5 commissioning the mains failure control, 5 commissioning the mains failure control 7, 19 function library – Lenze 8400 TopLine User Manual
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Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
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19
Function library
19.1
Function blocks
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19.1.106.5 Commissioning the mains failure control
Commissioning should be executed with motors without load.
1. Start the drive.
2. Set the acceleration time:
• Set the speed setpoint to 100 %, operate the controller with max. speed.
• Set controller inhibit and measure deceleration time up to standstill.
• Set approx. 1/10 of the measured deceleration time in
.
3. Set retrigger time:
• In case of mains failure control via detection of the DC-bus voltage level:
Set the deceleration time measured under point 2 in
• In case of mains failure control via an external system:
Set the time in which the drive is to be continued to be brought to a standstill under control
at short-term mains recovery in
4. Switch off the supply voltage (mains or DC bus).
The following profile is to be shown on the oscilloscope:
[19-47] Schematic diagram with activated mains failure control (ideal profile)
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.
n = speed of the drive
Operating threshold OU
Switch-on threshold - braking unit
Operating threshold - mains failure
Operating threshold LU
n
t
0
t
UG
0
0
1
nDcSet_a
2
L_Compare_3.bOut
3
t1
t2
Point in time Info
t = t1
Mains failure
t = t2
Speed "0" reached.