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Press module Type IH04E | System design and installation
During operation
In case of loss in the
energy supply
Bosch Rexroth AG, Edition 09.2022, RE 63129-MON
6�4 Electrical control system
In order to realize the required safety functions, a safe electrical control system
is furthermore required. The safe electrical control system must also meet
the requirements of the relevant standards, e.g. EN ISO 13849 and 16092,
and possibly other applicable standards.
The safe electrical control system must ensure the functions described in the
following sections.
6�4�1 Safe separation from the energy supply
▶ Ensure that the solenoids of the valves .142, .147 and .170 are safely separated
from the energy supply when a cylinder motion would be dangerous.
6�4�2 Emergency stop
▶ Ensure that the solenoids of the valves .142, .147 and .170 are safely separated
from the energy supply during the emergency stop.
In this case, Bosch Rexroth recommends that all other valve solenoids be
de-energized.
▶ Ensure that an emergency stop is triggered when the energy supply is lost
(electrical voltage supply, control voltage, hydraulic pressure supply or
pilot oil supply).
This prevents an unexpected start when the energy supply is switched
on again.
6�4�3 Safety-related function "Safe reduced velocity"
▶ For the safety-related function "Safe reduced velocity", ensure that the solenoid
of the pilot valve .142 is disconnected from the power supply by a control with
two monitored safety channels.
6�4�4 Evaluation of the limit switch signals of the monitored valves �140 and �145
▶ Ensure that the electric control system evaluates the limit switch signals of
the monitored valves .140 and .145 to detect faults. This includes:
– Testing of the correct function at least once per cycle
– In case of a fault, triggering an emergency stop at the latest at the end of
the cycle
– Switching of the valves in automatic mode only if the danger zone is protected
by the safety equipment.
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