Overview
An enabling device is a manually operated control device which, when continuously activated and used in conjunction with a separate
actuating (start) control, will allow the machine to function in manual operating mode (e.g. inch/jog, slow speed, not automatic/production
mode).
The enabling device
permits
(i.e., enables) the machine to run,
but does not start the cycle;
a separate signal is needed
to start the hazardous motion.
Sometimes called the "live man pendant," the enabling device must initiate an immediate stop of the
hazard when released or fully squeezed by the operator.
In operation, the operator holds the three-position switch and presses lightly but firmly to enable the machine to run (position 2). In posi-
tion 1, the switch is not activated, and in position 3, the switch is pressed beyond the enable position. In positions 1 and 3, the switch
opens contacts 1-2 and 3-4, which removes power from the machine control, stopping the machine. Releasing the switch from position 3
to position 1 will not reclose the safety outputs until the switch is actuated from position 1 to position 2.
Models with the momentary switch may be used to control a machine function, such as an inch/jog button, or a hold-to-run control. Hold-
to-run control initiates and maintains machine function only as long as the manual control (actuator) is actuated.
For hold-to-run applications, both the three-position switch and the normally open momentary switch must be continually engaged to
allow machine operation. If multiple individuals are exposed to the hazard, only a single individual can be in command of the hold-to-run
control or other means of starting the machine function or cycle.
All individuals within the hazard area must be provided their own
enabling device or otherwise be safeguarded.
Each enabling device must be concurrently operated before machine motion can be
initiated.
The enabling device is not considered to be an emergency stop device, but if performing an emergency stop function or if interfaced with
the emergency stop circuit, the installation must comply with ANSI NFPA 79, IEC 60204-1 or the relevant regulations/standards. Emer-
gency stop device(s) must be continuously operable and readily accessible, and must not be muted or bypassed.
Only qualified and authorized personnel who have been trained in the use of the device, and hazards associated with the task requiring
the use of the device, may be allowed to operate the enabling device. Safe work procedures must include, but are not limited to, the use
of the device, the associated hazards, and the task requiring the use of the device.
The enabling device must control all hazards that can be accessed by the individual operating the device.
Care must be taken
that additional hazards that can be created by the machine's function are controlled and that the individual is aware of these additional
hazards, for example: the actuation of the enabling switch and the hold-to-run command causes the movement of a workpiece that cau-
ses a part-position sensor to index another workpiece that may not be within the individual's field of view. This situation could result in the
individual being struck by the indexing workpiece.
The means to return the machine to production mode must be located outside of, and out of reach from within, the hazardous area, and
be guarded against unintended operation. In addition, the reset switch operator must have full view of the entire guarded area and verify
that the area is clear of individuals during the reset procedure.
Models ED1G-L21SM-1N and ED1G-L21SMB-1N
Model ED1G-L20MB-1N
Figure 1. Contact status when grip switch is operated
ED1G Enabling Switch
P/N 151822 Rev. B
www.bannerengineering.com - tel: 763-544-3164
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