NOTICE
Carry out a risk assessment to select the correct stop
category for each stop function in accordance with
EN 60204-1.
NOTICE
When designing the machine application, consider
timing and distance for coast to stop (
Stop Category 2
or
STO). See EN 60204-1 for further information.
NOTICE
All signals connected to the STO must be supplied by a
SELV or PELV supply.
2.7.4 Installation
Only Danfoss cables may be used for the installation of the
servo system, however cables from other suppliers may be
used for the user connection to the STO terminals (
STO 1
IN
and
STO 2 IN
) on the SAB.
NOTICE
If the application does not require the Safe Torque Off
(STO) functionality, build a bridge by conn24 V
from the connector
STO 1 IN: +24V
to
STO 1 IN: +STO
,
and from
STO 1 IN: –24 V
to
STO 1 IN: –STO
. Repeat this
process for STO line 2 if used.
Safety relays that have a plus and minus switching output
signal can be directly connected to the VLT
®
Integrated
Servo Drive ISD 510 System to activate STO (see
). Route the wires for STO 1 and STO 2
separately and not in a single multicore cable.
130BE690.10
SAB
STO 1 IN: + STO
STO 1 IN: – STO
STO 2 IN: + STO
STO 2 IN: – STO
Illustration 2.10 Safety Relay with Plus and Minus Switching
Output
Signals with test pulses must not have test pulses of >1
ms. Longer pulses may lead to reduced availability of the
servo system.
2.7.5 Commissioning Test
NOTICE
Perform a commissioning test after installation of the STO function, after every change to the installed function, or after
a safety fault. Perform the test for each STO line.
There are 2 ways to implement the commissioning test depending on the method used to program the PLC, however the
steps of the test are the same:
•
Using the Danfoss Library or the TwinCAT
®
Library.
•
Bit-wise readout of the status.
Commissioning test using libraries
Depending on the application, 1 or both of the following libraries are required to program the commissioning test:
•
Danfoss Library
-
MC_ReadAxisInfo_ISD51x
-
MC_ReadStatus_ISD51x
-
MC_ReadAxisError_ISD51x
-
MC_Reset_ISD51x
•
TwinCAT
®
Library
-
MC_ReadStatus
-
MC_ReadAxisError
-
MC_Reset
System Overview
Design Guide
MG36C102
Danfoss A/S © 08/2017 All rights reserved.
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