Avoid Unintended Start; Safe Stop Of The Frequency Converter - Danfoss FC 100 Series Operating Instructions Manual

Safety
Installation requirements:
The overall electrical safety of the frequency converter
requires special installation considerations regarding:
•
Fuses and circuit breakers for over-current and short-
circuit protection
•
Selection of power cables (mains, motor, brake,
loadsharing and relay)
•
Grid configuration (grounded delta transformer leg,
IT,TN, etc.)
•
Safety of low-voltage ports (PELV conditions).
Consult the relevant clauses in these instructions and in the
VLT HVAC Drive Design Guide for information about the instal-
lation requirements.
2.1.6 Installation at High Altitudes (PELV)
Hazardous Voltage!
By altitudes above 2 km, please contact Danfoss regard-
ing PELV.
Avoid un-intended start
While the frequency converter is connected to mains,
the motor can be started/stopped using digital
commands, bus commands, references or via the LCP.
•
Disconnect the frequency converter from
mains whenever personal safety considera-
tions make it necessary to avoid unintended
start.
•
To avoid unintended start, always activate the
[OFF] key before changing parameters.
•
Unless terminal 37 is turned off, an electronic
fault, temporary overload, a fault in the mains
supply, or lost motor connection may cause a
stopped motor to start.
Failure to follow recommendations could result in death
or serious injury.
®
VLT HVAC Drive Operating Instructions

2.1.7 Avoid Unintended Start

While the frequency converter is connected to mains,
the motor can be started/stopped using digital
commands, bus commands, references or via the Local
Control Panel.

2.1.8 Safe Stop of the Frequency Converter

For versions fitted with a Safe Stop terminal 37 input, the
frequency converter can perform the safety function Safe
Torque Off (As defined by draft CD IEC 61800-5-2) or Stop
Category 0 (as defined in EN 60204-1).
It is designed and approved suitable for the requirements of
Safety Category 3 in EN 954-1. This functionality is called Safe
Stop. Prior to integration and use of Safe Stop in an installa-
tion, a thorough risk analysis on the installation must be
carried out in order to determine whether the Safe Stop
functionality and safety category are appropriate and
sufficient. In order to install and use the Safe Stop function in
accordance with the requirements of Safety Category 3 in EN
954-1, the related information and instructions of the VLT
HVAC Drive Design Guide must be followed! The information
and instructions of the Operating Instructions are not
sufficient for a correct and safe use of the Safe Stop function-
ality!
®
MG.11.AD.02 - VLT is a registered Danfoss trademark
•
Disconnect the frequency converter from
mains whenever personal safety considera-
tions make it necessary to avoid unintended
start.
•
To avoid unintended start, always activate the
[OFF] key before changing parameters.
•
Unless terminal 37 is turned off, an electronic
fault, temporary overload, a fault in the mains
supply, or lost motor connection may cause a
stopped motor to start.
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