MTS Series 215 Rotary Actuator User Manual
Page 62
Series 215 Rotary Actuator Product Manual
62
Actuator Performance Checks
Maintenance
If measured cross vane flow exceeds recommended values in either direction,
refer to the “Excessive Cross Vane Flow” section.
Do not apply hydraulic pressure to the system unless the servovalve
command (DC error) has been zeroed.
If the servovalve command (DC error) does not equal zero when hydraulic
pressure is applied to the system, equipment damage and/or personal injury
can result.
Always ensure that the DC error is zero before applying hydraulic pressure to the
system.
7. Disconnect the hydraulic power supply drainback hose from the actuator
drainback port plumbing. Connect a hose or tubing to the drainback ports on
both the front and rear end caps. Direct the free end of each hose into an
empty pail capable of holding at least 18.9 liters (5 gallons) of fluid.
8. Position the actuator at mid-stroke.
9. Adjust the system controller for zero DC error and apply system hydraulic
pressure according to applicable system procedures.
10. Time the flow of hydraulic fluid coming from each drainback port for one
minute. At the end of one minute, turn off electrical and hydraulic power to
the system and measure the amount of fluid in each pail.
11. If the amount of fluid in each pail is between 0.38–1.9 liters (0.1 gal–0.5
gal), actuator fluid flow is normal.
Note
If measured drainback port flow exceeds recommended values, refer
to”Abnormal Drainback Port Flow” section.
12. If fluid flow is normal, reconnect the hydraulic power supply drainback
hose to the actuator drainback port and tighten the coupling.
Note
If fluid flow is normal but actuator performance is not, abnormal
performance may be caused by improper servovalve balance or other
related system components.
13. If your actuator has a ∆P cell, perform the following procedure to measure
maximum stiction:
A. Rotate the actuator clockwise at system hydraulic pressure.
B. Measure both maximum stiction and variation over stroke.
C. Repeat Steps A and B while rotating the actuator counterclockwise.
D. Check to ensure that maximum stiction did not exceed 50 psi.
Note
If maximum stiction exceeds 50 psi, refer to the ”Maximum Stiction
Exceeded” section.
WARNING