Siemens SIMOTRAS 6SG7050, Operating Instructions Manual

Page: 362 / 604

Parameter list 01.04
11-14
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
PNU Description Value range
[Unit] No. indices See
Change
P075
*
(G101)
(G161)
Control word for power section
Selection of operating characteristics of thermal monitor (I2t monitoring) of
power section
0 Dynamic overload capability is not permitted
The motor current is limited to P077 * r072.001.
1 Dynamic overload capability is permitted, alarm A039
The motor current is limited to P077 * 2 * r072.001 as long as
the calculated thyristor temperature does not exceed the
permitted value.
If the temperature exceeds the permitted value, the SIMOTRAS
HD protects itself by reducing the current limit to P077 *
r072.001. Alarm A039 is output at the same time.
The motor current setpoint limit is not increased to P077 * 2 *
r072.001 (alarm A039 also disappears) until the calculated
thyristor temperature has dropped below the limit value again
and the motor current setpoint is lower than the converter rated
current (r072.001).
2 Dynamic overload capability is permitted, fault F039
The motor current is limited to P077 * 2 * r072.001 as long as
the calculated thyristor temperature does not exceed the
permitted value.
Fault message F039 is output if the permissible temperature
limit is exceeded.
0 to 2
1 Ind: None
FS=1
Type: O2 P052 = 3
P051 = 40
Offline
P076
*
(G101)
Reduction of converter rated current
i001: For the purpose of achieving a close match between the
converter and motor, the converter rated current is reduced to
the value entered here.
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%
*) for use by works engineers only
i002: irrelevant
see Column 2 Ind: 2
FS=100.0
Type: O2 P052 = 3
P051 = 40
Offline
P077
(G101)
(G161)
Total thermal reduction factor
The factor set in this parameter effects a reduction in the motor current limit
(as defined by the setting in P075).
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 40°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
temp
= (100 - a) / 100
– 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
altitude
= b1 / 100
P077 must be set as follows:
P077 = k
temp
* k
altitude
Note:
A general reduction in the converter rated current (through appropriate
setting of parameter P076.001) can be included in this calculation.
0.50 to 1.00
0.01 Ind: None
FS=1.00
Type: O2 P052 = 3
P051 = 40
Offline