Hi all, a new member and my first post.
I got here trawling through the web looking for information on a Stamford alternator that a good friend built into a nice compact Kubota gen-set.
My friend did a good job overhauling the engine, the alternator was bought-in as 'overhauled', and my task is to get the electrics to work.
When first completed, the gen-set worked fine under test, then the EDIC motor controlling throttle position failed with intermittent internal limit switch (contact disc) problems.
It took a while to get the EDIC straightened out, but now we have output voltage above maximum limits.
The unit is: Stamford Type D8A, No. D53367/9, 5 kVA, 415 V 50 Hz, Excitation 155 V 1.15 A.
It appears to be a transformer regulated type.
The phases come off the rotor via brushes, and then (apparently) drive the transformer.
There is a diode bridge feeding the excitation on the stator.
At no-load, phases are about 250/245 to N (240 V required) with excitation about 70 V 0.7 A.
With a load, voltage goes up to 270/255 V, with excitation about 95 V 0.9 A.
I have tested the 4 diodes as OK and experimented with resistors in series with the excitation.
There are 4 studs that could be taps on the transformer as the bridge is connected to one of them.
I have experimented with moving the bridge to other studs.
Cannot make sense of it at the moment.
Can anyone point me to a wiring diagram and/or description of this alternator ?
Thanks in advance for any help,
John.
I got here trawling through the web looking for information on a Stamford alternator that a good friend built into a nice compact Kubota gen-set.
My friend did a good job overhauling the engine, the alternator was bought-in as 'overhauled', and my task is to get the electrics to work.
When first completed, the gen-set worked fine under test, then the EDIC motor controlling throttle position failed with intermittent internal limit switch (contact disc) problems.
It took a while to get the EDIC straightened out, but now we have output voltage above maximum limits.
The unit is: Stamford Type D8A, No. D53367/9, 5 kVA, 415 V 50 Hz, Excitation 155 V 1.15 A.
It appears to be a transformer regulated type.
The phases come off the rotor via brushes, and then (apparently) drive the transformer.
There is a diode bridge feeding the excitation on the stator.
At no-load, phases are about 250/245 to N (240 V required) with excitation about 70 V 0.7 A.
With a load, voltage goes up to 270/255 V, with excitation about 95 V 0.9 A.
I have tested the 4 diodes as OK and experimented with resistors in series with the excitation.
There are 4 studs that could be taps on the transformer as the bridge is connected to one of them.
I have experimented with moving the bridge to other studs.
Cannot make sense of it at the moment.
Can anyone point me to a wiring diagram and/or description of this alternator ?
Thanks in advance for any help,
John.