Table of Contents
Advertisement
Maintenance
Check and
and Lubricate
Lubricate the
Check
Check
and
Lubricate
1. Check the ground rod (18):
a. Use Maintenance screen 5 to raise and lower
the ground rod. See
Valve Resets and Test, page
b. Activate the ground rod to raise it and
deactivate it to lower it several times. Listen
for the sound of the ground rod making
contact when raising and lowering. In both
cases, the ground rod should fully retract or
extend in less than 2 seconds.
2. If the ground rod takes more than 2 seconds to
fully retract or extend, use the following steps to
lubricate the cylinder.
3. Relieve pressure in the system. Follow the
Pressure Relief Procedure, page
4. Slide the electrostatic shield (12) up to remove.
5. Lubricate the ground rod (18):
a. Clip the tie straps that hold the bleed resistor
(24) and ground rod together.
b. Remove the two screws (124), lock washers
(22), flat washers (19), and spacers (123)
that hold the ground rod to the back panel.
c. Tip the ground rod forward and put 5 drops
of lubricating oil in the small air exhaust hole
at the top of the cylinder.
d. To reassemble, tip the ground rod back into
the cabinet. Reattach the screws (124), lock
washers (22), flat washers (19), and spacers
(123). Fasten new tie straps around the
bleed resistor and ground rod.
e. This process may move the wires at the
bottom of the components. After the
reassembly is complete, check the continuity
between the fluid pressure regulator, bleed
resistor, and ground rod.
6. Close the enclosure doors and reapply pressure
to the system.
7. Repeat step 1. Activate the cylinder 10 times and
then verify that the cylinder speed is less than
2 seconds.
70
the Ground
Ground Rod
Rod
the
Ground
Rod
Maintenance 5: Misc
62.
30.
Check the
the Bleed
Bleed Resistor
Check
Check
the
Bleed
The bleed resistor (24) is used to help discharge the
system voltage and to measure system performance.
If the displayed voltage appears to be inaccurate,
use the following procedure to check the resistance
value of the bleed resistor.
Use megohmmeter Part No. 241079 (AB) and an
applied voltage of 500 V.
1. Prepare the isolation system for service. See
Prepare the Isolation System for Service, page
90.
2. Use a flat blade screwdriver to open the isolation
cabinet door.
3. Slide the electrostatic shield (12) up to remove.
4. Follow the wire from the top of the bleed resistor
(24) to the kV board (428) and loosen the
terminal screw to remove the wire.
5. Attach the positive lead of the megohmeter to the
wire and touch the negative lead to the threaded
stud at the bottom end of the bleed resistor (24).
6. Measure the resistance. The resistance should
be between 9 and 11 Gigohms.
• If the value is inside the range, then calibrate
the bleed resistor. Follow the procedure in
Calibrate the Bleed Resistor, page
• If the value is lower than 9 Gigohm or higher
than 11 Gigohm, then replace the resistor.
7. Reattach the wire in the terminal screw.
8. Reinstall the electrostatic shield (12) inside the
cabinet.
9. Close the cabinet door and use a flat blade
screwdriver to secure the door shut.
Check
Check the
Check
the Door
the
Door Switch
Door
A door switch interlock automatically discharges the
system voltage any time the door on the isolation
cabinet (1) is open. Use this procedure to determine
whether the door switch is working properly.
1. Navigate to Maintenance screen 5 and activate
the grounding rod (N). See
Valve Resets and Test, page
2. Manually depress the door switch. If you hear
the ground rod retract and extend within a few
seconds, the door switch is working properly.
Resistor
Resistor
59.
Switch
Switch
Maintenance 5: Misc
62.
3A7312D
Advertisement
Table of Contents
Troubleshooting
