Enabling button
The HT 8 has two enabling buttons that are logically grouped.
This allows the enabling function to be triggered by either the left or the right hand during
normal operation.
The enabling buttons are configured as 2-channel, 3-position switches for the following button
positions:
● Released (no activation)
● Enabling (center position) - enabling for channel 1 and 2 is on the same switch.
● Panic (completely pushed through)
Note
Monitoring the enabling function
● The enabling duration is monitored to avoid that the enabling button is permanently
bypassed. The enabling outputs are opened after max. 30 min permanent enabling. The
enabling outputs are only closed again after first releasing the enabling button and then
actuating it again. The enabling time of 30 min can be extended by switching to the second
enabling button before the 30 min expires.
● The system checks the synchronism of the two enabling button circuits of the mechanical
enabling button. The two enabling button circuits (of the button) must be closed within 2
seconds. As a consequence, it is not possible to actuate just one enabling circuit and
therefore provoke a fault.
The signals are sent via the connecting cable to the terminal box or the connection module
and are available for further wiring.
Connection examples of the enabling and emergency stop button can be found in Chapter:
"HT 2", Section: "Connections" → "Connection examples of enabling button and emergency
stop button"
Handwheel
The HT 8 is available with a handwheel.
The handwheel operates with 50 pulses/revolution.
HT 8 operated with the handwheel
An HT 8 with a handwheel behaves in the same way as an MCP 483C PN (in Ethernet mode)
with a handwheel. The handwheel pulses are transferred via Ethernet to the NCK using the
HT 8 MCP process image.
NOTICE
Lack of care for traversing can cause damage to the tool/workpiece
The increments per revolution for a handwheel on a mobile HT 8 amount to 50 increments/
revolution; for a stationary unit, it is 100 increments/revolution. A different length of the
traverse path results from this difference.
Operator control and display elements
3.2 Description
Handheld Terminal HT 8
98 Manual, 07/2015, A5E36371621B-AB
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