22
Operation
• Settings are possible via the RS485 on the TC 600 by using DCU, HPU or PC.
Turbopump motor
After the pumping station is switched on and the self-test successfully completed
(duration approx. 10 seconds), the turbopump is set into operation. During opera-
tion, the turbopump can be switched off and on again, while the pumping station
remains switched on. The turbopump is not vented thereby.
Pumping station
Connected pumping station components (e.g. backing pump, venting valve, air
cooling) are triggered and, with "turbopump motor" input simultaneously activat-
ed, the turbopump is set into operation after a successfully completed self-test (du-
ration approx. 10 seconds).
Heating/Reset
Heating (Option)
After the rotation speed switchpoint is reached, the heating is switched on and
switched off again when this point is fallen below. A purge gas valve can optionally
be triggered here.
Reset
The heating input is assigned a dual function (
(see p. 17, chap. 5.6)
, Point 5 ”Re-
set“).
Standby
With the use of "Standby", the turbopump can be operated either at 66% of the
nominal rotation speed (Standby ON) or at the nominal rotation speed (Standby
OFF).
Speed actuation mode via PWM input
A pulse-width-modulated (PWM) signal permits setting the speed within the range
of 20 - 100% of the nominal rotation speed.
If a signal is present, the pump runs up to the final rotation speed. Optionally, a
PWM adapter box for turbopumps can be connected.
Switch outputs
The switch outputs 1 and 2 can be loaded with a maximum 24 V / 50 mA per output.
The following functions are assigned to the switching outputs:
• Switching output 1: Active high after the rotation speed switchpoint is reached.
The switch-point for the turbopump is set at 80% of the nominal rotation speed.
It can, for example, be used for a "pump operational" message.
• Switching output 2: Active low in case of malfunction(common error message).
Base frequency 100 Hz ±20%
Amplitude 24 V max.
Key ratio 25 - 75%
T
0
U
20%*f
100%*f
end
max. +33V
min. +13V
max. +7V
min. -33V
T
T
PWM
*25%
*75%
T
= 10ms (1±20%)
f
=100Hz (1±20%)
end
PWM
PWM
PWM