Safe Torque Off Installation And Set-Up; Protective Measures - Danfoss VLT CDS 303 Operating Instructions Manual

Safety Instructions and Gen...
Liability Conditions
Ensure that qualified personnel installs and operates 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 relevant Design Guide
•
Have a good knowledge of the generic and safety
standards applicable to the specific application
User is defined as:
•
integrator
•
operator
•
service technician
•
maintenance technician
Standards
Use of Safe Torque Off on terminal 37 requires fulfilling of
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 of the relevant Design Guide must be followed.

Protective Measures

•
Qualified and skilled personnel are required for
installation and commissioning of safety
engineering systems
•
The unit must be installed in an IP54 cabinet or
in an equivalent environment. In special
applications, a higher IP degree is required
•
The cable between terminal 37 and the external
safety device must be short circuit protected
according to ISO 13849-2 table D.4
•
When external forces influence the motor axis (for
example, suspended loads), more measures are
MG34M422
Operating Instructions

Safe Torque Off Installation and Set-Up

WARNING
SAFE TORQUE OFF FUNCTION!
The Safe Torque Off function does NOT isolate mains
voltage to the frequency converter or auxiliary circuits.
Perform work on electrical parts of the frequency
converter or the motor only after isolating the mains
voltage supply and waiting the length of time specified
in chapter 2.1 Safety and Warnings. Failure to isolate the
mains voltage supply from the unit and waiting the time
specified could result in death or serious injury.
•
•
•
To perform a safe installation of the frequency converter,
follow these steps:
1.
2.
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
required (for example, a safety holding brake) to
eliminate potential hazards
It is not recommended to stop the frequency
converter by using the Safe Torque Off function.
If a running frequency converter is stopped by
using the function, the unit trips and stops by
coasting. If unacceptable or dangerous, use
another stop mode to stop the frequency
converter and machinery, before using this
function. Depending on the application, a
mechanical brake can be required.
For synchronous and permanent magnet motor
frequency converters, in a multiple IGBT power
semiconductor failure: In spite of the activation of
the Safe Torque Off function, the 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 system or affected area
of a machine only. It does not provide electrical
safety. Do not use this function as a control for
starting and/or stopping the frequency converter.
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 2.2.)
Connect an external Safety monitoring relay via a
NO safety function to terminal 37 (Safe Torque
Off) and either terminal 12 or 13 (24 V DC).
Follow the instruction for the safety device. The
Safety monitoring relay must comply with
Category 3 /PL "d" (ISO 13849-1) or SIL 2 (EN
62061).
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