Siemens CU240S DP-F - Page 328

Functions
8.18 Fail-safe functions
Control Units CU240S
8-132 Operating Instructions, 11/2006, A5E00766042B AA
Case 1: Frequency setpoint > SLS monitoring
Initiation of SLS =>
• SLS monitoring activated
• Frequency setpoint deactivated
• SLS-, STO- and SS1-LED off
• LSTO is triggered
Deactivation of SLS =>
• SLS monitoring off
• SLS-LED off
• To start again, LSTO must be
acknowledged and a new on command
is necesarry to ramp up to frequency
setpoint.
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