Atlas Copco QAS 14 Instruction Manual page 56

Dual voltage (2V)
The dual voltage option is only
!
available on 50 Hz
Qc1002™ controller.
1 phase - 3 phase
The generator can run in two different modes:
1 phase, lower voltage
When using this selection, the generator provides a
230 V output voltage.
3 phase, higher voltage
When using this selection, the generator provides a
400 V output voltage.
S2
H0
P4
V
500
400 A
300 40
200
20
100
0 0
S4
Qc 1002
145
V
R12
R12
Q1.2
Q1.1 ELR Q1.2
Q1.1
Q1.1 N13 Q1.2
Q1.1 .... Circuit breaker for low voltage, high
current
Interrupts the low voltage power supply
units with
towards X1 when a short-circuit occurs at
the load side or when the overcurrent
protection (QAS 14: 40 A, QAS 20: 63 A) is
activated. It must be reset manually after
eliminating the problem.
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 (QAS 14: 20 A, QAS 20: 32 A) is
activated. It must be reset manually after
eliminating the problem.
R12 ..... Voltage adjustment
Allows to adjust the output voltage.
P3
80
!
S20
Depending on which mode the generator is running
F10
in, circuit breaker Q1.1 or Q1.2 will be operational.
Circuit breakers Q1.1 and Q1.2 cannot be switched on
at the same time. This is prevented by means of
auxiliary voltage selection relays K11 and K12 (refer
to circuit diagram 9822 0992 73/01).
AMF operation is not possible with a
dual voltage generator.
- 56 -
The selection between the two modes is done by
means of S10.
S10...... Output voltage selection switch
Allows to select a 3 phase high output
voltage or a 1 phase low output voltage.
Selector switch S10 is located on the
alternator.
Changing the output voltage is only
!
allowed when the unit has stopped.
After changing the output voltage by
means of the selection switch S10,
adjust the output voltage by means of
potentiometer R12 to the required
value.