P076 Reduction Of Converter Rated Dc Current; P077 Total Thermal Reduction Factor; P078 Reduction Of Converter Rated Supply Voltage; P079 Short Pulses / Long Pulses, Armature Gating Unit - Siemens 6RA70 Series Instructions Manual

PNU Description
P076 Reduction of converter rated DC current
*
i001: Reduction of converter rated DC current (armature)
i002: Reduction of converter rated DC current (field)
(G101)
For the purpose of achieving a close match between the converter and
motor, the converter rated DC current is reduced to the value entered here.
The current value of the device rated DC is indicated in parameter r072.002.
The following values can be set:
10.0%, 20.0%, 33.3%, 40.0%, 50.0%, 60.0%, 66.6% 70.0%, 80.0%, 90.0%
and 100.0%
Note:
If a load class is selected in parameter P067 which causes a reduction in
the converter rated DC current, then the lower of the two parameter setting
values is effective.
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
(G163) on the armature gating unit.
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).
10-16
* k
temp altitude
SIMOREG DC Master Base Drive Panel Operating Instructions
Value range No. indices
[Unit] Factory
Steps setting
Type
see column on left Ind: 2
FS=100.0
Type: O2
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 1 Ind: None
1 FS=0
Type: O2
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P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
Offline
P052 = 3
P051 = 40
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