YORK YK — Low Frequency Fault

The panel shows Low Frequency Fault. The manual lists no other wording for this message — this is the only variant.

This fault is declared when the VSD speed remains below the minimum speed longer than the allowed VSD Low Frequency Fault Time. The panel watches how long the VSD runs below its minimum speed, and the fault appears as soon as that time exceeds the limit the panel allows. Which limit applies depends on the Power Fault Recovery Control feature: with it enabled, the panel uses the adjustable VSD Low Frequency Fault Time; with it not enabled, that setting has no effect and the fixed standard time of 25 seconds applies instead.

• VSD speed below the minimum speed for longer than the VSD Low Frequency Fault Time — this is the only cause the manual gives for the message.

1. Open the Power Fault Recovery screen and press Button 8 to display the VSD Low Frequency Fault Time. The value is visible in view mode, but only editable in Admin access level and above.
2. Check whether Power Fault Recovery Control is enabled. When it is not enabled, the setting has no effect and the fault is based on the standard time of 25 seconds instead of the adjusted value.

• VSD Low Frequency Fault Time — located on the Power Fault Recovery screen, Button 8.
• Adjustable from 60 sec to 120 sec, with a default of 60 sec.
• Visible in view mode, but only editable in Admin access level and above.
• On the Power Fault Recovery screen the setting is listed together with its mode, low limit, high limit and default.
• The setpoint has also been added to the Setpoints report and the History log in the MVVSD section.
• When Power Fault Recovery Control is not enabled, the setting has no effect and the standard time of 25 seconds applies.