Danfoss VLT FC 102 Series Design Manual page 19

Introduction to VLT® HVAC D...
Liability Conditions
It is the user's responsibility to ensure that personnel
installing and operating the Safe Torque Off function:
•
Read and understand the safety regulations
concerning health and safety/accident prevention
•
Understand the generic and safety guidelines
given in this description and the extended
description in the Design Guide
•
Have a good knowledge of the generic and safety
standards applicable to the specific application
Standards
Use of Safe Torque Off on terminal 37 requires that the
user satisfies all provisions for safety including relevant
laws, regulations and guidelines. The optional Safe Torque
Off function complies with the following standards.
IEC 60204-1: 2005 category 0 – uncontrolled stop
IEC 61508: 1998 SIL2
IEC 61800-5-2: 2007 – safe torque off (STO)
function
IEC 62061: 2005 SIL CL2
ISO 13849-1: 2006 Category 3 PL d
ISO 14118: 2000 (EN 1037) – prevention of
unexpected startup
The information and instructions of the Instruction Manual
are not sufficient for a proper and safe use of the Safe
Torque Off functionality. The related information and
instructions in the relevant Design Guide must be followed.
Protective Measures
•
Safety engineering systems may only be installed
and commissioned by qualified and skilled
personnel
•
The unit must be installed in an IP54 cabinet or
in an equivalent environment. In special
applications, a higher IP degree may be necessary
•
The cable between terminal 37 and the external
safety device must be short-circuit-protected
according to ISO 13849-2 table D.4
•
If any external forces influence the motor axis
(e.g., suspended loads), additional measures
(e.g., a safety holding brake) are required to
eliminate hazards.
MG11BC22
Design Guide
Safe Torque Off Installation and Set-up
WARNING
SAFE TORQUE OFF FUNCTION!
The Safe Torque Off function does NOT isolate AC line
voltage to the adjustable frequency drive or auxiliary
circuits. Perform work on electrical parts of the
adjustable frequency drive or the motor only after
isolating the AC line voltage supply and waiting the
length of time specified under Safety in this manual.
Failure to isolate the AC line voltage supply from the
unit and waiting the time specified could result in death
or serious injury.
•
•
•
Meet the following requirements to perform a safe instal-
lation of the adjustable frequency drive:
1.
2.
Danfoss A/S © Rev. 06/2014 All rights reserved.
It is not recommended to stop the adjustable
frequency drive by using the Safe Torque Off
function. If a running adjustable frequency drive
is stopped by using the function, the unit trips
and stops by coasting. If this is not acceptable,
e.g., causes danger, the adjustable frequency
drive and machinery must be stopped using the
appropriate stopping mode before using this
function. Depending on the application, a
mechanical brake may be required.
Concerning synchronous and permanent magnet
motor adjustable frequency drives in case of a
multiple IGBT power semiconductor failure: In
spite of the activation of the Safe Torque Off
function, the adjustable frequency drive system
can produce an alignment torque which
maximally rotates the motor shaft by 180/p
degrees. p denotes the pole pair number.
This function is suitable for performing
mechanical work on the adjustable frequency
drive system or affected area of a machine only.
It does not provide electrical safety. This function
should not be used as a control for starting
and/or stopping the adjustable frequency drive.
Remove the jumper wire between control
terminals 37 and 12 or 13. Cutting or breaking
the jumper is not sufficient to avoid short-
circuiting. (See jumper on Figure 2.1.)
Connect an external safety monitoring relay via a
NO safety function (the instruction for the safety
device must be followed) to terminal 37 (Safe
Torque Off) and either terminal 12 or 13 (24 V
DC). The Safety monitoring relay must comply
with Category 3/PL "d" (ISO 13849-1) or SIL 2
(EN 62061).
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