Note:
ACS880-07/07LC drives, frames n×DXT + n×R8i with a main contactor/breaker (option
+F250/+F255), ACS880-17/17LC/37/37LC drives, frames n×R8i + n×R8i, and ACS880-17/37
drives, frames R8 and R11: When the inverter unit STO is activated, the main
contactor/breaker is opened after a user-defined delay (defined with parameter
94.11
, the
default value is
600 s
). See the hardware and firmware manuals for more information.
For a detailed description of the drive STO function, see the hardware manual.
The design principles of the Q957 comply with EN ISO 14118. The STO function
complies with IEC/EN 61800-5-2. For a complete list of related standards and European
directives, see section
Related standards and directives (page 35)
Operation principle
The figure shows a simplified operation principle. For a more detailed description, refer to
the circuit diagrams delivered with the drive.
-A65
24 VDC+
1
0
-P
-A41
-T11.x
XSTO
XSTO
.OUT
2)
IN2
OUT
SGND
IN1
IN2
OUT
SGND
IN1
IN1
SGND
IN2
SNGD
IN1
SGND
IN2
SNGD
-X51B
-X52B
IN1
SGND
IN2
SGND
IN1
SGND
IN2
SGND
OUT1
SGND
OUT2
SGND
OUT1
SGND
OUT2
SGND
-X969
-X969
1)
-S
M
3~
M
3~
~~
3)
Main circuit
~
M
3~
~
3)
Main circuit
~
The dashed line in the figure shows a user-defined installation.
- - -
Inverter control unit
A41
POUS safety relay
A65
POUS switch (user-defined)
S
POUS indicator lamp (user-defined)
P
Inverter module(s) under inverter unit T11 (only for R8i)
T11.x
STO terminal block
X969
Reset (automatic)
1)
To parallel inverter modules (if any)
2)
Drive module
3)
Operation
Step
Initial status: The drive is in operation, but the motor is
not
running.
The user sets the POUS switch [S] to the open position. This activates the POUS function.
1
The POUS safety relay [A65] de-energizes the XSTO inputs IN1 and IN2 of the inverter control unit
[A41], which activates the drive STO function. The drive shows an indication.
2
The POUS indication lamp [P] comes on.
3
16 Option description