Temperature Measurement And Control; Temperature Control For Ve Pumps; Power Supply For Start / Stop Valve (For Distributor Pumps) - Bosch EPS 625 Manual Original

3.7

Temperature measurement and control

As soon as the drive motor is switched on, the test oil
temperature is regulated by way of the heating and the
water control valve.
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For fuel injection pumps of a certain size, the test
oil warms up while testing the fuel injection pumps
and hence, no additional heating is required. In case
of larger fuel injection pumps, heating the test oil
causes the temperature to exceed beyond the pre-
scribed limit. It is then necessary to cool the test oil.
Fuel injection pumps should be calibrated only when
the test oil is heated within the specified tempera-
ture limits.
The valve connected in front of the heat exchanger sup-
plies enough cooling water so that the preset test oil
temperature is maintained. If test oil heating is on and
the temperature in the test oil tank exceeds 70°C, the
EPS 625 initiates emergency automatically.
The EPS 625 can be restarted and the test oil heating
can be switched on again after the temperature of the
test oil reduces below 70°C.
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If the temperature sensor is not connected or is
damaged, an error message is
chapter 6 for the list of error messages.
3.8

Temperature control for VE pumps

Because of the overflow throttle, there is significant
heat generation when a VE pump is in operation. When
larger VE pumps are operated at high speeds, the over-
flow temperature rises quickly. There is some delay in
reducing the temperature within limits. To facilitate
quicker cooling, the flushing valve is used.
Pressing the flushing valve causes the overflow oil to
flow to the tank. This reduces the heat generation in
the pump enabling a quicker reduction in overflow tem-
perature.
!
Do not press the flushing valve during measurement
of injected and overflow quantity. This will lead to
wrong results.
Robert Bosch GmbH
3.9
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displayed. Refer to
Fig. 15:
1 Lubricating oil pressure regulator (optional)
2 Power supply sockets
3 Test oil pressure regulator
For operation of the pump solenoid, a set of cables (red
and black) and crocodile clips are provided. These can
be used for connection to any one of the sockets based
on the pump type to be tested.
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Product description | EPS 625 | 51
Power supply for start / stop valve
(for distributor pumps)
Never connect two or more items of electrical equip-
ment (e.g. solenoid valve) to the 12/24 V supply
terminals of the EPS 625, as this could damage the
electrical equipment!
Never disconnect or connect electrical equipment
with the EPS 625 switched on.
The operating current should not exceed 6 A.
1
Front panel
Ensure that the crocodile clips do not short. Else,
the Miniature Circuit Breaker (MCB) in the electrical
cabinet (F5 for 12 V and F6 for 24 V) will trip. Switch
on the MCB (F5 for 12 V and F6 for 24 V) in case it
trips.
en
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1 689 988 262 2017-12-26