28
Maintenance / replacement
7.3
Replacing the electronic drive unit
Fig. 11: Assembly / disassembly of the TC 600
Î
Do not exercise any mechanical load on the electronic drive unit.
Î
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if
necessary.
Î
Remove the vacuum pump from the system, if necessary.
Î
Unscrew Allen head screws (2 x) from the electronic drive unit.
Î
Pull the electronic drive unit off the pump.
Î
Screw on and connect new electronic drive unit to the turbopump.
WARNING
Danger of electric shock
Even after mains power is switched off, the subsequently running turbopump delivers
voltages > 50 V
eff.
. There is a danger of electric shock when touching open contacts
on conducting parts.
Î
Never separate the electronic drive unit from the pump when the mains power is
connected or the rotor is running.
Î
Wait for the turbopump to reach complete standstill.
Î
Disconnect the electronic drive unit from the mains.
NOTE
Operating parameters of the electronic drive unit
The factory operating parameters are always preset with replacement shipments.
Î
The use of a HPU enables the storing and the reuse of an existing parameter record.
Î
Reset any individually changed application parameters.
Î
Refer to the manual "Pumping operations".
8
Electronic drive unit
9
Allen head screw
9
8
