What
is the recommended Lubrication and Maintenance
schedule for Scanivalves?
This information may be downloaded from the Product
Information Section of this website.
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FAQs on Mechanical Scanivalves
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What
is Balance Pressure and how should it be applied?
Older Type D, Type S, and all Fluid Switch Wafers(except
model W62) require balance pressure for proper
operation. The balance pressure should be equal
to the average input pressure. Also, input pressures
should be equally distributed around the inputs
to prevent very high pressures in one quadrant.
If the input pressures are below ambient pressure,
Balance pressure may not need to be applied unless
the pressures will be greater than 3 psi below
ambient. At that time a low vacuum pressure may
need to be applied.
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