Setting functions
8.9 Safe Torque Off (STO) safety function
Converter with control units CU250D-2
246 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Setting the forced checking procedure (test stop)
Procedure
To set the forced checking procedure (test stop) of the basic functions, proceed as follows:
1. Select the advanced settings for STO.
2. Set the monitoring time to a value to match your application.
3. Using this signal, the inverter signals that a forced checking procedure (test stop) is
required.
Interconnect this signal with an inverter signal of your choice.
You have set the forced checking procedure (test stop) for the basic functions.
The forced checking procedure (test stop) of the basic functions is an inverter self test. The
inverter checks its circuits to switch off the torque. If you are using the Safe Brake Relay, for
a forced checking procedure, the inverter also checks the circuits of this component.
You start the forced checking procedure each time that the STO function is selected.
Using a timer block, the inverter monitors as to whether the forced checking procedure is
regularly performed.
Figure 8-52 Starting and monitoring the forced checking procedure (test stop)
p9659
Forced dormant error detection timer
(Factory setting: 8 h)
Monitoring time for the forced dormant error detection.
r9660
Forced dormant error detection remaining time
Displays the remaining time until the forced dormant error detection and testing the
safety switch-off signal paths.
r9773.31
1 signal: Forced dormant error detection is required
Signals for the higher-level control system.
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