ABB 5SXE05-0152 3BHB003023P201 IGCT card

The control must be tuned to each system for optimum performance. The potentiometers for setting and adjusting these circuits are located in the upper right corner of the control as shown in Figure 4-2. They include:• The RATED SPEED potentiometer, adjusted so the converter-speed voltage and the reference-speed voltage are equal at the desired operating speed. 

• The LOW IDLE potentiometer, adjusted so the reference voltage is correct for the desired idle speed. 

• The START FUEL LIMIT potentiometer to provide a means of limiting the fuel-rack position when starting diesel engines. Adjustment of the potentiometer sets the maximum actuator position from no speed until the speed control calls for a fuel setting lower than the setting of the start-fuel limit. The limit is automatically placed in the circuit whenever the speed monitor input declines below the Failed Speed Signal level. Setting the Start Fuel Limit potentiometer full cw will raise the limit above the maximum fuel position, making the limit non-effective.

Failed Speed Signal Circuit 

A failed-speed-signal circuit monitors the speed-signal input. When no signal is detected, it calls for minimum fuel. The minimum-fuel signal is sufficient to cause the actuator to go to the minimum position. Incorrect linkage adjustments or other restrictions in the external system may prevent prime-mover shutdown. For controls with actuator current of 20 to 160 mA, minimum fuel is defined as: • Actuator current of less than 10 mA for forward-acting controls. • Actuator current greater than 180 mA for reverse-acting controls. For controls with actuator current of 40 to 320 mA, minimum fuel is defined as: • Actuator current of less than 20 mA for forward acting controls. • Actuator current of more than 360 mA for reverse-acting controls.

A contact to override the failed-speed-signal circuit can be connected in series with terminal 4 and low voltage dc power. (This power is available on terminal 2 for units supplied with 10 to 40 Vdc power and from terminal 6 on those units supplied with about 120 V ac or dc power.) Temporarily closing the contact overrides the failed-speed-signal circuit as required for start-up.

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