Siemens 6RA70 specifications P078.001 ∗ 100%P353, Fault Description

Fault

No.

Description
Cause as a function of fault value	Further information (r047.002 to r047.016)
(r047.001, r949.001 or r949.009 with acknowledged error)

F004 Phase failure in armature supply (active in operating states of ≤ o4)

The supply voltage RMS value, calculated from the area of each supply half-wave (rectified average value * peak factor), must be greater than the response value for phase failure monitoring

P078.001 ∗ 100%P353

The distance between two identical supply zero passages of a phase must not exceed 450 degrees.

If one of these two conditions remains unfulfilled for longer than the “restart time” set in P086, a fault message is activated. After switch-on, the converter waits in operating states o4 and o5 together for a period not exceeding the setting in P089 for voltage to appear at the power terminals (and for field current) before activating the fault message.

Possible fault causes:

♦Parameter P353 is incorrectly set

♦Armature phase has failed

♦Line contactor opened in operation

♦Fuse has blown on three-phase side in armature circuit

♦Fuse has blown in power section

♦Interruption in a thyristor firing pulse cable (auxiliary cathodes at connectors X12, X14, X16 are voltage carriers).

Fault value:

1Voltage failure has occurred in armature supply (1U1, 1V1, 1W1) (when P086=0)

2Delay time set in parameter P089 has expired in operating state o4

3Fuse has blown in power section

4Voltage failure has lasted longer than period set in P086 (if this is >0)

6The "Main contactor checkback" (control word 2 bit 31) [see also P691] did not switch to "1" before the time set in P095 ran out, or switched back to "0" during operation [V1.8 and later].

F005 Fault in the field circuit (active in operating states of ≤ o5)

The line voltage RMS value calculated from the area of each network half-wave (rectification average value * peak factor) must be greater than the response value for phase failure monitoring

P078.002 ∗ 100%P353

The distance between two identical network zero passages of the voltage for the field converter must not exceed 450 degrees.

The actual field current K0265 equals < 50% of the required field current setpoint K0268 for more than 500ms. This monitoring function is effective only if the field current setpoint corresponds to >2% of the converter rated field current.

[In SW 1.9 and later, the percentage (50%) and time (500ms) can be altered in P396 and P397 respectively]

If one of the fault conditions described persists in operation (or ≤ o4) for longer than the “restart” time set in P086, the fault message is output.

After the converter is switched on, it waits in operating state o5 for a period not exceeding the setting in P089 for the field supply voltage or sufficiently high field current before this fault message is activated.

Monitoring for timeout as the field decays or builds up after initiation of field reversal (fault values 6 and 7) is not implemented until SW 1.7 and later.

Possible fault causes

♦Threshold for phase failure (P353) set incorrectly

♦Field phase failed

♦Line contactor opened during operation

♦Fuse blown in the field circuit

♦Field current controller and/or field current precontrol not optimized or badly optimized (check P112, P253 to P256; possibly execute current controller optimization)

♦Check P396 (field current monitoring threshold) and P397 (field current monitoring time)

♦If the fault value is 6: Offset fault in the actual field current value sensing, relevant parameter: P825.i01-i03 (Offset depends on P076.i02) or P394, P395 (Threshold and hysteresis for message I_field < I_field_min) must be checked

♦If the fault value is 7: Circuit for the "new" field direction is interrupted (e.g. because the contactor for "new" field direction does not pick up), P398, P399 (Threshold and hysteresis for message I_field < I_field_x) must be checked

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