Atlas Copco QAS28 Yd(S) - Dual Voltage with Switch (DV-SW) and Single Phase Options; DV-SW Voltage Selection and Single Phase Operation

INSTRUCTION MANUAL
27
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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.
S10....Output voltage selection switch
Allows to select high output voltage or low 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).
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The "Single phase" option provides single phase output voltage
(e.g. 230 V).
X1 ......Main power supply (230 V AC)
Terminals L1, L2, N (= neutral) and PE (= earthing), hidden
behind the control panel door and behind a small transparent
door.
Q1......Circuit breaker for single phase operation
Interrupts phases L1 and L2 towards X1 when a short-
circuit occurs at the load side or when the overcurrent pro-
tection (40 A) is activated. It must be reset manually after
eliminating the problem and after each start.
Changing the output voltage is only allowed after
shutdown.
After changing the output voltage by means of the
selection switch S10, adjust the output voltage by
means of potentiometer R11 to the required value.
The dual voltage with switch option cannot be com-
bined with the sockets option because the sockets
may not be used at low voltage.
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
OFF
L1-N
L1L2
L2-N
LN
LL
L3L1
L2L3
U
R11
S10
!