Siemens SIMOTICS S-1FT7 User Manual

Technical data and characteristic curves
6.1 Explanations
S-1FT7 synchronous motors
Configuration Manual, 09/2018, A5E45099423B AA
137
Shifting the voltage limiting characteristic by a factor x
If the converter output voltage (U
Mot
) is not equal to 380 V, 425 V, 460 V or 510 V, then you
must shift the voltage limiting characteristic involved for the new output voltage (U
Mot, new
).
x
= U
Mot new
/ U
mot
U
Mot, new
= new converter output voltage / V
U
Mot
= converter output voltage from the characteristic for 380 V, 425
V,
460
V or 510 V, see Chapter "Data sheets and characteristics
(Page 150)"
● Shift the voltage limiting characteristic for an output voltage of U
Mot, new
on the x axis
(speed) by factor x.
Calculating the new torque limit with the new limiting characteristic
Procedure
The variables are graphically shown in the following diagram.
1
Voltage limiting line U
Mot
2
New voltage limiting line U
Mot new
Figure 6-4 Shifting the voltage limiting line
Take the values for the variables from the "Technical specifications" tables for the individual
motors, or determine these as described below.
1. Determine P1, the point of intersection of the voltage limiting characteristic on the x axis.
P1 corresponds to n
1
.
n
1
- calculate this as follows:
n
1
= U
Mot
• 1000 / k
E
• 0.95
n
1
/ rpm;
Voltage constant k
E
/ V/1000 rpm
Converter output voltage U
Mot
/ V

Siemens SIMOTICS S-1FT7 Specifications

General

Brand	Siemens
Model	SIMOTICS S-1FT7
Category	Engine
Language	English