Model 493.02 Controller Service
Calibrating an LVDT
Calibration
108
Task 2 Turn on hydraulic pressure
This task activates the 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.
1. Ensure that displacement control mode is selected.
Stand-Alone — Path: Status > Control Mode > Disp.
Automated — Check Control Mode on the Station Manager
Function Generator panel.
2. Ensure that the Span is set for 100%.
Stand-Alone — Path: Status > Span
Automated — Check the Master Span setting on the Station
Controls panel
3. Check hydraulic and program interlock indicators.
Stand-Alone — If the Hydraulic Interlock or Program
Interlock indicator is lit on the front panel, determine the cause,
correct it, and then click Reset.
Automated — If the Interlock or Program indicator is lit on the
Station Controls panel, determine the cause, correct it, and then
click Reset or Reset/Override.
If either interlock indicator lights again, you will need to
determine the cause of the interlock and correct it before
proceeding.
4. In the power selection box, click the Low button, and then High
for the HPU. If an HPU is not listed, start the HPU at the pump.
5. If an HSM is present, click the Low button, and then High for the
HSM.