Siemens SIMODRIVE 611A, Инструкция по установке и планированию

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AL S
08.95
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Siemens AG 1997 All Rights reserved 6SN1197–0AA20
SIMODRIVE 611 (PJ)
In order to be able to identify the motor limits at DC link voltages other than 600
V, the indicated voltage limiting characteristic for the particular armature circuit,
must be shifted. A lower DC link voltage is obtained, for example, when operat-
ing the motor from uncontrolled supply infeeds. A higher DC link voltage can
occur, e.g. if the drive converter is connected to a 480 V supply.
The degree of the shift is obtained as follows:
Along the x axis (speed), for a DC link voltage of V
DC link (new)
, a shift by the
factor: V
DC link (new)
/600 V for 1FT5/6
V
DC link (new)
/540 V for 1FK6
Example:
If a point (P1) of the particular voltage limiting characteristic is at 3000 RPM, the
new voltage limiting characteristic for 490 V runs through (P2):
490 V
600 V
= 0.82
3000 RPM
<
0.82 = 2460 RPM.
The new voltage limiting characteristic must, for n = 2460 RPM, be drawn in
parallel to the existing characteristic.
P1 P2
M [Nm]
M
limit
(P3)
0.82
n [RPM]
n
rated
2460 3000
S1 (100 K)
490 V limiting characteristic
600 V limiting characteristic
M
limit
(P4)
Thermal limiting characteristic
Shift
DC link < 600V DC link > 600 V (
v
700 V)
Fig. 1-4 Shifting the voltage limiting characteristics
The new limiting torque with the new limiting characteristic can be calculated
according to the following formula:
1FT5:
V
DC link (new)
– k
E *
n
rated
/1000
600 V – k
E *
n
rated
/1000
* M
limit
U
DC link (new)
– 2
*
k
E *
n
rated
/1000
600 V – 2
*
k
E *
n
rated
/1000
* M
limit
M
limit (new)
=
U
DC link (new)
– 2
*
k
E *
n
rated
/1000
540 V – 2
*
k
E *
n
rated
/1000
* M
limit
1FT6:
M
limit (new)
=
1FK6:
M
limit (new)
=
k
E
= Voltage constant from the data sheet
M
limit
= Limiting torque from the data sheet (P3)
M
limit (new)
= New limiting torque at n
rated
(P4)
n
rated
= Rated speed from the data sheet
Check: P4 must lie on the new limiting characteristic which was entered
Shifting the
voltage limiting
characteristic
General information on AC servomotors
1.1 Definitions 01.98