Pfeiffer Vacuum A 1204H, Operating Instructions Manual

Page: 39 / 92

Advanced settings
39
7.4 Functional block temperature management
7.4.1 Thermostatic control of the functional block
The temperature regulation in the FB prevents deposits or condensation of process by-
products in the pump and limits corrosion.
The water circuit regulates the heat in the HP and LP stages of the functional block. It is
composed of following components, figure
(see 7.3) :
Thresholds are set in [SETTING] [TEMPERATURE] [LP FB T°]/[HP FB T°] [CON-
TROL] .
The water valves are supplied independently of pump start-up according to temperature
setpoints. If the temperature is lower than the setpoint, the valve closes. If the tempera-
ture exceeds the setpoint, the valve opens. If the measured temperature is higher by 5°C
or lower by 10°C than the setpoint, a warning appears. If the temperature exceeds the
set threshold, an alarm appears..
This monitoring is possible once at least the setpoint temperature is reached. Otherwise
the valve remains closed and the temperature faults are not managed.
7.4.2 Functional block temperature
The measure of the FB temperature is available by setting the menu [SETTING] [TEM-
PERATURE] [LP FB T°] / [HP FB T°] on [MEASUREMENT] . 2 monitoring thresholds
(warning and alarm) and associated delay can be set.
The choice of measurement mode applies to both valves HP/LP. Switching to measure-
ment mode automatically opens the solenoid valves of the FB.
7.5 Roots temperature
The Roots cooling cicuit is fitted with a manual valve 10 which allows the Roots body to
be cooled or not, depending on the application. A temperature probe TR measures the
Roots temperature (on A 604/A 804), figure (see 7.3) .
2 monitoring thresholds (warning and alarm) and associated delay can be set, [SET-
TING] [TEMPERATURE] [ROOTS 1 T° ] [MEASUREMENT] [WARNING]/[ALARM]
[THRESHOLD]/[DELAY]
(see 8.2) . If the temperature exceeds the set threshold, a fault
appears after the expiry of the delay.
7 LP water valve (if present) Regulate the temperature of the HP and LP stages
8 HP water valve
T
HP
HP temperature sensor Measure the stage temperature
T
LP
LP temperature sensor (if present)
Alarm m
pump stopped
Temperature
Time
Alarm threshold
T°se 5°C
T°setpoint - 10°C
No message
Warning message ‘high temperature’
Warning message ‘low temperature’
alarm
T