The serial number(s) of the recording meter(s)
Generator set identification
The recording chart speed(s)
The data reading number.
Place all instrumention referred to in paragraph 16-15b in operation.
Start and operate the generator set and allow the set to stabilize at rated load, rated voltage, and
rated frequency. During this period operate the recording meter(s) at a chart speed of not less than 6
inches per hour, and record all instrument readings including thermal instrumentation at minimum
intervals of 10 minutes. If necessary, adjustments to the load, voltage and frequency may be made
to maintain rated load at rated voltage and frequency. Adjustments to the voltage and frequency
shall be limited to those adjustments available to the operator, specifically adjustments to the voltage
or frequency adjust devices. On sets utilizing a droop-type speed control system as the prime speed
control the speed and droop portions of the control may be adjusted. No other adjustments to the
voltage and frequency control systems shall be made. Adjustments to load, voltage, or frequency
controls shall be recorded on both the data sheet and the recording chart(s) at the time of an
adjustment. Stabilization shall be considered to have occurred when four consecutive voltage and
current recorded readings of the generator (or exciter) field either remain unchanged or have only
minor variations about an equilibrium condition with no evident continued increase or decrease in
value after the last adjustment of the load, voltage or frequency has been made.
After stabilization has occurred, drop the load to no load and reapply rated load in 50 percent load
increments a number of times (three should be sufficient) to ensure that the no load and rated load
voltage and frequency are repeatable and that the frequency and voltage regulation is within the
limits specified in the procurement document. If any adjustments are necessary, paragraph (a) must
be repeated. Reapply rated load.
The recording meter chart speed(s) shall be 12 inches per minute throughout the remainder of this
test. At each of the following load conditions (one step) operate the set for a minimum of 40 seconds
(or the short terms stability period plus the allowable recovery time as specified in the procurement
document). During each load condition read and record all instrument readings except termal
instrumentation (for three-phase sets it is