Viessmann Vitocal 300-G Installation And Service Instructions Manual page 49

Power supply
(cont.)
Phase monitor (if installed)
The phase monitor monitors the compressor power
■
supply.
■ If the internal tolerance range is exceeded or under-
shot, the phase monitor interrupts the safety chain
via a floating contact. The compressor switches off.
■ The phase monitor automatically re-enables the
compressor power supply if the values return to
within the specified tolerance range. No reset
required.
Note
If the phase monitor has responded, check the power
supply and remove the cause of the fault.
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
Fig. 40
Over/undervoltage in %
A
Phase asymmetry in %
B
Switching delay in s
C
Contact used in safety chain (N/O contact)
D
ON/OFF indicator ("Rel")
E
Fault indicator, phase failure/phase sequence "Ph"
F
Fault indicator, asymmetry "Asy"
G
Fault indicator, over/undervoltage "<>U"
H
H
<>U
G
Asy
F
Ph
E
Rel
D
D
LEDs explained in Fig. 40
"Rel" illuminates green:
■
All voltages and the rotating field (clockwise) are OK.
■ "Ph" illuminates red:
Relay has responded. Rotating field is anti-clock-
wise.
All LEDs off:
■
One or more phases have dropped out.
■ "<>U" illuminates red:
Incorrect voltage on one or more phases
■ "Asy" illuminates red:
Asymmetry on one or more phases
Version 2
N 11 21
L1 L2 L3
L 1
A
L 2
L 1
L 3
L 2
L 1
L 3
L 2
B
L 3
12 14
22 24
Fig. 41
LEDs explained in Fig. 41
Voltage "U":
A
Illuminates green if voltage is present.
■
Relay "R":
B
Illuminates yellow if the phase sequence is cor-
■
rect.
■ Does not illuminate if the phase sequence is
incorrect.
Installation sequence
49