Viessmann Vitocal 300-G Installation And Service Instructions Manual page 99

Power supply
(cont.)
A Over/undervoltage in %
B Phase asymmetry in %
C Switching delay in s
D Contact used in the safety chain
(N/O)
E Operating display ("Rel")
F Fault display phase failure/phase
sequence ("Ph")
G Fault display asymmetry ("Asy")
H Fault display over/undervoltage
("<>U")
Installation sequence
LEDs explained
LED "Rel" illuminates green:
All voltages and the rotating field
(clockwise) are healthy.
LED "Ph" illuminates red:
The relay has responded; the rotat-
ing field is anti-clockwise.
All LED's off:
One or several phases have
dropped out.
LED "<>U" illuminates red:
Incorrect voltage on one/several
phase(s).
LED "Asy" illuminates red:
Incorrect voltage on one/several
phase(s).
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