Start-Up
09.02
4-46
Siemens AG 6SE7087-6AK85-1AA0
Rectifier/Regenerating Unit Operating Instructions
given to enable the DC link to re-charge. The converter is not automatically restarted by the WEA
function.
P366 = 2
Restart after system recovery and pre-charging of the DC link after system recovery
While the system is down, the automatic controllers and firing pulses of the rectifier and regenerating
bridges are inhibited. The rectifier/regenerating unit enters the status o010. On power recovery, the
unit is automatically switched on again by the WEA. The DC link is re-charged.
The unit is only switched back on again if there is still an ON command (control word bit 0) active
following system recovery. The WEA function is therefore not possible with an ON command (control
word bit 0) programmed from the PMU or operator panel OP1S provided the external 24 V supply
does not fail.
IMPORTANT: External measures must be taken to guarantee safety on an automatic restart!
Warning
A065
(Automatic restart active):
This warning bit is set following a system failure if the automatic restart function is active, and reset following a
restart by the WEA and completion of the pre-charging process.
The unit can also be switched off by a manual OFF command during this restart phase. Please also refer to
Chapter 7 "Faults and Warnings"
WARNING
In the event of system failures when the WEA function has been activated (P366 = 2), the
unit may restart on system recovery and re-charge the DC link.
If the WEA function (P366 = 2 or P366 = 3) of the converter has been activated, the
converter may also be switched back on. The drive may then stop for some considerable
time and may be erroneously assumed to be switched off.
Fatal injuries, severe bodily harm or damage to property and machinery may result if the
area surrounding the drive is entered while the drive is in this state.
NOTE
If the kinetic buffering function (KIP) is activated on a connected converter from the series SIMOVERT Master
Drives 6SE70, on the rectifier/regenerating unit, P366=2 must be parameterized.
If two rectifier/regenerating units for 12-pulse mode are coupled via peer-to-peer protocol via the basic unit
interface SST2, the peer-to-peer telegram failure time monitoring must be switched off via P687.i003=0 on the
"12-pulse master" unit, otherwise the automatic switch-on with the parameterization P366=2 (on both units)
will not work correctly if the electronics supply voltage fails.
Note about "self-synchronous operation":
When the power section supply voltage fails, the rectifier/regenerative feedback unit initially switches to so-
called "self-synchronous operation" for a period of up to about 160 ms. Firing pulses are still output in the
rectifying direction during this period, but regeneration to the system is inhibited.
This ensures continuous rectifier operation on the two uninterrupted mains supply cables in the case of single-
pole supply voltage failures lasting up to 160 ms minus P793 (130 ms when P793 = 0.03 s).
The rectifier/regenerative feedback unit does not exit the Run operating state until the "self-synchronous
operation" period ends. It then switches to operating state o010 and behaves according to the setting in P366
after the DC link voltage has dropped below the threshold P074 * 1.35 * P071.
https://www.aotewell.com
AoteWell Automation Sales Team
AoteWell LTD
Buy Siemens PLC HMI Drives at AoteWell.com
https://www.aotewell.com
