Rockwell Automation 937CU-DIFRQ_1 Universal Frequency Converter Installation Instructions - Manual (Page 20)

Bul. 937
C Universal Frequency Converter Installation Instructions
Start-up override
Activation of start-up override and its effect:
•You can activate start-up override with a signal to terminals 13/14 (at least 100 ms).
•Start-up override prevents switch outputs from signalling a limit violation during the configured override
period (start-up phase).
•Start-up override affects only those switch outputs with the MIN switching direction
(Refer to Limit switch). If a switch output has active as its mode of operation, it will remain
de-
energized during the override period. If its mode of operation is passive, it will be forced to remain
energized during the override period (on the mode of operation, Limit switch).
•The start-up override is edge triggered: before it can be triggered again, the signal must be turned off on
terminals 13/14 for at least 200 ms. If a signal interruption occurs and a new signal arrives during the
override period, the timer is restarted.
Pulse suppression:
Using the FDT software (this is not possible with the control panel), you can alternatively select pulse
suppression instead of start-up override.
•If pulse suppression is selected, the universal frequency converter will ignore all incoming pulses, as long
as a signal is present on terminals 13/14. It then behaves for all evaluations as though the start value of the
measurement range is constantly applied.
•If pulse suppression has been selected, start-up override is deactivated. Restart inhibit is also not possible
(Refer to Restart inhibit).
If problems should occur with the start-up override, use the FDT software to check whether pulse
suppression may have been selected.
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