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7.4
Behavior in the event of a fault
7.4.1
Power failure
After failure of the supply voltage, the device is switched off. When the supply returns, the
device is ready for operation again (see also the "Power-up (Page 16)").
7.4.2
Internal error
The device LED shows a red light in the case of an internal fault in the device. The device
must be replaced and repair is not possible.
An internal fault is a fault the user can no longer correct.
7.4.3
Sensor fault
7.4.3.1
Position switch protective door
When the position switches are opened, contacts P1 and P2 must be opened within
t < 0.5 s. If simultaneity is not satisfied, a diagnostics message appears on the display. After
correction of the fault, it is necessary to perform a reset (see Troubleshooting) or a restart by
switching the supply voltage off and on.
Both position switches must be closed to start output contact 23/24.
If only single-channel or two individual single-channel position switches are to be connected
for a lower category, detection of simultaneity must be disabled in the menu. Terminals T2
and P2 must be jumpered when using a single-channel position switch. If no position
switches are used, terminals T1 must be jumpered with P1, and terminals T2 with P2.
7.4.3.2
Speed sensor
If the speed sensor fails (encoder or initiators defective), the device switches to the safe
state (outputs are switched off).
A restart or reset is necessary following correction of the fault.
3TK2810-1 safety-related speed monitor
System Manual, 01/2011, 926246402000 DS 02
Diagnostics/troubleshooting
7.4 Behavior in the event of a fault
57
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