Safety Equipment - Bosch Rexroth WS200 Operating Instructions Manual

14/92 Safety instructions
2.9
To protect people, the WS200 work station is equipped with the following

safety equipment:

• EMERGENCY OFF pushbutton (with hydraulic version)
• Motor protection relay (with hydraulic version)
• Fuse protection of the electr. switching contacts (with hydraulic version)
• Hydraulic pressure limitation
• Quick-release coupling
• Mechanical safeguards
The facilities set out are described in more detail below.
At the control box of the WS200 work station, there is an EMERGENCY OFF pushbutton.
EMERGENCY OFF
The EMERGENCY OFF pushbutton has to be pushed in order to prevent dangers for
pushbutton
persons or the work station. Operation of the EMERGENCY OFF pushbutton interrupts the
power supply to the control in the control box and the function of the connected electric
actuators. The hydraulic power unit and thus the hydraulic oil supply are switched off.
In the control box of the WS200 work station, a motor protection relay and a power
Motor protection
contactor are installed. The motor protection relay is used to protect the electric motor
relay
against short-circuit and thus thermal overload. Upon activation, the hydraulic power unit
and thus the hydraulic oil supply are switched off. In case of triggering due to thermal
overload, the hydraulic power unit can only be switched on again after a cool-down phase.
In addition to the motor protection relay function, the circuit arrangement in the control
box has another function. Protection against automatic start-up of the hydraulic power unit
after an interruption in the supply voltage. This may e.g. be the case if the mains plug is
pulled out of the mains socket while the hydraulic power unit is switched on. If this is the
case, the hydraulic power unit can be switched on again by means of the "ON" pushbutton
after the problem has been solved.
To protect the electric switching contact in the control box against welding in case of
Fuse protection
switching contacts excessive currents, a micro-fuse has been installed. The technical data has to be observed
in case of exchange. For details please refer to chap. 10.6, table 36.
The work station may only be operated with a maximum hydraulic operating pressure
Hydraulic
of 60 bar which can be set via the pressure relief valve in the P/T distributor. The safety
pressure limitation
pressure has been pre-set at the factory to 70 bar by means of a pressure relief valve at the
hydraulic power unit.
To monitor the pressure of training circuits during teaching, corresponding pressure gauges
are to be integrated into the training circuit. The machine end-user is responsible for this.
With hydraulic components for training set-ups, quick-release couplings are mounted at the
Quick-release
measuring glass and at the P/T distributor for the hydraulic connection. They prevent
coupling
leakage of hydraulic fluid if this connection is separated.
Bosch Rexroth AG, WS200, DCA_DE_000151/10-2013
Safety equipment