................................................................................. |VSCF Fault |Internal problem | Yes | Yes |"VSCF FAULT-| None | |Protective |resulting in a | | *[2] | PROTECT | | |Trip |trip other than | | | TRIP" | | | |those listed | | | | | | |below | | | | | ................................................................................. |VSCF Fault -|Internal problem | No | No |"VSCF FAULT-| None | |Passive |which does not | | | PASSIVE" | | | |result in a trip | | | | | ................................................................................. |Failure of |Missing or steady| No | No | None |"LV" light | |the voltage |waveform at "F" | *[3] | | | *[6] | |regulator in |lead | | | | | |the GCU | | | | | | ................................................................................. |Overvoltage |130 | 3 volts | Yes | Yes |"VSCF FAULT-|"HV" light | | | | | *[2] |PROTECT |& GB open | | | | | |TRIP" | *[4] | ................................................................................. |Undervoltage |100 | 3 volts | Yes | Yes |"VSCF FAULT-|"LV" light | | | | | *[2] |PROTECT |& GB open | | | | | |TRIP" | *[4] | ................................................................................. |Overfrequency |430 | 5 Hz | Yes | Yes |"VSCF FAULT-| GB open | | | | | *[2] |PROTECT | *[4] | | | | | |TRIP" | | ................................................................................. |Underfrequency|365 | 5 Hz | Yes | Yes |"VSCF FAULT-| GB open | | | | | *[2] |PROTECT | *[4] | | | | | |TRIP" | | ................................................................................. |Overcurrent |180.5 |13.5 Amps | Yes | Yes |"OVERCURRENT|"FF" light | | *[5] | | | *[7] |TRIP" |& GB open | | | | | | | *[4] | ................................................................................. |Differential |25 |5 Amps | Yes | Yes |"DP FAULT |"FF" light | |Protection | | | *[7] | TRIP" |& GB open | | | | | | | *[4] |
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A
737-300/400/500MAINTENANCE MANUAL
~............................................................................... | VSCF Protective Functions | | Table 2 *[1] | ................................................................................. |Open Phase |<5 |1 Amps on | Yes | Yes |"OPEN PHASE | None | | | the low o | | 7 |TRIP" | | | |= or >5 |1 Amps | | | | | | |on the highest o | | | | | ................................................................................. |Overheat |177 degrees | Yes | Yes |"OVERHEAT |None | | |Centigrade | |*[7]*[8] | TRIP" | | ................................................................................. |DC Content |195 millivolts | Yes | Yes |"DC CONTENT |None | |(external) |of direct current| | *[7] | TRIP" | | | |in output | | | | | 2..............….................…...........….........…............…...........1 *[1] VSCF with a three 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 115-125 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
bus to another source. *[7] After 2 to 3 seconds, the generator field will connect again and the voltage will go to 15-20 volts. *[8] Over heat trips after reset will operate for a minimum of 60 seconds before the VSCF will trip again for an overheat condition.
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