PI Manufacturing AC generators - Manual (Page 12)

4.4.2 DIRECTION OF ROTATION
The generator is supplied to give a phase sequence of U V W
with the generator running clockwise looking at the drive end
(unless otherwise specified at the time of ordering). If the
generator phase rotation has to be reversed after the
generator has been despatched apply to factory for
appropriate wiring diagrams.
UCI224, UCI274, UCM224, UCM274
Machines are fitted with bi-directional fans and are suitable for
running in either direction of rotation.
UCD224, UCD274
Machines are fitted with uni-directional fans and are suitable
for running in one direction only.
4.4.3 VOLTAGE AND FREQUENCY
Check that the voltage and frequency levels required for the
generating set application are as indicated on the generator
nameplate.
Three phase generators normally have a 12 ends out
reconnectable winding. If it is necessary to reconnect the
stator for the voltage required, refer to diagrams in the back of
this manual.
4.4.4 AVR SETTINGS
To make AVR selections and adjustments remove the AVR
cover and refer to 4.4.4.1, 4.4.4.2, 4.4.4.3, 4.4.4.4 or 4.4.4.5
depending upon type of AVR fitted. Reference to the
generator nameplate will indicate AVR type (SX460, SX440,
SX421, MX341 or MX321).
Most of the AVR adjustments are factory set in positions
which will give satisfactory performance during initial running
tests. Subsequent adjustment may be required to achieve
optimum performance of the set under operating conditions.
Refer to 'Load Testing' section for details.
4.4.4.1 TYPE SX460 AVR
The following 'jumper' connections on the AVR should be
checked to ensure they are correctly set for the generating set
application. Refer to Fig. 1 for location of selection links.
1. Frequency selection
50Hz operation LINK C-50
60Hz operation LINK C-60
2. External hand trimmer selection
No external hand trimmer LINK 1-2
External hand trimmer required -
REMOVE LINK 1-2 and
connect trimmer across
terminals 1 and 2.
3. AVR Input Selection
High voltage (220/240V) Input NO LINK
Low voltage (110/120V) Input LINK 3-4
Refer to diagram in the back of this manual to determine
wiring.
4.4.4.2 TYPE AS440 AVR
The following 'jumper' connections on the AVR should be
checked to ensure they are correctly set for the generating set
application.
Refer to Fig. 2 for location of selection links.
1. Frequency selection terminals
50Hz operation LINK C-50
60Hz operation LINK C-60
2. Stability selection terminals
Frame UC22 LINK A-C
Frame UC27 LINK B-C
3. Sensing selection terminals
LINK 2-3
LINK 4-5
LINK 6-7
4. Excitation Interruption Link
LINK
K1-K2