Siemens 6RA7086-6KS22 Operating Instructions Manual page 481

05.05
PNU Description
P077 Total thermal reduction factor
The factor set in this parameter effects a reduction in the armature current
(G101)
limit (as defined by the setting in P075).
(G161)
The converter must be derated in the following instances:
– Operation at high ambient temperatures:
If the ambient temperature is higher than 45°C (on naturally air-cooled
converters) or 35°C (on converters with forced air-cooling), the possible
load capability of the converter decreases as a consequence of the
maximum permissible thyristor junction temperature by percentage
reduction "a" as specified in the table in Section 3.4, resulting in a
temperature reduction factor of
k = k1
temp
– Installation altitudes of over 1000m above sea level:
In this case, the lower air density and thus less effective cooling reduce
the possible load capability of the converter to the percentage load "b1"
specified in the table in Section 3.4, resulting in an installation altitude
reduction factor of
k = k2
altitude
P077 must be set as follows: P077 = k
Note:
A general reduction in the converter rated DC current (through appropriate
setting of parameter P076.001) can be included in this calculation.
P078 Reduction of converter rated supply voltage
i001: Rated input voltage converter armature
(G101)
i002: Rated input voltage converter field
The rated voltage value of the power system actually used to supply the
power section must be set in this parameter.
This setting acts as the reference for the undervoltage, overvoltage and
phase failure monitoring functions (see also P351, P352 and P353) as well
as for connectors K0285 to K0289, K0291, K0292, K0301 K0302, K0303
and K0305
NOTE
If a SIMOREG converter is operated at a rated input voltage that is
lower than its rated supply voltage, then the rated DC voltage specified
in the technical data (Section 3.4) cannot be reached !
P079 Short pulses / long pulses, armature gating unit
*
0 Short pulses (0.89 ms=approx. 16 degrees at 50 Hz) are output
(G162) on the armature gating unit.
(G163)
1 Long pulses (pulse duration up to approx. 0.1 ms before next
pulse) are output on the armature gating unit (e.g. required in
cases where field is supplied via armature terminals).
2 Must be set on the 12-pulse series master and the 12-pulse
series slave in a 12-pulse series connection (if two units are fed
with two line voltages with a 30 degree phase displacement)
[can only be set in SW 2.1 and later]. This setting has the
following effect:
•
Long pulses (pulse duration up to approx. 0.1 ms before next
pulse) are output every 30 degrees on the armature gating
unit.
•
Precontrol for the armature current controller is switched over
from 6-pulse operation to 12-pulse series connection
operation (half the total motor EMF must be fed in P162).
•
P110 and P111 only have an effect on half the set total motor
value (Sheets G162, G165)
3 Must only be set on the paralleling device of the 12-pulse series
master in a 12-pulse series connection (if two units are fed with
line voltages with a 30 degree phase displacement). Long
pulses (pulse duration up to approx. 0.1 ms before next pulse)
are output every 30 degrees on the armature gating unit [can
only be set in SW 2.1 and later].
SIEMENS AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
* k
temp altitude
Value range No. indices
[Unit] Factory
Steps setting
Type
0.50 to 1.00 Ind: None
0.01 FS=1.00
Type: O2
i001: 10 to r071 Ind: 2
i002: 10 to r074 FS=
[V] i001: r071
1V i002: 400V
except when
r071 = 460V
then 460V
Type: O2
0 to 3 Ind: None
1 FS=0
Type: O2
Parameter list
See
Change
(Access /
Status)
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
11-17