Installation - Danfoss VLT ISD 511 Operating Manual

VLT® Servo Drive System ISD 511
Operating Guide
Abbrevia- Reference
tion
PFH EN IEC 61508
PL EN ISO 13849-1
SFF EN IEC 61508
SIL
EN IEC 61508
EN IEC 62061
STO EN IEC 61800-5-2

8.6 Installation

Only Danfoss cables can be used for the installation of the servo system, however cables from other suppliers can be used for the
user connection to the STO terminal STO DAM (Pins 3 and 4) on the Decentral Access Module (DAM 510).
Safety relays that have a plus and minus switching output signal can be directly connected to the servo system to activate STO.
The example in Illustration 55
not supplied by Danfoss. The STO is activated by opening STO+ and STO–.
Table 22: Activation of STO Function
STO+
24 V
Open
24 V
Open
-
Do not exceed 30 V at the STO inputs.
-
STO is activated if the plus input is between –3 V and +3 V.
-
STO is deactivated if the plus input is between +21.6 V and +26.4 V.
Illustration 55: 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.
Danfoss A/S © 2023.08
Description
Unit: years
Probability of dangerous failures per hour
Take this value into account if the safety device is operated in high demand mode or in contin-
uous operating mode, where the frequency of demands for operation made on a safety-rela-
ted system occurs more than once per year.
Performance level
A discrete level used to specify the capability of safety-related parts of a system to perform
safety-oriented functions under foreseeable conditions. Levels: a–e.
Safe failure fraction [%]
Proportion of safe failures and detected dangerous failures of a safety function or a subsystem
as a percentage of all possible failures.
Safety integrity level
Safe Torque Off
shows the basic connection to be made for the STO function. A suitable safety device to switch it off is
STO–
GND
GND
Open
Open
N O T I C E
STO function
STO deactivated
STO activated
STO activated
STO activated
Safety Concept
AQ377148425069en-000101 / 130R1213 | 91