4−10 Electric Drives
and Controls
Bosch Rexroth AG RhoMotion 1070072365 / 04
Electrical Connections
4.5 Monitoring of the temperature and the CPU ventilator
The temperature of the power supply unit is monitored. When the am-
bient temperature of 58 °C is exceeded, a pre-warning appears. When
the rho4.0 software recognizes this warning, the rho4.0 is shut down, the
error cause is stored and the power supply unit is switched off. If a PHG is
connected to the rho4.0 during the shut-down, the message ’Overhea-
ted’ appears at the display. This message remains displayed until the
rho4.0 is switched off or the reset actuated.
When the rho4.0 software does not shut down the control unit on time
and the ambient temperature rises further to 62 °C, the power supply unit
switches off automatically. The ready contact opens.
When the rho4.0 is switched on, the status LEDs H41 and H43 display
the error cause (see chapter 6).
The CPU-ventilator speed is monitored via the tacho signal of the venti-
lator. If the speed drops heavily or the ventilator stops completely, the
rho4.0 is shut down. If a PHG is connected to the rho4.0 during the shut-
down, the message ’CPU-Fan failed’ appears at the display. This mes-
sage remains displayed until the rho4.0 is switched off or the reset
actuated.
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