Fronius CL - Page 88

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The Microcontroller Guard (Guard) continually monitors safety-critical functions of the pow-
er stage set main processor (Pinci-DSP): Example: Grid voltage recording to monitor grid
voltage limits, anti-islanding test execution, etc.
450
The monitoring of the power stage set main processor "Guard" is active
Cause: Communication between the Guard and DSP is faulty
Remedy: Remedied automatically
Cause: Guard processor defect
Remedy: Replace affected power stage set
451
Guard EE-PROM defective
Cause: Communication between the Guard and DSP is faulty
Remedy: Remedied automatically
Cause: Guard processor defect
Remedy: Replace affected power stage set
452
Communication error between the Guard and DSP
Cause: DSP and/or Guard defective
Remedy: Replace power stage set
453
Grid voltage error of the Guard detected
Cause: Grid voltage error
Remedy: Check grid voltage
Cause: Measurement error in power stage set
Remedy: Replace power stage set
Cause: Grid voltage outside the limits
Remedy: Check switch-off limits in the Service menu pro
454
Grid frequency error of the guard detected
Cause: Grid frequency error
Remedy: Check grid frequency
Cause: Measurement error in power stage set
Remedy: Replace power stage set
Cause: Grid frequency outside the limits
Remedy: Check switch-off limits in the Service menu