Lenze 9400 Manual do Utilizador descarregar pdf (Página 226)

5 Motor interface

5.9 Monitoring

226

Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06

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5.9.4 Motor phase failure monitoring

5.9.4.1 Monitoring of the individual motor phases during operation

Failure of one motor phase during operation

If a current-carrying motor phase (U, V, W) fails during operation, the response set in C00597

is

executed (Lenze setting: "No response") if two conditions are fulfilled:

• Condition 1: Monitoring is activated

To safely detect a motor phase failure, a certain motor current must flow for the current sensor

system.

• Monitoring will therefore only be activated if, in the case of servo control the setpoint of the

motor current, and in the case of sensorless vector control or V/f control the actual value

motor current (display in C00054

) has exceeded a certain current value.

• The current value for the activation can be set in C00599

in [%] with regard to the maximum

device current (display in C00789

).

• Condition 2: A specific commutation angle was covered without the detection of a current flow.

In this case monitoring works according to the principle of checking for each motor phase that a

current flows depending on the commutation angle.

• Monitoring responds if a rotating field is output and hence a specific commutation angle

(approx. 150°, electric) is covered without the current having exceeded a (non-parameterisable)

threshold that depends on the device power.

 Note!

• In case of sensorless vector control or V/f control, the safe detection of a motor phase

failure is only carried out if the actual current has exceeded the 3.5-fold value of the

threshold parameterised in C00599

.

• The dependence on the commutation angle also causes a dependence on the motor

type used:

• The commutation angle and the angle at the shaft (number of pole pairs) of a

synchronous machine are proportional. This makes it possible to predict which

shaft angle is maximally covered in case of error.

• An asynchronous machine has an additional slip between the commutation angle

and the angle on the shaft. This results in a load dependency due to which it is

impossible to predict the maximally covered shaft angle in the event of a fault.

In certain applications (e.g. hoists during lowering operation at non-zero speeds) it

may be possible that a rotating field is no longer applied. Instead, a DC current

flows. In this case, condition 2 is no longer met.

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