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ODUCT  WA

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Power-Tronics, Inc.

assumes no liability for damages due to incorrect voltage or other voltage

related damages resulting from either output of the generator or input to the generator exciter

system.  These problems should be protected with external devices provided by the customer

such as

 fuses, surge suppressors, over/under voltage and frequency controls.

Power-Tronics, Inc.

warranties 

only parts and workmanship

 of this product for 

a period of

1 year from the original date of purchase from Power-Tronics, Inc. 

  Under warranty,

Power-Tronics, Inc. will replace, exchange or repair the defective product 

without labor or

parts cost to the customer.

  Remaining warranty of the original product will be transferred to

the replaced or repaired product.  To obtain warranty, a copy of the original purchase receipt

must be sent in with the defective product, which clearly shows the purchase date and serial

number of the defective part.  A repair request form must be sent in with the product before

repairs will begin.  You can obtain this form through contacting Power-Tronics, Inc..  Send

repairs to:  Power-Tronics, Inc., 2802 Cobbler Ln., Kerrville Texas USA 78028.  Send in

repairs only by UPS or FedEx.

Any one of the following conditions will void the warranty:

v

 

Overheating of the power supply resistor on the printed circuit card.

v

 

Ove

rheating of the SCR or freewheeling diode.

v

 

Physical damage to the printed circuit card, housing or components.

v

 

Unauthorized repair or alteration of printed circuit card.

v

 

Conductive or corrosive contamination of the circuit card.

v

 

Removal of our company identification from the product.

v

 

Removal of any conformal coating of the printed circuit card or components.

v

 

Overheating of foil on the printed circuit card.

v

 

Inappropriate or infeasible application

v

 

Use on any external device other than manufactured by Power-Tronics, Inc.

No other warranty is expressed or implied.

Summary of Contents for VR758

Page 1: ...z mode and is compatible with most SCR loads such as speed controls and UPS systems Specifications Input Volts 120 or 240acv Frequency 50 or 60hz Voltage Regulation 1 of setting Output Volts 0 52vdc 120vac input 0 105vdc 240vac input Maximum Continuous Output 8adc Minimum Field Resistance 6 5Ω 120vac input 13Ω 240vac input Min Residual Build up Volts 5vac Physical Size 4 75 x 6 x 1 in Weight 6 oz ...

Page 2: ...hich mode that your application will require The charts below will illustrate how each mode operates Volts per Hertz It is desirable to use the VPH mode in some types of the applications listed below v Generator is idled before and after use v Prime mover Hp is not enough for starting large KW loads v Untrained or non professional operators v Misused equipment Flat Response Flat response is genera...

Page 3: ...SE A B C N GENERATOR EXC FLD OFF ON REMOTE V ADJUST VR758 Wiring diagram for 208 240vac hookup For 460 480vac hookup connect to center taps of main windings for 208 240vac input 2 Determine if the application requires the regulator to be VPH or Flat Response mode The regulator is shipped as VPH 3 If the regulator is to be configured as Flat Response remove the jumper located on the circuit card ju...

Page 4: ...ge is steady and the green light is not pulsating During this adjustment be sure to keep the generator voltage within 10vac of the original setting with the internal voltage adjustment 8 Place the generator on line and observe the frequency and voltage Application Troubleshooting Problem Possible Cause No Voltage 1 3 5 7 9 11 13 15 20 Pulsating Voltage 4 5 6 12 16 Flickering Voltage 6 7 14 4 High ...

Page 5: ...12 Wrong selection of regulator wiring configuration 13 Defective voltage regulator 14 SCR or Inverter drive effecting generator wave form 15 Regulator needs external flashing circuit 16 Isolation transformer is too small 17 Isolation transformer is needed 18 Exciter fields are not isolated from other circuits 19 Input and field circuit are being fed by a common cable or conduit 20 Incorrect hooku...

Page 6: ...til the test light turns fully on The bulb will only glow at1 2 brilliance with a 120vac input to the voltage regulator Turn the voltage adjustment counter clockwise until the light turns off 5 Turn the stability adjustment clockwise until the test light turns on then turn the stability control counter clockwise until the test light turns off 6 Momentarily short out the terminals 5 and 6 The test ...

Page 7: ...ng of any product you may be having problems with Product Other options Serial Number Date of Installation Type of Generator Model Brush type Brushless AC Stator Information Wired for Volts Phase Hz Generator Configuration Lead Exciter Rotor Information Exciter field resistance Ω F F Ω Exciter field volts vdc Slip Rings Ω Description of problem with product or generator Your phone number Name Your...

Page 8: ... product which clearly shows the purchase date and serial number of the defective part A repair request form must be sent in with the product before repairs will begin You can obtain this form through contacting Power Tronics Inc Send repairs to Power Tronics Inc 2802 Cobbler Ln Kerrville Texas USA 78028 Send in repairs only by UPS or FedEx Any one of the following conditions will void the warrant...

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