Viessmann VITOCAL 300 Installation And Service Instructions Manual page 129

Phase monitor
(cont.)
Version 2
A Over/undervoltage in %
B Switching delay in s
C Phase asymmetry in %
D Green LED
E Yellow LED
Relay switch contacts for activat-
ing signalling equipment or for
blocking the heat pump:
LEDs explained
& LED "R" illuminates green:
All voltages and the rotating field
(clockwise) are healthy.
& LED "Ph" flashes yellow:
The relay has responded; the rotat-
ing field is anti-clockwise.
& All LED's off:
One or several phases has/have
dropped out.
& LED "U" flashes yellow:
Undervoltage on one/several phase
(s).
& LED "U" illuminates yellow:
Overvoltage on one/several phase
(s).
& LED "Asy" illuminates yellow:
Incorrect voltage on one/several
phase(s).
Components
129