P340/P342 Motor protection 1/2
P340/P342 Motor protection 1/2
Setting range: OFF / ON ASYNCHRONOUS
OFF: Function not active
ON ASYNCHRONOUS:
When this function is activated, MOVITRAC® B takes over the thermal protection of the connected motor by electronic means. In most cases, the motor protection function is comparable to standard thermal protection (motor protection switch) and, furthermore, it takes account of speed-dependent cooling by the integrated fan. Motor utilization is determined using the inverter output current, cooling type, motor speed and time. The thermal motor model is based on the motor data entered during startup (MOVITOOLS® MotionStudio/DBG60B) and when the operating conditions specified for the motor are observed.
- INFORMATION
- If the motor also has to be protected against failure of the ventilation, blockage of air ducts, etc., it is also necessary to employ protection in the form of a TF positive temperature coefficient thermistor or TH bimetallic switch.
The following signal and display functions are available in conjunction with motor protection:
Parameters | Signal and display function |
|---|---|
P006/P007 Motor utilization 1/2 | Display of the motor utilization for parameter set 1/2. |
Error response of the inverter when reaching P006/P007 motor utilization 1/2 of 110%. Emergency stop/fault |
Set the following parameters:
Parameters | Setting/meaning |
|---|---|
P341/P343 Type of cooling 1/2 | Self-ventilation or forced cooling |
Binary output can be programmed to:
| Prewarning if P006/P007 Motor utilization 1/2 exceeds a value of 100%. In this case, the programmed output is set to "0" = 0 V. |
Important: Switching off the inverter (mains and 24 V external) always resets the motor utilization to "0"; i.e. any motor heating existing when the motor is switched back on is not taken into account.
The motor protection function processes the utilization of the connected motors separately for both parameter sets. The motor protection function must not be used if only one motor is permanently connected to the inverter and the "parameter set changeover" function is only used for control purposes. Equally, the motor protection function must not be used with group drives because it is not possible to protect each individual motor reliably.
