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Determining Which Hookup Configuration to Use
STOP!
If you are using an optional SEM250A/B or SE350/450 Static Exciter
Module,
DO NOT
use these instructions for hookup! See the instructions that
came with your module instead!
The XR8 Universal Voltage Regulator is configurable for 3 different output ranges suitable for use on the vast
majority of generators available on the market from past and present. It is necessary to choose the proper
mode of operation for your generator in order to get the best regulation and fastest response time possible.
To determine the proper connection for your generator you need to know any two of the following 3
specifications from the rating plate of your generator:
1: Exciter Field Voltage (in DC Volts)
[Generally given in full load Voltage on nameplates]
2: Exciter Field Resistance (in Ohms)
[See Note Below]
3: Exciter Field Amperage (in DC Amps)
[Generally given in full load Amps on nameplates]
Using the specifications obtained from your generator exciter, select a
Connection (A, B, or C) from the chart below:
•
Exciter Field Resistance
≥26Ω
& Exciter Full-Load Voltage
≤125VDC
Use connection
A
(See Page 8)
•
Exciter Field Resistance
≥13Ω
& Exciter Full-Load Voltage
≤63VDC
Use connection
B
(See Page 10)
•
Exciter Field Resistance
≥6.5Ω
&
Exciter Full-Load Voltage
≤32VDC
Use connection
C
(See Page 12)
Note about Field Resistance:
• When measuring field resistance on a brushless generator, simply measure the resistance of the
exciter field through your field leads with a multimeter.
• When measuring field resistance on a brush-type generator, measure the resistance through both the
field leads as well as directly on the slip rings themselves.
The readings you obtain should ideally
be the same, but
no more than 1% difference.
If you show more than 1% difference in reading your
generator has brush and ring contact problems and will need cleaning or maintenance before installing
the XR8.
Failure to correct brush and ring contact problems will result in severe damage to the
voltage regulator as well as possible PERMANENT damage to the slip rings themselves!
NEVER
use emery cloth, carborundum stones, “comm sticks”, or Tuner cleaner to dress or
clean slip rings
. They will make a bad problem much, much worse! Only use Garnet or Flint
sandpaper and clean with a clean rag soaked with Acetone for best results!
