Pilz PSS SB HYD, Basic license - Manual (Page 37)

4-7 Modular Block System: Hydraulic Presses
INFORMATION
Input circuitry:
• To achieve category 4, two independent shutdown routes must be
provided within the current path of the potentially dangerous drive
• If wiring is to be laid outside the control cabinet, feedback loops must use
test pulses.
• Feedback loops must use test pulses if the possibility of a short-circuit
cannot be excluded.
• If only one contactor is used to switch a potentially dangerous drive, it
must be possible to switch this off via a group contactor within the
current path (selective shutdown).
• The group contactor must also be monitored through a feedback loop.
SB066: Safety gate monitoring
SB066 is designed for monitoring a safety gate. It can monitor a safety
gate with one or two switches.
SB066 meets all the requirements of category 4, in accordance with
EN 954-1, 03/97.
Operating modes:
• Automatic restart
• Automatic start when PSS starts up
Start-up reset when PSS is cold-started
• No function test on the gate
(function test = opening and closing the gate)
INFORMATION
Input circuitry:
• Inputs should have pulsed outputs