23
Operation
A relay is connected between Pin 10 (earth) and the respective switching output Pin
8 or Pin 9.
Contact outputs
• Relay contact 1: The contact between Pin 11 and Pin 12 is closed, if the rotation
switchpoint is exceeded.
• Relay contact 2: The contact between Pin 13 and Pin 14 is closed at failure-free
operation.
Analogue output
Over the analog output, a speed-proportional voltage (0-10 VDC equals 0 - 100 %
*f
end
) can be picked up (load R
≥
10 k
Ω
). Additional functions (optionally current/
power) can be assigned to the analog output via DCU, HPU or PC.
Gas-type-dependent
operation
With gas load and high rotation speed, the rotor heats up strongly. To avoid over-
heating, the TC 600 has implemented a power-rotation speed-characteristic,
whereby the pump can be operated at every rotation speed with the maximum al-
lowable gas load without danger of damage. The maximum power depends on the
gas type. Two characteristics are available in order to completely exhaust the
pump's capacity for each gas type.
• "Gas mode 0" (factory setting) for gases with the molecular mass
≥
40, e.g. Ar
• "Gas mode 1" for all lighter gases.
Fig. 10: Gas mode power characteristic
• Settings are possible via the RS485 on the TC 600 by using DCU, HPU or PC.
• Vertex of the power characteristic
(see p. 34, chap. 13)
The turbopump is always run up under maximum power in order to minimise the
run-up time. When the set rotation speed is achieved, the chosen power character-
istic is automatically switched over. When the gas-type-dependent maximum pow-
er is exceeded, the rotation speed of the turbopump is reduced until an equilibrium
between permissible power and gas friction is attained.
Î
To avoid rotation-speed fluctuations, Pfeiffer Vacuum recommends setting the
equilibrium frequency or a somewhat lower frequency in speed actuation ope-
ration.
CAUTION
Danger of the pump being destroyed
Pumping of gases with the molecular mass
≥
40 in the wrong gas mode can lead to
destruction of the pump.
Î
Ensure the gas mode is correctly set.
Î
Contact Pfeiffer Vacuum before using gases with a greater molecular mass.
Leistung
Frequenz
D
B
C
A
D-C = Gas mode «0»
B-A = Gas mode «1»
Hochlauf
fnom
