ABB 3HAC17396-1 Drive input module

All Units To verify correct system operation after installation and any time trouble occurs, do the following checks in the order given. Disconnect all accessories. Leave the IDLE/RATED switch or jumper connected. On isochronous EPGs, jumper terminal 7 to terminal 8, and terminal 11 to terminal 12. On EPGs with droop, leave terminals 9, 10, 11, and 12 disconnected with CT and PT wires properly secured for safety. On EPGs with dual dynamics, leave terminals 7 and 8 open to select primary (fast) dynamics.

Be prepared to make an emergency shutdown when starting the engine, turbine, or other type of prime mover, to protect against runaway or overspeed with possible personal injury, loss of life, or property damage.

Verify: 

• MPU voltage between terminals 5 and 6 at least 1.5 Vrms while cranking? (For small gears, it may be necessary to decrease the MPU clearance). Do not decrease below 0.25 mm (.010 inches). • Actuator should go to maximum fuel position when the starter turns engine or turbine. (If applicable, Start Fuel Limit must be fully clockwise.) • When the engine or turbine starts and comes to speed, the actuator arm should move toward minimum-fuel position. 11. Adjust the GAIN pot to the stable region between low-frequency and highfrequency oscillation. 12. If there is a low-frequency oscillation which does not stop when the GAIN pot is adjusted, turn the STABILITY pot slightly clockwise and try the GAIN pot adjustment again. Continue adjusting the STABILITY pot slightly clockwise, then readjusting the GAIN pot, until the engine runs at a steady speed. If there is a high-frequency oscillation which will not stop, even when the GAIN pot is fully counterclockwise, adjust the STABILITY pot slightly counterclockwise until the high-frequency oscillation stops.

Speed Settings 

Adjust the RATED SPEED pot for the desired rated speed. 14. Set the IDLE SPEED pot for the desired idle speed. 15. Close the IDLE/RATED switch. 16. Adjust transient response. Simulate a transient by manually bumping the linkage. To decrease settling time (may increase ringing) after a transient, turn the GAIN pot clockwise slightly, then turn the STABILITY pot as required to eliminate oscillation and to obtain desired response. Repeat if necessary.

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