Lenze 4800 Manual page 136

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Set-value conditioning of the slave
The value read from Dig_In_2 (X9) forms the set-value (speed and phase) for the
internal control and is also the output value at the digital frequency output. The
set-value is evaluated with the encoder constant (C026, C027 and C028 when
C025 = -11-) and the gearbox factors C032 and C033.
The direction of the slave can be changed with the CW/CCW changeover. If the
direction of rotation is changed while the machine is running, pulse losses, which
lead to phase errors, occur. The direction changeover can, for instance, be used
for electrical shafts, consisting of 2 opposite motors.
Special features compared to speed control
( No set-value integrator in the set-value branch.
( The changeover to a JOG value is not possible.
( The additional set-value is not active.
Feedback system
The feedback system is selected by means of the configuration
(
(
QSP at the slave
If QSP is switched at the slave, the set-value (C050) is reduced along the QSP
ramp. Homing points are lost. A drift-free standstill is obtained because with the
switching of QSP the set phase is led by the QSP integrator.
If the deceleration ramp is very short and it can only be achieved with I
set-value integrator follows the actual phase integrator. Thus, the rotor does not
turn back when reaching n = 0.If the I
be reactivated and drift-free standstill can be ensured.
Ctrl. enable at the slave
If a slave is inhibited, the motor coasts at the friction torque. At the DF output, the
set-value for the following slave is still output.
If the slave is enabled, the drive accelerates to its set-value (possibly at the current
limit). With switching controller enable, the phase difference is set to zero. Homing
points are lost.
Exception
If the controller is inhibited because of a short-term synchronisation fault or mains
interruption, the phase difference will not be reset. After mains recovery, the drive
is able to follow its set phase. A phase difference, detected before, will be
compensated.
C005 = -62- resolver or
C005 = -63- incremental encoder
Configuration
message is reset, the phase control will
max
the
max
48XX/49XXSHB0399
7-45