ABB ACS800-U1 Application Guide

16 Installation
Specifications of the STO input:
• Connector pitch: 5.08 mm, maximum wire size 2.5 mm
2
• Operation voltage: 24 V DC +/- 10%
• Logic levels: "0" < 5 V DC, "1" > 17 V DC
• For the drive to start, both STO inputs must be "1".
• Current consumption: 20 mA per STO channel.
Note: If an external power supply is used for the STO, the power supply must have over-
voltage and over-current protections.
Note: For STO input connection diagrams and pin numbers, see the following connection
diagrams.
 Activation switch
The activation switch is shown in the diagram on page 22 as well as in the Safe torque off
with safety relay examples. This represents a component such as a manually operated
switch, an emergency stop push button, the contacts of a safety relay or a safety PLC.
If a manually operated activation switch is used, the switch must be of a type that can be
locked out to the open position.
 Cable types and lengths
Cable between STO activation switch and drive/inverter module or ASTO board
The cable from the STO activation switch runs to the drive/inverter module connector in
frame sizes R2i-R8i and R7-R8. In frame sizes R2-R6, the cable runs from the STO
activation switch to an external ASTO board. This cable is not included in the delivery but it
must be acquired by the customer. Make sure that it meets the specifications in this
section.
A single-shielded twisted-pair cable is required.
Maximum cable lengths:
• 300 m (980 ft) between the activation switch and ASTO board.
Cable between ASTO board and drive/inverter module
Only the WSTO wire harnesses supplied with the Safe torque off option board can be used
between the ASTO and the INT board within the drive/inverter module. The SIL/PL
classification is only valid when the WSTO wire harnesses are used.
Drive modules, frame sizes R2...R6 with an external ASTO board
Use only the cable ordered for the ASTO board and included in the delivery (type WSTO).
Several cable lengths are available. The options are shown in the table below.
WARNING! Drive modules, frame sizes R2...R6: For connecting the ASTO board
and the module, use only the wire kits delivered by ABB. If you use other cables or
modify the cables, you may cause a malfunction of the drive.
Name Length (mm) Code
WSTO-02 185 3AUA0000067819
WSTO-03 305 3AUA0000067820
WSTO-04 3000 3AUA0000067823
WSTO-05 10000 3AUA0000067826

ABB ACS800-U1 Specifications

General

Brand	ABB
Model	ACS800-U1
Category	Controller
Language	English