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Home›Repair guides›Service procedure for KR4FFX and KR7FFX.pdf

Basler Electric KR4FFX/FFMX and KR7FFX/FFMX — Service procedure for KR4FFX and KR7FFX.pdf

For the Basler Electric KR4FFX/FFMX and KR7FFX/FFMX.

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Procedure

  1. The light bulb should be 120 Vac with a wattage reading below 200 W. Step 3. Adjust the External Voltage Adjust Rheostat for maximum resistance (fully counter- clockwise). Step 4. Connect the regulator to a 120 Vac, 60 Hz. source. Note that the light bulb will flash momentarily when the voltage is applied. Step 5. Slowly adjust the External Voltage Adjust Rheostat toward minimum resistance (CW). Before reaching full CW rotation, the light bulb should come on to near full brilliance. If the light bulb(s) do not illuminate, the regulator is defective. Step 6. At the regulating point, a small change in the External Voltage Adjust Rheostat should turn the light bulb on or off. Step 7. This test may not reveal a stability problem. Step 8. Before installing the regulator back into the system, connect the regulator sensing transformer back to the original tap selected. Troubleshooting Chart Common generator system malfunctions and the appropriate repair procedures are listed in the following paragraphs. Voltage Does Not Build up to Rated Value Step 1. Check for low residual voltage (less than 6 volts). If low residual voltage exists, flash the field in accordance with Field Flashing. If residual voltage is normal, proceed to Step 2. Step 2. Check that Shutdown Switch is closed and that fuses are intact. If Shutdown Switch is closed and fuses are intact, proceed to Step 3. Step 3. Check that prime mover is up to speed. If prime mover is operating at rated speed, proceed to Step 4. Step 4. Verify that generator output is not shorted or heavily loaded. If output is not shorted, proceed to Step 5. Step 5. Verify that wiring and external Voltage Adjust Rheostat is not defective. If wiring is defective, repair or replace wiring. If rheostat is defective, replace rheostat. If wiring and rheostat are not defective, proceed to Step 6. Step 6. Verify that all wiring is correctly connected at power input terminals 3 and 4 and that input power is of correct value. If power input is low or not present, repair wiring. If power input is present, proceed to Step 7. Step 7. Verify that connections at terminals F+ and F- are correct. If connections are incorrect, repair wiring. If connections are correct, proceed to Step 8. Step 8. Verify that correct sensing tap has been selected. If wrong sensing tap has been selected, reconnect to proper tap. If correct tap has been selected, proceed to Step 9. Step 9. Verify generator/exciter operation. If generator/exciter operation is improper, contact generator/exciter manufacturer. If generator/ exciter operation is proper, proceed to Step 10. Step 10. If the above steps fail to correct the malfunction, replace the voltage regulator. Voltage Builds up and Then Decays Step 1. Check for open circuit from external Voltage Adjust Rheostat. If wiring is defective, repair wiring. If rheostat is defective, replace rheostat. If connections are proper and not defective and rheostat is not defective, proceed to Step 2. Step 2. Replace the voltage regulator. Voltage High and Uncontrollable with Voltage Adjust Rheostat Step 1. Verify that sensing voltage is available at terminals E1 and E3 and that the proper taps are used. If sensing voltage is not available, correct wiring. If sensing voltage is proper, proceed to step 2. Step 2. Replace the voltage regulator. Voltage High and Controllable with Voltage Adjust Rheostat Step 1. Verify that the sensing voltage is available at terminals E1 and E3 and that the proper taps are used. If the sensing voltage is not available, repair wiring. If the sensing voltage is proper, proceed to Step 2. Step 2. Check for defective voltmeter. If voltmeter is defective, replace voltmeter. If voltmeter is not defective, proceed to Step 3. Step 3. If the above steps fail to correct the malfunction, replace the regulator. Poor Stability (Hunting). Step 1. Verify that the frequency is stable. If the frequency is unstable, consult with the governor manufacturer. If the frequency is stable, proceed to Step 2. Step 2. Check the adjustment of the Stability Adjustment (R15). If adjusting the Stability Adjustment does not correct the malfunction, proceed to Step 3. Step 3. Verify that the no-load field voltage is not below rated. If the no-load field voltage is below rated, re
  2. Power matching transformer is required if appropriate input voltage is not available at generator terminals. If field or flashing circuit is grounded, an isolation transformer is also required.
  3. Internal sensing transformer is provided with taps. It is shipped connected to the 120 Volt tap. If voltage other than 120 V is required, connect wire to applicable tap.
  4. The exciter field dc resistance must be at least that listed in the Specifications. If not, a series resistor must be added so that the total resistance is at least this value.
  5. Shutdown switch allows removal of field excitation. If switch is not used, a temporary switch should be installed during initial operation.
  6. The regulator contains an internal relay for voltage buildup. If flashing is required, refer to Field Flashing. If permanent field flashing is desired, connect as shown and limit flashing current to <50% of no-load field current. Diode rating: 15 A, 600 PIV.
  7. Regulator and generator must be grounded. This is pertinent for EMI suppression. If ungrounded, the KR regulator will be electrically hot.

Source: manual:KR4FFX and KR7FFX.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.