Functions
8.18 Fail-safe functions
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-123
Case 5.2: Frequency setpoint > SLS monitoring (p9691/p9891) secondary fault
Initiation of SLS =>
• Ramp monitoring activated
• SLS-LED flashing
• Frequency setpoint deactivated
• Ramp down with SS1 to standstill
detection
When actual frequency runs
above SS1 ramp down
monitoring before standstill
detection is reached
• Frequency setpoint inactive
• LSTO activated immediately
Deactivation of SLS =>
• No action
• To start again, LSTO must be
acknowledged and a new on command is
necesarry to ramp up to frequency
setpoint.
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