Siemens SINAMICS S110 - F07086 Units changeover: Parameter limit violation due to reference value change; F07087 Drive: Encoderless operation not possible for the selected pulse frequency; F07088 Units changeover: Parameter limit violation due to units changeover

List of faults and alarms
Faults and alarms
3-1063
© Siemens AG 2012 All Rights Reserved
SINAMICS S110 List Manual (LH7), 06/2012, 6SL3097-4AP10-0BP3
See also: p0640 (Current limit), p1082 (Maximum speed), p1300 (Open-loop/closed-loop control operating mode),
p1800 (Pulse frequency setpoint)
Remedy: Not necessary.
It is not necessary to change the parameters as they have already been correctly limited.
F07086 Units changeover: Parameter limit violation due to reference value change
Message value: Parameter: %1
Drive object: SERVO_S110-CAN, SERVO_S110-DP, SERVO_S110-PN
Reaction: NONE
Acknowledge: IMMEDIATELY
Cause: A reference parameter was changed in the system. This resulted in the fact that for the parameters involved, the
selected value was not able to be written in the per unit representation (cause: e.g. the steady-state minimum/max-
imum limit or that defined in the application was violated). The values of the parameters were set to the correspond-
ing violated minimum/maximum limit or to the factory setting.
Fault value (r0949, parameter):
Diagnostics parameter r9450 to display the parameters that were not able to be re-calculated.
See also: p0304, p0305, p0310, p0596, p2000, p2001, p2002, p2003, r2004
Remedy: Check the adapted parameter value and if required correct.
See also: r9450 (Reference value change parameter with unsuccessful calculation)
F07087 Drive: Encoderless operation not possible for the selected pulse frequency
Message value: Parameter: %1
Drive object: SERVO_S110-CAN, SERVO_S110-DP, SERVO_S110-PN
Reaction: NONE
Acknowledge: IMMEDIATELY
Cause: Encoderless operation is not possible for the selected pulse frequency (p1800).
Encoderless operation is activated under the following conditions:
- the changeover speed for encoderless operation (p1404) is less than the maximum speed (p0322).
- a control type with encoderless operation has been selected (p1300).
- encoder faults of the motor encoder result in a fault response with encoderless operation (p0491).
See also: p0491 (Motor encoder fault response ENCODER), p1300 (Open-loop/closed-loop control operating
mode), p1404 (Encoderless operation changeover speed), p1800 (Pulse frequency setpoint)
Remedy: Increase the pulse frequency (p1800).
Note:
In encoderless operation, the pulse frequency must be at least as high as half the current controller clock cycle
(1/p0115[0]).
F07088 Units changeover: Parameter limit violation due to units changeover
Message value: Parameter: %1
Drive object: SERVO_S110-CAN, SERVO_S110-DP, SERVO_S110-PN
Reaction: NONE
Acknowledge: IMMEDIATELY
Cause: A changeover of units was initiated.
Possible causes for the violation of a parameter limit are:
- when rounding off a parameter corresponding to its decimal places, the steady-state minimum or maximum limit
was violated.
- inaccuracies for the data type "FloatingPoint".
In these cases, when the minimum limit is violated then the parameter value is rounded up and when the maximum
limited is violated the parameter value is rounded down.
Fault value (r0949, decimal interpretation):
Diagnostics parameter r9451 to display all parameters whose value had to be adapted.
See also: p0100 (IEC/NEMA mot stds), p0349 (System of units, motor equivalent circuit diagram data), p0505
(Selecting the system of units), p0595 (Selecting technological units)
Remedy: Check the adapted parameter values and if required correct.
See also: r9451 (Units changeover adapted parameters)