Siemens Sinumerik 840D sl Diagnostic Manual page 894

Overview of Alarms
SINAMICS-Alarms
Cause: The amplitude of the rectified encoder signals A and B and the amplitude from the roots of A^2 + B^2
for encoder 2 are not within the tolerance bandwidth.
Fault value (r0949, interpret hexadecimal):
yyyyxxxx hex:
yyyy = Signal level, track B (16 bits with sign).
xxxx = Signal level, track A (16 bits with sign).
The nominal signal level of the encoder must lie in the range 375 mV to 600 mV (500 mV -25/+20 %).
The response thresholds are < 176 mV (observe the frequency response of the encoder) and > 955
mV.
A signal level of 500 mV peak value corresponds to the numerical value 5333 hex = 21299 dec.
Note:
The analog values of the amplitude error are not measured at the same time with the hardware fault
output by the sensor module.
Remedy: - check that the encoder cables and shielding are routed in compliance with EMC.
- check the plug connections.
- replace the encoder or encoder cable.
- check the Sensor Module (e.g. contacts).
232117 <location>Encoder 2: Inversion error signals A and B and R
Message -
value:
Drive object: All objects
Reaction: A_INFEED: NONE
SERVO: OFF1 (IASC/DCBRAKE, NONE, OFF2, OFF3)
VECTOR: OFF1 (IASC/DCBRAKE, NONE, OFF2, OFF3)
Acknowledge: IMMEDIATELY
Cause: For a square-wave signal encoder (TTL. bipolar. double ended) the A* and B* and R* signals are not
inverted with respect to signals A and B and R.
Note:
For CU310, CUA32, D410, SMC30 (only Order No. 6SL3055-0AA00-5CA0 and 6SL3055-0AA00-
5CA1), the following applies:
A squarewave encoder without track R is used and the track monitoring (p0405.2 = 1) is activated.
Remedy: - check the setting of p0405: p0405.2 = 1 is only possible if the encoder is connected at X520.
- check the encoder/cable: Does the encoder supply TTL signals and the associated inverted signals?
Note:
For a squarewave encoder without track R, the following jumpers must be set at the encoder connec-
tion:
- pin 10 (reference signal R) <--> pin 7 (encoder power supply, ground)
- pin 11 (reference signal R inverted) <--> pin 4 (encoder power supply)
232118 <location>Encoder 2: Speed difference outside the tolerance range
Message %1
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: For an HTL/TTL encoder, the speed difference has exceeded the value in p0492 over several sam-
pling cycles.
The change to the averaged speed actual value - if applicable - is monitored in the current controller
sampling time.
Fault value (r0949, interpret decimal):
Only for internal Siemens troubleshooting.
See also: p0492
Remedy: - check the tachometer feeder cable for interruptions.
- check the grounding of the tachometer shielding.
- if required, increase the maximum speed difference per sampling cycle (p0492).
2-894
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG 2009 All Rights Reserved
03/2009