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The C7-623 control unit is used for the automatic ejection control and condition
monitoring of mineral oil separators of the series
• OSA
• OSB
• OSC
With the electronic C7-623/A control unit total ejections of the centrifuge bowl, with
or without previous displacement of the product, are triggered at preset intervals.
The following ejection modes can be selected on the OSC separators:
• partial ejections
• total ejections
• preselectable partial ejections followed by total ejection
With the time-dependent program cycle it is important in respect of high clarifying
efficiency and avoiding desludging losses that the separable solids content in the
product does not fluctuate widely.
The centrifuges with UNITROL system are provided with two basic monitoring sys-
tems:
• Water content monitoring system - WMS
• Sludge space monitoring system - SMS
Series operation is also available for two-stage HFO treatment.
Software assignment to the specific separator is carried out in the factory using a
password function.
Detailed information on the special functions is given in the respective chapters of
this manual.
The illuminated four-line LC display provides information about the operating and
malfunction condition of the separator and, depending on the programming, dis-
plays relevant process data.
The control system comprises, in addition to the control cabinet, all complete line
fittings incorporating electrical components which are controlled or monitored by
the control unit.
These include:
• the dirty oil connection,
• the water connection,
• the operating water connection,
• additionally on UNITROL centrifuges:
- the circuit and water discharge valve
- the water sensor
- and/or the pressure switch for the bypass line in SMS function.
Optional extras:
• multi-purpose thermometer PT 100 for minimum / maximum monitoring in the
dirty oil
• level switch for monitoring the water discharge
• process-dependent control of an external feed pump
• level switch for monitoring the sludge tank
• minimum and maximum level switch for controlling a sludge pump
• klaxon for audible alarm
The standard C7-623 control unit is designed for single operation of purifiers or clar-
ifiers.
If required, series operating mode can be pre-selected for two-stage HFO opera-
tion after entering a password. The MPI interfaces (Multi Point Interface) must be
cabled accordingly (cf. chapter 6.2.12 page 113 ff.).
1.1 Application
1.2 Equipment
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