Lenze 931W - Manual (Page 22)

Software implementation and parameter setting
Status menu
5

22 HB 13.0001-EN 3.0
Position value
Depending on the conversions and display units set in the ”System” menu and on the
gearbox ratio set in the ”Service” menu, the current absolute position value is displayed
here. The correctness of the value displayed here primarily depends on the reference run,
as here a home mark is determined, to which all absolute position value are relating. The
position encoder used in the motor technically speaking is not an absolute value encoder.
As soon as the voltage is taken away from the motor electronics, and the axis is rotated in
the deenergised state, the motor has to be referenced again, so that the position value is
correct. In order to avoid a new reference run after the system has been switched off, e.g.
by emergency stop, the current position value can be recorded further on by a 24 V
emergency supply of the electronics.
System deviation
The difference between the setpoint and actual value is referred to as a system deviation.
The amount of the system deviation furthermore depends on the conversions and display
units set in the ”System” menu.
System deviation = setpoint - actual value
Eventually,thevariabletobecontrolledis determinedby theselected controllertype ofthe
current travel data set: velocity or speed, force or torque, and at last the position value.
Voltage for brake
If the motor is provided with a brake, and if this brake is connected to the electronics, this
field indicates the voltage that is applied to the brake. For the open brake, a smoothed DC
voltage of 24V ± 10% is required, which can also be provided by external operation, for
instance via PLC. Be absolutely sure to note that this voltage is maintained during
operation, as otherwise an unintentional closing of the brake may result in premature
wear of the brake. For this purpose, a warning is output between 22 V and 26 V, in case of
valuesbelow20Vorabove28V,themotorisswitchedoffandafaultisindicated.If anerror
occurs, the brake can be separately disengaged via the supply, in order to enable a
traversing of the axis in case of emergency stop activation ( GHB 931M/W).