Bosch rexroth M1-16 Series - Page 39

RE 64025-B/2021-08-12, Bosch Rexroth AG
Operation | Control blocks for mobile applications 39/54
• Control units, amplifiers, sensors, encoders, solenoids
– Minimum storage temperature: –50°C
– Installation and complete function as of –40°C
• Devices with displays (unless specified in more detail)
– Minimum storage temperature: –20°C
– Installation and complete function as of –20°C
• With switching and proportional solenoids, it may be expected that hysteresis
can increase or switching times can be extended due to increasing operating fluid
viscosity at reducing temperatures.
1� Heat all components to at least –40°C.
2� Start the drive motor
3� Run the pump to its operating temperature according to the specification
(seedatasheet 90300-03-B)
4� Warm-up phase of the open hydraulic system
– Pump starts up with diesel engine and should be run for at least 10 minutes
at the diesel engine's idle speed to guarantee self-lubrication.
– The pump must be in pressure-reduced closed-circuit (max. of 50bar and
max.of 50% delivery rate).
– Loading the open circuit, e.g. using a separate preload valve, generates
acirculation pressure of about 50bar at the pump. Keep maintaining these
operating conditions until a hydraulic fluid temperature of 0°C is reached in
the system. While doing this, the diesel engine speed must not be increased.
– After this, slowly actuate all of the machine functions several times at the
lowest load to heat up the machine as evenly as possible. When doing this,
monitor the reservoir temperature, which drops again as a result of the cold
hydraulic fluid that flows back.
5� For operation at low temperatures, it is recommend that you provide flushing
from the pump to the control block and to the reservoir to maintain the
temperature difference between the hydraulic fluid and the control valve within
permissible limits.
Depending on the version, such flushing can also be already integrated in the
control block.
6� The system flushes the covers in hydraulically pilot operated valves with
reservoir oil via flushing channels.
7� After running the pump to its operating temperature, slowly actuate all the
consumers without loading to replace the cold oil in the consumers with warm
oil.
8� Flushing should continue during operation to keep consumers that are only
used occasionally at the operating temperature.
9� Continuous flushing is necessary in all the components to avoid temperature
shocks. The temperature difference between the operating fluid and the
individual components may be a maximum of 20°C.
10� Our control blocks can be fully loaded from a circuit temperature of ≥0°C in
the machine onwards.
Notice on the electronics
Procedure