Lenze DDS Function library 9300 Servo - Manual (Page 24)

Function block library Lenze9300Servo.lib
Special functions
2.1.2 Supply−failure control (L_MFAIL)
2−14
L
Lenze9300Servo.lib EN 1.1
Reset of the supply failure control
·
The supply−failure control is reset with bReset_b = TRUE (in the example, through X5/E5
(when DIGIN_bIn5_b is connected to bReset_b ).
·
The reset pulse is always required if:
– The restart protection is active.
– The restart protection is used and the supply (supply or DC supply) was switched on.
2.1.2.3 Restart protection
The integrated restart protection is to avoid a restart in the lower speed range, after the supply voltage
was interrupted for a short time only (supply recovery before the drive has come to standstill).
·
Establish the restart protection ( ^ 2−9: Parameterization of the example in Abb. 2−10)
·
In C0472/18 ( FCODE_nC472_18_a ), enter the threshold in [%] of n
max
(C0011) below which
no automatic start is wanted after supply recovery.
– If the speed at supply recovery < threshold in C0472/18 ( FCODE_nC472_18_a ): the drive
will still be braked under control. This function can only be ended by bReset_b = TRUE.
– If the speed at supply recovery > threshold in C0472/18 ( FCODE_nC472_18_a ): the drive
accelerates to its setpoint along the set ramps.
– The function is deactivated by: nThreshold_a = 0%.
·
A reset is made by bReset_b = TRUE
– This is required after every supply (re)connection, and is shown by bStatus_b = HIGH, when
bFault_b = FALSE.
Note!
To be able to make the settings through the system block (SB) FCODE, you must also have used the
free codes of the SB FCODE.
2.1.2.4 Dynamic adaptation of the control parameters
In special cases, a dynamic modification of the proportional gain may be useful. Two inputs are
available for this purpose at FB L_MFAIL ( nConst_a and nAdapt_a ). The resulting proportional gain
results from:
V
p
+ nVp @
nConst_a
* |nAdapt_a|
100 %
(100 % º 16384)