Agilent Technologies U1840A Medalist sj5000, Hardware Manual

Page: 185 / 192

Maintenance
12
Agilent U1840A Medalist sj5000 Hardware Manual 12-9
Yearly Maintenance
Carry out the following maintenance procedure every quarter:
• Carry out the quarterly routine.
• Isolate the sj5000 from the mains supply.
• Remove the bottom side panels and the rear access panel.
• Physically check all electrical connections in the following
areas:
• Electrical control panel
• XY table
• PC
• Motor controller
• All earth cables
• All connectors
• Carry out the following test which gives an indication of the
insulation resistance of the cables and whether the mains
supply to the body of the machine is intact and complies with
the relevant standards.
a
Power off the machine.
b
Switch off the mains isolator.
c
Disconnect the power plugs for the monitor, PC, UPS (if
used) and camera.
d
Disconnect all AC power for the DC power supply, stepper
drive (P403) and servo drives (Kollmorgen drives). Ensure
that all the disconnected cables are not touching anything.
e
Disconnect the AC noise filter input and output cables
and bypass it. Also disconnect the main AC contactor and
bypass it.
f
Using an insulation resistance tester, check between L
(cable #1) and earth (refer to the
Electrical Drawing
document). There should be a reading of > 1 Mohm.
g
Check between N (cable #2) and earth. It should have the
same reading.
h
Reconnect all cables after the insulation test.
WARNING
This procedure should only be carried out by a fully qualified
technician.