8. Safe Torque Off (STO) function
Safe Torque Off (STO) is a safety function with the purpose to stop
the motor from turning, without actively braking it. It follows the
definition by EN61800-5-2.
For instructions on how to activate and operate the Safe Torque Off
(STO) function, read these installation and operating instructions.
QR92916582
Safe Torque Off
Installation and operating instructions
http://net.grundfos.com/qr/i/92916582
8.1 Identification of the Safe Torque Off (STO) function
The version of the Safe Torque Off (STO) function is marked on the
nameplate, after the product version number.
The Safe Torque Off (STO) functionality is only available for MGE,
MLE motors having an STO version number.
The Safe Torque Off (STO) version number is shown below as Szz,
where zz marks the version. For product without STO the zz
segment will be blank.
TM084339
The Safe Torque Off (STO) safety function cannot be retrofitted to
older motors.
9. Servicing the product
The product must only be serviced by qualified service
persons.
WARNING
Rotating parts
Death or serious personal injury
‐ All service and maintenance related work on the
product must be carried out by qualified service
persons.
‐ Stay clear of the product after switching on power, as
the shaft can rotate immediately.
‐ Make sure to install a protective cover before powering
on the product.
WARNING
Electric shock
Death or serious personal injury
‐ Switch off the power supply to the product including
the power supply for the signal relays. Wait at least 5
minutes before you make any connections in the
terminal box. Make sure that the power supply cannot
be switched on accidentally.
‐ Tighten the cable glands to the recommended torques.
‐ For measuring mains voltage, use the measuring
points accessible through the holes on the cover for
mains cables.
‐ Follow the instructions in the service instructions for
the motor. If parts are damaged, order new service
kits.
‐ Connect the product to protective earth and provide
protection against indirect contact in accordance with
local regulations.
For recommended torques, see the section on technical
data.
WARNING
Magnetic field
Death or serious personal injury
‐ Do not handle the motor or rotor if you have a
pacemaker.
WARNING
Crushing of hands
Death or serious personal injury
‐ Follow the instructions in the service instructions for
the motor.
‐ Wear protective gloves when servicing the product.
‐ Be careful when handling magnetised parts to avoid
personal injury.
WARNING
Falling objects
Death or serious personal injury
‐ Follow the lifting instructions for the product.
‐ Use lifting equipment rated for the weight of the
product.
For lifting instructions, see the service instructions
provided with the product.
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