Function block library
7-153

SHB9300CRV EN 2.0
Function
The controller gains the required energy from the rotational energy of the driven machine.The driven
machine is braked via the power loss of the controller and the motor.The speed deceleration ramp
is shorter than for an uncontrolled system (coasting drive).
With the activation,
l
the DC bus voltage is controlled to the value at the MFAIL-DC-SET input.
l
an internally generated speed setpoint is output at the MFAIL-N-OUT output. The drive can
thus be braked to zero speed (via the speed setpoint).
– The value at input MFAIL-SET is the start value for the controlled deceleration.This input is
generally connected to the output MCTRL-NACT (actual speed) or MCTRL-NSET2,
MFAIL-NOUT (speed setpoint).
– The speed deceleration ramp (and thus the brake torque)results from the moment of inertia
of the driven machine(s), the power loss, and the parameterization.
Stop!
l
If a connected brake unit is activated, the drive is braked with the maximum possible torque
(Imax).In this case, it may be necessary to adapt the parameterization (see description of the
parameterization).
l
If the power stage is not supplied, the drive cannot generate a standstill torque (important for
active loads such as hoists).
Parameter setting
The parameters to be set, depend strongly on the motor used, the inertia of the driven machine and
thedrive configuration (singledrive, drivenetwork, master- slaveoperation, etc.). This function must
therefore be adapted to the individual application in every case.
The following specifications refer to Chapter 7.6.48.1
Important settings prior to the initial set-up:
1. Save the previous setting in a parameter set (e.g. parameter set 4)
Stop!
For internalvoltagesupplyof theterminals(C0005 = xx1x)terminalX6/63 is used asa voltagesource
for external potentiometers.In this case, measure across terminals +UG, -UG.
2. Measure the DC bus voltage with an oscilloscope (channel 1)
– with a suitable voltage divider across terminals +UG, -UG. or
– by providing the DC bus voltage e.g. at terminal X6/62. For this ,set C0436 = 5005
(MCTRL-DCVOLT). 1 V at terminal X6/63 = 100 V at +UG, -UG.
3. Measure the speed with an oscilloscope (channel 2)
– by supplying the speed on terminal X6/62 for instance (standard setting). For this, set C0431
= 5001 (MCTRL-NACT). 10 V at terminal X6/62 = nmax (C0011).
4. Provide the threshold for the mains failure detection in C0472/20.The provision depends on
the setting in C0173.
– Set the threshold approx. 50 V above the threshold LU (example for C0173 = 0,1; C0472/20
=48%
480 V).
Mains voltage range C0173 = Switch-off thres-
hold LU
Switch-on thres-
hold LU
Switch-off thres-
hold OU
Switch-on thres-
hold OU
< 400 V 0 285 V 430 V 770 V 755 V
400 V 1 285 V 430 V 770 V 755 V
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