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5.6 Control cabinet function
The control cabinet main components are two VFD's.
The first VFD controls the speed of the electrical motor driving the hydraulic pump.
This VFD also contains a configurable function for start/stop logic, speed or torque
(pressure) control and start cooling command. Speed/torque control can be
activated with a switch on the front panel.
Start/stop of the hydraulic flow is via front panel buttons in local drive mode or via a
dry contact connected to terminals for start/stop in remote mode.
The command for setting of speed or pressure is via a front panel potentiometer in
local mode and via terminals for a 4-20mA signal in remote mode. Selection of local
or remote mode is done with a front panel switch.
Indicators of speed and pressure are available on the front panel.
The second VFD controls the speed of the electrical motor driving the air-oil cooler
fan. The speed of the fan is controlled by the oil temperature in the hydraulic tank.
Minimum oil level and maximum oil temp in the tank are monitored with indication
on the front panel and will stop the drive at critical level. Clogged return oil filter will
be indicated on the front panel
DD00081610
Fig. 4: Monitoring logic diagram
Hägglunds DOb, RE 15327-WA/05.2017, Installation and maintenance manual, Bosch Rexroth AB
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