Atlas Copco QAS28 Yd(S) - Dual Voltage (DV) Option Configuration; High;Low Voltage Connection and Circuit Breakers

QAS28 Yd(S), QAS28 YdS IT
26
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The "Dual voltage" option allows to select a high (3-phase, e.g.
400 V) or a low (3-phase, e.g. 230 V) output voltage.
Q1.1 .. Circuit breaker for low voltage, high current
Interrupts the low voltage power supply towards X1 when a
short-circuit occurs at the load side or when the overcurrent
protection (63 A) is activated. It must be reset manually after
eliminating the problem and after each start.
Q1.2 .. Circuit breaker for high voltage, low current
Interrupts the high voltage power supply towards X1 when a
short-circuit occurs at the load side or when the overcurrent
protection (40 A) is activated. It must be reset manually after
eliminating the problem and after each start.
R11.... Output voltage adjust potentiometer
Allows to adjust the output voltage.
Circuit breakers Q1.1 and Q1.2 cannot be switched on at the same
time. This is prevented by means of the auxiliary voltage selection
relays K11 and K12 (refer to the circuit diagram).
The selection of high or low voltage is done by means of connec-
tions on the terminal board of the alternator.
To select high voltage, connect the terminal board as fol-
lows:
To select low voltage, connect the terminal board as fol-
lows:
After changing the output voltage, adjust the output voltage by
means of potentiometer R11 to the required value.
Changing the output voltage is only allowed after
shutdown.
S2
X1
L1 L2 L3 N
PE
I
ME
0
200
100
500
300
400
V
60/5A
I
ME
0
20
60
40
L3
A
60/5A
I
ME
0
20
60
40
L3
A
60/5A
I
ME
0
20
60
40
L3
A
I
ME
55
65
50
45
60
RPM
Hz >
000001 h
QUARTZ
HOUR
Q1.1 Q1.2
U
R11
!
The dual voltage option cannot be combined with
the sockets option because the sockets may not be
used at low voltage.
2-3 6-7 10-11
1 5 9
L1 L2 L3
4-8-12
N105 109 PE
2-4 6-8 10-12
1-3 5-7 9-11
L1 L2 L3 N105 109 PE
!