Re: Re: Re: Voltage regulator, is there any easy way to check it?

Posted by Bob M on August 13, 2001 at 18:43:21 from (66.66.72.246):

In Reply to: Re: Re: Voltage regulator, is there any easy way to check it? posted by dick on August 13, 2001 at 14:44:45:

OK Dick - Here's a quick procedure to test essential regulator functions for a 2-element (consisting of a cutout relay and combined voltage/current relay) regulator. All voltages are for a 6 volt regulator - they are doubled for a 12 volt:

CUTOUT RELAY TEST -

1 - Connect the variable voltage power supply positive to the regulator base and negative to the ARM terminal.

2 - Starting at 0 slowly increase power supply voltage. Note when the cutout relay (the relay with the switch contacts held OPEN by the spring) pulls in. This should happen between 8 and 9 volts.

3 - Now slowly decrease the voltage and note when the cutout drops out. It should drop back out at around 5 volts.

You can mess with the relay spring a bit to change the relay pull-in and drop-out settings if it's out of spec, but it's kinda fussy to get right. Better to simply replace with a new regulator.

VOLTAGE REGULATOR RELAY TEST -

1 - Leave the power supply connected as above. Connect an ohmmeter between the FLD terminal and the regulator base. With the power supply at 0 volts the ohmmeter should 0 (or a couple tenths max) ohms.

2 - Slowly increase the power supply voltage andnote when the ohmmeter reading "jumps" and indicates several ohms. This should happen with the power supply at about 7.2 to 7.5 volts. This is the "voltage regulation" point. Now slowly decrease the power supply voltage - the ohmmeter should return to near 0 ohms when the supply voltage has dropped a couple tenths of a volt.

The voltage regulation point can be adjusted somewhat by changing the tension on the regulator relay spring. Increasing spring tension INCREASES the voltage regulation point. Go easy however - a little change in spring tension causes a large change in voltage.

Testing the current regulating function of a 3 element regulator (has separate voltage and current regulating relays) requires additional test gear: A power supply capable of suppling in excess of maximum generator amp output, and a variable resistance load capable of absorbing this current. If you suspect a problem here best strategy is again to simply replace the regulator with a new one.

Hope this makes sense! ...Bob M

Follow Ups:

• Re: Re: Re: Re: Voltage regulator, is there any easy way to check it? dick 13:36:12 08/14/01 (1)
  • Re: Re: Re: Re: Re: Voltage regulator, is there any easy way to check it? Sven 20:36:17 08/14/01 (0)

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