Droop Parallel Operating Mode (Manual Parallel); Accessory Input (Automatic Parallel); Controller Lamp Display (Diagnosis) Functions - Doosan V158TI Operation & Maintenance Manual

Droop Parallel Operating Mode (Manual Parallel)

• Definition of droop: A reduction in the speed setting following an increase in the load
(No Load Speed - Full Load Rated Speed) 100
DROOP(%) =
•
• Purpose of droop: Droop is used with the purpose of load sharing in the parallel operating system among
generators.
• If there is no droop function in the parallel system, the generator may overload or motorize.
• Applying droop: In order to use droop, turn on the droop selection switch connected to terminals K-L.
• When in droop mode, the speed decreases due to an increased load, but you can use the "Droop" poten-
tiometer (7) to determine the amount (%) of droop.
IMPORTANT
Turning it clockwise increases the amount of decrease. (Increases the amount (%) of droop)
The amount of droop generally used is less than 10%. In order to maintain stability in speed
droop governors, the minimum amount of droop required is at least 2.5%. The value of the
rated speed already set based on the adjusted amount of droop can change so check the
engine speed and readjust the speed as necessary.

Accessory Input (Automatic Parallel)

• Accessory terminal N receives signals from the load sharing unit, auto synchronizer or other accessories
in the governor system.
• Use shielded wires when connecting wiring.
• The engine speed drops when an accessory is connected to terminal N so the speed adjustment potenti-
ometer must be reset.
• When the control device is operating at the maximum acceptable frequency, a jumper or frequency trim
control may be required between terminals G and J. When using this device, the acceptable frequency
range of speed control is increased to over 7,000 Hz.

Controller Lamp Display (Diagnosis) Functions

• Power : The lamp turns on when a battery power supply is connected and an internal control voltage
(DC 12V) has been generated. This means that the main controller is running.
• Pick Up : The lamp turns on when the magnetic speed sensor signal entering terminals C-D is over
AC 3.0V.
• Crank : The lamp turns on and the relay activates when the set rated speed (crank speed) is
reached.
• Run : The lamp turns on and the relay activates when the set rated speed (run speed) is reached.
• Overspeed : When the engine speed reaches the set overspeed, the lamp turns on, the relay activates
and the actuator output is blocked.
Full Load Rated Speed
*
- 25 -