Operation
7
7.1
Times
Start override time t
a
The start override time is used, for example, to bridge the start time of a motor until it has
reached a specific speed. If the parameterized min. setup or automatic speed is not reached
within the parameterized start override time t
a
, the device switches immediately to the safe
state. Contacts 23/24 are opened and signaling output 25 switches off.
The start override executes at restart of the device, when changing from setup to automatic
mode in autostart mode, and in manual start mode every time the on pushbutton is pressed.
However, the requirement for this is always that before starting the start override time, all safety
requirements (position switch, magnet switch, feedback circuit) must be satisfied, with the
exception of the speed. During start override, output contact 23/24 is permanently connected
provided the safety requirements such as position switch and magnet switch continue to be
satisfied.
See also Chapter "Terminals and their functions (Page 31)" in this regard.
Release delay time t
v
The release delay time is the time that elapses until output contacts 13/14 and signaling contact
15 are switched through following a detected standstill.
See also Chapter "Terminals and their functions (Page 31)" in this regard.
Switch-off monitoring time t
f
The switch-off monitoring time is used to check the contactors connected to output
contacts 23/24. If the feedback at RF1 is not available within the parameterized switch-off
monitoring time t
f
after switching off output 23/24, a blink code in the ratio 50/50 is output at
signaling output 25. An error message is also displayed.
After correction of the fault, it is necessary to perform a reset (see Chapter "Troubleshooting
(Page 64)") or a restart by switching the supply voltage off and on.
Verification of response times in the case of safety circuits
When safety equipment is commissioned, steps must be taken to verify that a safety-related
output will switch off within a maximum permissible response time if the input signal changes
at the relevant input.
3TK2810-1 safety-related speed monitor
Equipment Manual, 05/2020, NEB926246402000/RS-AE/007
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