Siemens SINUMERIK 802D sl Instrukcja Operatora Pobierz pdf (Strona 178)

Overview of alarms 06/2009

NCK alarms

2-178

SINUMERIK 802D sl, Diagnostics Manual, 06/2009

2. Encoder pulses: Is the encoder power supply within the tolerance limits?

3. Evaluation electronics: Replace or reconfigure the drive or encoder module used.

Monitoring can be switched off by setting MD36310 $MA_ENC_ZERO_MONITORING [n] to 0 or 100

(n = encoder number: 1, 2).

Program Con-

tinuation:

Clear alarm with the RESET key in all channels of this mode group. Restart part program.

25021 Axis %1 zero mark monitoring of passive encoder

Parameters: %1 = Axis name, spindle number

Definitions: Monitoring relates to the encoder that is not used by the position control. (NC-PLC interface signal

V380x 0001.5 = 0 (Position measuring system 1) or V380x 0001.6 = 0 (Position measuring system 2))

More detailed explanations are similar to those for alarm 25020.

Reaction: Alarm display.

Remedy: Please inform the authorized personnel/service department. The differences can result from transmis-

sion errors, disturbances, encoder hardware faults or from the evaluation electronics in the encoder

not used for position control. The actual value branch must therefore be checked:

1. Transmission path: Check the actual-value connectors for correct contacting, encoder cable for

continuity, and also check for short-circuits and grounding (loose contact?).

2. Encoder pulses: Is the encoder power supply within the tolerance limits?

3. Evaluation electronics: Replace or reconfigure the drive or encoder module used.

Monitoring can be switched off by setting MD36310 $MA_ENC_ZERO_MONITORING[n] to 0 or 100

(n = encoder number: 1, 2).

Program Con-

tinuation:

Clear alarm with the Delete key or NC START.

25030 Axis %1 actual velocity alarm limit

Parameters: %1 = Axis name, spindle number

Definitions: If the axis has at least one active encoder, then the actual speed of the axis is cyclically checked in

the IPO cycle. If there are no errors, the actual velocity can never become greater than specified in

the axis-specific MD36200 $MA_AX_VELO_LIMIT (threshold for velocity monitoring). This threshold

value in [mm/min, rev/min] is input by an amount that is about 5 to 10% greater than that which can

occur at maximum traversing velocity. Drive errors can result in the velocity being exceeded and the

alarm is then triggered.

The alarm can be reprogrammed in the MD11412 $MN_ALARM_REACTION_CHAN_NOREADY

(channel not ready).

Reaction: Mode group not ready.

The NC switches to follow-up mode.

Channel not ready.

NC Start disable in this channel.

Interface signals are set.

Alarm display.

NC Stop on alarm.

Channel not ready.

Remedy: Please inform the authorized personnel/service department.

- Check the speed setpoint cable (bus cable).

- Check the actual values and direction of position control.

- Change the position control direction if the axis rotates uncontrollably -> axis-specific MD32110

$MA_ENC_FEEDBACK_POL [n] = < -1, 0, 1 >.

- Increase the monitoring limit value in MD 36200 $MA_AX_VELO_LIMIT.

Program Con-

tinuation:

Clear alarm with the RESET key in all channels of this mode group. Restart part program.

25040 Axis %1 standstill monitoring

Parameters: %1 = Axis name, spindle number

Definitions: The NC monitors to ensure that the position is held at zero speed. Monitoring is started after a time

that can be set for a specific axis in the MD36040 $MA_STANDSTILL_DELAY_TIME after interpola-

tion has ended. A constant check is made to determine whether the axis remains within the tolerance

range given in MD36030 $MA_STANDSTILL_POS_TOL.

The following cases are possible:

1. The NC/PLC interface signal V380x 0002.1 (Servo enable) is zero because the axis has jammed

mechanically. Due to mechanical influences (e.g. high machining pressure), the axis is pushed out-

side the permissible position tolerance.

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