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737-300/400/500MAINTENANCE MANUAL
 ~............................................................................... | VSCF Protective Functions | | Table 1 *[1] | ................................................................................. | Protective | Conditions |VSCF opens |Generator| VSCF BIT |Indication | | Function | for Failure |GB and |Field | light on |from the | | | |energizes |opened? | | GCU | | | |"FF" light?| | | | | | | | | | | ................................................................................. |VSCF Failure |Internal problem | Yes | Yes |"VSCF FAULT"| None | |other than | | | *[2] | | | |those listed | | | | | | |below | | | | | | | | | | | | | .................................................................................
 |Failure of  |Missing waveform |  No  | No | None |"LV" light |
 |the voltage  |at "F" lead  |  *[3]  |  |  |  *[6]  |
 |regulator in  |  |  |  |  |  |
 |the GCU to  |  |  |  |  |  |
 |"full off"  |  |  |  |  |  |
 |  |  |  |  |  |  |

 ................................................................................. |Overvoltage |130 | 3 volts | Yes | Yes |"VSCF FAULT"|"HV" light | | | | | *[2] | |& GB open | | | | | | | *[4] | ................................................................................. |Undervoltage |100 | 3 volts | Yes | Yes |"VSCF FAULT"|"LV" light | | | | | *[2] | |& GB open | | | | | | | *[4] | ................................................................................. |Overfrequency |430 | 5 Hz | Yes | Yes |"VSCF FAULT"| GB open | | | | | *[2] | | *[4] | ................................................................................. |Underfrequency|365 | 5 Hz | Yes | Yes |"VSCF FAULT"| GB open | | | | | *[2] | | *[4] | ................................................................................. |Overcurrent |180.5 | 13.5 Amps| Yes | No | None |"FF" light | | *[5] | | | | |& GB open | | | | | | | *[4] | .................................................................................
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 ~...............................................................................
 |  VSCF Protective Functions  |
 |  Table 1 *[1]  |
 |Differential  |25 | 5 Amps  |  Yes  |  Yes  |  None  |"FF" light |
 |Protection  |  |  |  *[7]  |  |& GB open  |
 |  |  |  |  |  |  *[4]  |

 ................................................................................. |Open Phase |<5 | 1 Amps on | Yes | No |"AIRCRAFT | None | | | the low o | | |OPEN PHASE" | | | |>10 | 2 Amps on | | | | | | | the next o | | | | | ................................................................................. |Overheat |177 degrees | Yes | Yes |"VSCF FAULT"|None | | |Centigrade | | *[8] | | | | | | | | | | 2..............….................…...........….........…............…...........1 *[1] VSCF with a two light bit module. *[2] After 2 to 3 seconds, the generator field will connect again. If the VSCF
 can operate, the voltage will go to 5-10 volts; if the VSCF cannot operate,
 the voltage will stay at 0 volts. *[3] The GB stays closed; the voltage goes to 115-120 volts. *[4] The GCU will only do this function if the VSCF does not react first. *[5] The GCU sets the overcurrent protection at 185 |18 Amps. *[6] The GCU energizes the "LV" light after you open the GB by transferring the
　
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