7 Advanced settings
This chapter describes the available functions and how they work. This chapter helps the
user and/or the integrator to configure the pump parameters according to the requirements
during the process.
7.1 Pump temperature management system
The temperature management system (TMS) fitted on the
MT version
pump consists on a heater band
and a water solenoid valve.
The integrated heater band heats the pump to an adjustable temperature (refered to as temperature
setpoint) to prevent the effects of condensation. The temperature setpoint depends on the application
the pump is to be used for. Contact Pfeiffer Vacuum’s applications department for advice in choosing
the correct temperature setpoint.
The heater band and the water solenoid valve allow to manage the pump temperature up to the temper-
ature setpoint. The electronic drive unit controls this temperature setpoint. The temperature setpoint is
selected via the HHR control panel or via the serial link or fieldbus (see chapter “Control modes”).
Depending on the temperature setpoint chosen to heat the pump and the temperature of the cooling
water circuit, the pump can take a certain amount of time to reach the specified temperature.
7.2 Pump braking
Braking with air inlet solenoid valve
Braking with air inlet solenoid valve reduces the time required to stop the pump when electrical braking
is not sufficient.
The air inlet solenoid valve is installed on the pump exhaust. The air inlet solenoid valve (flow
11 · 10
3
sccm), is designed to reduce the braking time required for the pump to get up to atmospheric
pressure. When isolation valves are installed on the pump inlet and exhaust, the rotor slow-down effi-
ciency is improved.
24 VDC power supply and air inlet valve control are the customer’s responsibility “Connection of the air
inlet solenoid valve”.
Electric braking
Electric braking is available on ATH 500 MT models.
Electric braking makes it possible to slow the pump by sending a
'Stop'
order to the pump, or in the
event of a default stop, after a delay of 15 minutes during which time the pump can be kept under vac-
uum.
Advanced settings
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