Grundfos NBE - STO Installation, Optional

6.5 STO installation, optional
DANGER
Exposure to high pressure or toxic liquids
Death or serious personal injury
‐ Failure to remove the jumper will disable the STO
function and the motor might not stop as intended and
can cause severe injury or death.
‐ Failure to use safety-monitoring relay compliant with
Category 3 /PL "d", ISO 13849-1 or SIL 2, EN 62061
and IEC 61508. Perform a functional test every 12
months to ensure that the system works properly.
To enable the integrated STO, follow these steps:
1. Remove the jumper wire between control terminals 37 and 12
or 13. Cutting or breaking the jumper is not sufficient to avoid
short-circuiting.
12/13
37
TM074595
Remove jumper
2. Connect an external safety-monitoring relay via a NO safety
function to terminal 37 (STO) and either terminal 12 or 13, 24 V
DC.
Select and apply the components in the safety control system
appropriately to achieve the desired level of operational safety.
Before integrating and using STO in an installation, carry out a
thorough risk analysis on the installation to determine whether the
STO functionality and safety levels are appropriate and sufficient.
12
37
1
3
FC
4
2
TM074594
STO wiring
Pos. Description
1 Reset button
2 Safety relay (category 3, PL d or SIL2)
3 Emergency stop button
4
Short-circuit protected cable if the product is not installed
inside an IP54 cabinet.
13
English (US)