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Version 17
Safe-E-
Stop™
User Guide
The Status LED generally has the following meaning:
Table 9: PSD Status LED General Meaning
G
REEN
Normal operation
O
RANGE
Items of note
R
ED
Action is required to correct a problem
The Haptic feedback (vibration) generally has the following meaning:
Table 10: Haptic Feedback General Meaning
O
NE PULSE
Confirmation
T
HREE PULSES
Warning of an abnormal event
6.4 Normal Operation
Once linked to an MSD, normal operation can commence.
For normal operation all linked PSDs must have their E-Stop switches released, good battery capacity, and be
within a good RF range (typically within 300 feet of the machine, but the distance will vary by environment).
6.4.1 Communication Loss
Moving a PSD out of RF range results in an E-Stop; this is a safety-critical feature to ensure that the E-Stop of a
linked PSD is always available. As this is not ideal, the PSD warns the user if the signal is getting too low by
flashing the RSSI ICON, flashing the status LED red, (requiring action by the user), changing the COMM LOSS
LED to orange, and vibrating in groups of 3 pulses. The user must move closer to the machine or risk causing an
E-Stop by COMM LOSS.
If a PSD moves out of range and causes a COMM LOSS, both the E-Stop and COMM LOSS safety relays on the
MSD open.
6.4.2 Communication Loss Recovery Stage 1
The PSD causing the COMM LOSS has 30 seconds to move back into RF range, after which the user can press
the ‘|’ button on the PSD to recover the MSD operation. The machine will still need to be reset.
6.4.3 Communication Loss Recovery Stage 2
If the PSD is not moved back into range within 30 seconds, a full COMM LOSS is enforced. All PSDs unlink and
an MSD reset will be required by pressing a button that is wired to the MSD COMM LOSS reset switch safety
inputs. Afterwards, all PSDs will need to relink to rejoin the operation, and the machine will need to be reset.
This process makes it possible to recover from a PSD that has, for instance, been accidentally removed from site
without de-linking.
As part of the recovery process, it is important that all users are accounted for.
6.4.4 Issuing an E-Stop
In normal operation, the E-Stop switch can be pressed at any time. This results in the MSD E-Stop Safety Relays
opening within 500mS, bringing the machine to a safe state. Note that the MSD COMM LOSS relays remain
closed.
The PSD issuing the E-Stop will have the Status LED flashing red and the display will show ESTOP. The PSD will
vibrate three times.
