Viessmann Vitocal 300-G Installation And Service Instructions For Contractors page 98

Installation sequence
Power supply
Phase monitor
The phase monitor is used to monitor the
mains power supply to the compressor.
The following different mains supplies (if
adjustable) are permissible in the deliv-
ered condition:
Over/undervoltage
Phase asymmetry
Switching delay
Version 1
10
20
<>U
A
%
2
10
Asy
15
B
%
5
6
4
12
t
C
0.1
12
11
14
L3
L2
L1
A2
A1
98
(cont.)
15 %
15 %
4 s
H
<>U
G
Asy
F
Ph
E
Rel
D
D
The phase monitor switches off (switch-
ing contact opens) if these tolerances
are exceeded.
The phase monitor automatically re-ena-
bles the power supply if the values return
to within the specified tolerance range.
Remove the cause if the relay has
responded. The relay does not need to
be reset.
A Over/undervoltage in %
B Phase asymmetry in %
C Switching delay in s
D Contact used in safety chain (N/O)
E ON/OFF indicator ("Rel")
F Fault display phase failure/phase
sequence ("Ph")
G Fault display asymmetry ("Asy")
H Fault display over/undervoltage
("<>U")
LEDs explained
■ LED "Rel" illuminates green:
All voltages and the rotating field
(clockwise) are healthy.
■ LED "Ph" illuminates red:
The relay has responded; the rotating
field is anticlockwise.
■ 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:
Asymmetry on one/several phase(s).