Siemens Sinumerik 840D sl Diagnostic Manual page 891

03/2009
Cause: The amplitude of the reference track signal (track R) does not lie within the tolerance bandwidth for
encoder 2.
The fault can be initiated when the unipolar voltage range is exceeded or the differential amplitude is
initiated.
Fault value (r0949, interpret hexadecimal):
xxxx hex:
xxxx = Signal level, track R (16 bits with sign).
The unipolar nominal signal level of the encoder must lie in the range 2500 mV +/- 500 mV.
The response threshold is < 1700 mV and > 3300 mV.
The nominal differential signal level of the encoder must lie in the range 375 mV to 600 mV (500 mV
-25/+20 %).
The response threshold is > 750 mV.
A signal level of 500 mV peak value corresponds to the numerical value of 5333 hex = 21299 dec.
Note:
The analog value of the amplitude error is not measured at the same time with the hardware fault out-
put by the sensor module.
The signal level is not evaluated unless the following conditions are satisfied:
- Sensor Module properties available (r0459.30 = 1, r0459.31 = 1).
- monitoring active (p0437.30 = 1, p0437.31 = 1).
Remedy: - check the speed range, frequency characteristic (amplitude characteristic) of the measuring equip-
ment may not be sufficient for the speed range.
- check that the encoder cables and shielding are routed in compliance with EMC.
- check the plug connections and contacts.
- check whether the zero mark is connected and the signal cables RP and RN connected correctly.
- replace the encoder cable.
- if the coding disk is soiled or the lighting worn, replace the encoder.
232110 <location>Encoder 2: Serial communications error
Message Fault cause: %1 bin
value:
Drive object: All objects
Reaction: A_INFEED: NONE
SERVO: OFF1 (IASC/DCBRAKE, NONE, OFF2, OFF3)
VECTOR: OFF1 (IASC/DCBRAKE, NONE, OFF2, OFF3)
Acknowledge: PULSE INHIBIT
Cause: Serial communication protocol transfer error between the encoder and evaluation module.
Fault value (r0949, interpret binary):
Bit 0: Alarm bit in the position protocol.
Bit 1: Incorrect quiescent level on the data line.
Bit 2: Encoder does not respond (does not supply a start bit within 50 ms).
Bit 3: CRC error: The checksum in the protocol from the encoder does not match the data.
Bit 4: Encoder acknowledgement error: The encoder incorrectly understood the task (request) or can-
not execute it.
Bit 5: Internal error in the serial driver: An illegal mode command was requested.
Bit 6: Timeout when cyclically reading.
Bit 8: Protocol is too long (e.g. > 64 bits).
Bit 9: Receive buffer overflow.
Bit 10: Frame error when reading twice.
Bit 11: Parity error.
Bit 12: Data line signal level error during the monoflop time.
Bit 13: Data line incorrect.
Remedy: Re fault value, bit 0 = 1:
- encoder defective. F31111 may provide additional details.
Re fault value, bit 1 = 1:
- Incorrect encoder type / replace the encoder or encoder cable.
Re fault value, bit 2 = 1:
- Incorrect encoder type / replace the encoder or encoder cable.
Re fault value, bit 3 = 1:
- EMC / connect the cable shield, replace the encoder or encoder cable.
Re fault value, bit 4 = 1:
- EMC / connect the cable shield, replace the encoder or encoder cable, replace the Sensor Module.
© Siemens AG 2009 All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
SINAMICS-Alarms
2-891