Table of Contents
Advertisement
70
Automatic Start
Detection Zone
Electro-Sensitive
Protective Equipment
(ESPE)
LOCKOUT condition
MACHINE RUN
MACHINE STOP
OFF-STATE
ON-STATE
Output Signal Switching
Device (OSSD)
Response Time
Start INTERLOCK
Start/Restart INTER-
LOCK
Upon completion of power-up, the ESPE will enter the
MACHINE RUN state as soon as the detection zone is
clear of opaque objects of the specified size.
The IR light sensing area of the ESPE. When a specified
test piece enters this area then the ESPE must detect its
presence and set its safety outputs to the OFF-state.
An assembly of devices and/or components working
together for protective tripping or presence sensing pur-
poses and comprising as a minimum:
• a sensing device
• controlling/monitoring devices
• output signal switching devices
When the ESPE detects a fault, it transitions to this state.
The OSSD will be held to the OFF-state and the ESPE
will not attempt to leave this state without performing a
comprehensive power up self-test. A power-up self test
will be initiated by either cycling the ESPE power or by a
Start signal transition.
When the ESPE is in this state, the two OSSD are both
active. In this state the Green MACHINE RUN LED is on,
the red MACHINE STOP LED is off and the Yellow
INTERLOCK LED is off.
When the ESPE is in this state, the two OSSD are both
inactive. In this state the Green MACHINE RUN LED is
off, the Red MACHINE STOP LED is on.
The state in which the output circuit is interrupted and
does not permit the flow of current.
The state in which the output circuit is completed and per-
mits the flow of current.
The safety output of the ESPE that is used to enable and
disable the guarded machine.
The maximum amount of time required for the ESPE to
set its OSSD outputs to the OFF-state once the detection
zone is blocked by an opaque object of the specified size.
Upon completion of power-up, the ESPE must go to the
"INTERLOCK" state. A Start signal transition must occur
before going to MACHINE RUN for the first time. Once the
first Start condition has been met, the ESPE will operate
in the Automatic Start mode.
The ESPE will go into the INTERLOCK state upon com-
pletion of power-up and during zone violations which
causes a transition to the MACHINE STOP state. A Start
signal transition must occur before returning to MACHINE
RUN following any transition to MACHINE STOP.
SECTION 15
Glossary
Advertisement
Table of Contents
