09.02
Connection
Siemens AG 6SE7087-6AK85-1AA0
3-49
Rectifier/Regenerating Unit Operating instructions
The cable length within the unit from the connector on the A23 module (X27 or X28) to the top edge of the unit
on the rear panel (cabinet wall) is 1m to the left and 1.8 m to the right. This includes the spare length required
for removing the A23 module with its carrier board for service purposes.
WARNING
When the A23 module of a parallel unit is removed for servicing, the terminals of
the current transformers are open. The parallel unit must not be operated,
otherwise the current transformers of the parallel unit can be damaged by
currents from the snubber RC network.
Non-compliance may result in the destruction of the current transformer of a
parallel unit.
Parameterization:
Parameter P076 (configuration of the power section)
P076 = 01x 1 common rectifier parallel unit is connected in parallel with the basic unit
P076 = 02x 2 common rectifier parallel units are connected in parallel with the basic unit
P076 = 11x 1 rectifier/regenerating parallel unit is connected in parallel with the basic unit
P076 = 12x 1 common rectifier parallel unit and 1 rectifier/regenerating parallel unit are connected in
parallel with the basic unit
P076 = 22x 2 rectifier/regenerating parallel units are connected in parallel with the basic unit
NOTE
With the parameterization P076=00x, a connected parallel unit still receives firing pulses and carries current, it
is only the monitoring for current asymmetry (over-current or under-current in the parallel power section as
compared to the current in the basic unit, -F034) that is not active.
The results of the thyristor test (selected via P353) are only conditionally applicable when units are connected
in parallel.
Start-up:
The start-up procedure is exactly the same as in the case of a single basic unit. The final cabling (parallel
connection of the power sections and coupling via the 50-core ribbon cable) must however already exist
because the parallel units also carry current during circuit identification.
Note:
In the case of 1 or 2 parallel units connected in parallel, the value of parameter P144 (DC link
capacitance) only represents a half or 1/3 of the actual DC link capacitance because parameter
P075 for the basic unit contains the rated current for a single power section.
LED display on the A23 power interface module (C98043-A1695) of a parallel unit:
Green LED (H11) lit:
The power supply on this parallel unit is operating.
Yellow LED (H12) lit:
On this parallel unit, the highest temperature of any power section connected in
parallel has been measured (this does not necessarily mean over-temperature). If the
yellow H12 LED is not lit on any of the parallel units, the highest temperature is
currently measured at the power section of the basic unit.
Red LED (H13) lit:
A fuse has fused on this parallel unit.
CAUTION
On parallel connection the rating of the relay contact K1-2 (connection X9-4, X9-5) should be taken into
account (refer to Chapter 3.2).
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