Viessmann VITOCAL 242-G Installation And Service Instructions Manual page 36

Installation sequence
Power supply
(cont.)
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. 33
Over/undervoltage in %
A
Phase asymmetry in %
B
C Switching delay in s
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
LEDs explained in Fig. 33
■ "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
36
H
<>U
G
Asy
F
Ph
E
Rel
D
D
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. 34
LEDs explained in Fig. 34
Voltage "U":
A
■ Illuminates green if voltage is applied.
Relay "R":
B
■ Illuminates yellow if the phase sequence is cor-
rect.
Does not illuminate if the phase sequence is
■
incorrect.