Fronius CL 44.4 Delta Serviceanleitung Seite 88

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:
Remedy:
Cause:
Remedy:
451
Guard EE-PROM defective
Cause:
Remedy:
Cause:
Remedy:
452
Communication error between the Guard and DSP
Cause:
Remedy:
453
Grid voltage error of the Guard detected
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
454
Grid frequency error of the guard detected
Cause:
Remedy:
Cause:
Remedy:
Cause:
Remedy:
86
Communication between the Guard and DSP is faulty
Remedied automatically
Guard processor defect
Replace affected power stage set
Communication between the Guard and DSP is faulty
Remedied automatically
Guard processor defect
Replace affected power stage set
DSP and/or Guard defective
Replace power stage set
Grid voltage error
Check grid voltage
Measurement error in power stage set
Replace power stage set
Grid voltage outside the limits
Check switch-off limits in the Service menu pro
Grid frequency error
Check grid frequency
Measurement error in power stage set
Replace power stage set
Grid frequency outside the limits
Check switch-off limits in the Service menu