
Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
1412
17
Function library
17.1
Function blocks | L_MFail_1
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
17.1.102.4 Parameterising the mains failure control
The parameters to be set before initial commissioning strongly depend on the used motor, the
moment of inertia of the drive and the drive configuration (single drive, drive system, master/slave
operation etc.) and must hence be adapted to the corresponding application case.
1. Measure the DC-bus voltage with an oscilloscope (channel 1).
• Signal for the message:
nDCVoltage_a
of the SB
2. Measure the speed with an oscilloscope (channel 2).
• Signal for the message:
nMotorSpeedAct_a
of the SB
.
3. Set the operating threshold for the mains failure control in
.
• Scaling: 100 %
≡
1000 V
• Recommended setting: approx. 50 V above the reset threshold for undervoltage in the DC
bus (LU
off
).
•
From version V17.00.00
: For a mains voltage of 500 V you can raise the operating threshold
OU
on
and the reset threshold OU
off
by 10 V via bit 14 in
• The operating thresholds for undervoltage (LU) and overvoltage (OU) depend on the setting
:
4. Set the voltage setpoint in
the DC-bus voltage is to be controlled to.
• Scaling: 100 %
≡
1000 V
• Recommended setting: approx. 700 V
= 70 %
17.1.102.5 Commissioning the mains failure control
Commissioning should be executed with motors without load.
Note!
The following data refers to the chapter "
Procedure of the mains failure control
Mains voltage
Undervoltage (LU)
Overvoltage (OU)
1-phase
C00173
Operating threshold
LU
on
Reset threshold
LU
off
Operating threshold
OU
on
Reset threshold
OU
off
230V
AC
0, 1, 2, 3
180 V
DC
240 V
DC
400 V
DC
390 V
DC
Mains voltage
Undervoltage (LU)
Overvoltage (OU)
3-phase
C00173
Operating threshold
LU
on
Reset threshold
LU
off
Operating threshold
OU
on
Reset threshold
OU
off
400V
AC
0
285 V
DC
430 V
DC
800 V
DC
790 V
DC
440V
AC
1
400 V
DC
430 V
DC
480V
AC
2
490 V
DC
535 V
DC
500V
AC
3
540 V
DC
585 V
DC
Stop!
The voltage setpoint must be below the operating threshold of a braking unit if
connected. If a connected braking unit responds, the drive with max. possible torque
(I
max
) will be braked. The desired operational performance gets lost.