Test Oil Tank; Cooling The Test Oil; Heating The Test Oil - Bosch EPS 625 Manual Original

en 54 | EPS 625 | Product description
3.6

Test oil tank

1 2
4
Fig. 13: Test oil tank
1 Test oil tank cover
2 Fasteners for oil tank cover
3 Test oil tank
4 Temperature probe
The test oil tank, mounted on the frame of the EPS 625,
has a capacity of 50 lts. To access the test oil tank,
open the rear bottom panel (Fig. 1, Pos. 15).
A test oil heater is provided for heating the test oil.
To measure the test oil temperature, a temperature
probe (Fig. 13, Pos. 4) is provided. An oil level sensor is
provided to prevent dry running of the tandem pump.
i
There must be a minimum quantity of 30 lts of test
oil in the test oil tank. This is to ensure that there is
enough test oil during operation.
During calibration, the test oil is routed back from the
fuel injection pump to the test oil tank.
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3.6.1

Cooling the test oil

1 2 3
Fig. 14: Inlet and outlet for cooling water
1 Heat exchanger
2 Cooling water outlet
3 Cooling water inlet
The test oil is cooled by a heat exchanger
(Fig. 14, Pos. 1). The test oil flows through the cooling
pipes and dissipates heat to the cooling water.
The test oil temperature is measured by the tempera-
ture sensors and is controlled by the cooling water sup-
plied to the heat exchanger. The supply of cooling water
is controlled by the logic board through solenoid valves.
i
See chapter 10 for details on requirements for cool-
ing water.
3.6.2

Heating the test oil

The test oil is heated by an electrical resistance heater
installed in the test oil tank. The test oil heater can be
switched on / off when the <Switch on / off heater>
key on the HMI is switched on / off.
i
To prevent the risk of fire due to overheating of test
oil, adequate safety measures have been provided.
The time required for heating the test oil from room
temperature to 40 °C depends on the amount of test oil
in the tank.
When the <Test oil pump on / off> key is switched on,
the heater and water inlet valve are used for maintain-
ing the oil temperature at the inlet / outlet (depend-
ing on the user selection). The temperature sensors
continuously monitor the temperature. The tem-
perature values are also displayed on the HMI display
(Fig. 8, Pos. 1).
Robert Bosch GmbH