MTS Series 793 - Manual (Page 162)

MTS Series 793 Tuning and Calibration
Force Sensor Calibration
Calibration Procedures 162
Task 2 Turn on hydraulic pressure
Do not place any part of your body in the path of a moving actuator.
A crush zone exists between the actuator and any equipment in the path of
its movement. Immediate and unexpected actuator response is possible
when you apply hydraulic pressure to your system.
Stay clear of the actuators when applying hydraulic pressure.
See “Turn on hydraulic pressure” on page 136 for a detailed procedure.
Task 3 Verify the conditioner polarity
This task checks the polarity of the conditioner. Different types of test systems
are configured with different conditioner polarities. The polarity of the
conditioner, the polarity of the valve driver, and the connection positions of
system cabling all play a role in controlling the actuator and determining how
signals are displayed.
This procedure assumes the servovalve polarity is set to Normal on the Station
Setup Drive panel Valve tab.
1. Check the sensor connection.
Be sure the force sensor is properly connected to the controller.
2. Apply a load to the force sensor.
Push on the force sensor (with your hand) and note the signal value on the
DVM, front panel meter (Standalone), or Station Signals (automated).
If the signal value is positive for actuator compression, the conditioner
polarity is correct. If desired, you can change the conditioner polarity to
make the signal value negative for actuator compression.
Note The polarity setting should be the same when calibrating additional
ranges for the same sensor.
WARNING