28
Maintenance / replacement
7.3
Replacing the electronic drive unit
Do not exercise any mechanical load on the electronic drive unit.
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if neces-
sary.
Only separate the pump and the electronic drive unit from each other after disconnect-
ing the supply voltage and the complete standstill of the pump.
Remove the vacuum pump from the system, if necessary.
Unscrew Allen head screws (3x) from the electronic drive unit.
Pull the electronic drive unit off the pump.
Screw on and connect new electronic drive unit to the turbopump.
– Tightening torque:
2.5 Nm
.
Rotation speed set
value
The typical nominal rotation speed of a turbopump is factory-set in the electronic drive
unit. If the electronic drive unit is replaced or a different pump type is used, the reference
set value of the nominal rotation speed must be confirmed. This procedure is part of a
redundant safety system for avoiding excess rotation speeds.
Adjust the parameter
[P:777]
according to the pump type.
Alternatively
: If no display and control unit is available, please use the "SpeedCon-
figurator" of the spare parts delivery.
NOTICE
Damages to the pump and drive
Even after the mains power is switched off, the subsequently running pump delivers
electric power to the electronic drive unit. There is a danger of electric body contact by
premature separating the pump from the electronic drive unit.
Never separate the electronic drive unit from the pump when the mains power is con-
nected or the rotor is running.
Operating parameters of the electronic drive unit
The factory operating parameters are always preset with replacement shipments.
The use of a HPU enables the storing and the reuse of an existing parameter record.
Reset any individually changed application parameters.
Refer to the manual "Electronic drive unit".
Fig. 13: Assembly / disassembly of the TC 400
8
Electronic drive unit
57
Allen head screw
8
57
HiPace
Nominal rotation speed confirmation [P:777]
300
1000 Hz
400 / 700 / 800
820 Hz
