Leakage Current; Residual Current Device; Avoid Unintended Start; Safe Torque Off - Danfoss VLT CDS 303 Operating Instructions Manual

Safety Instructions and Gen...
•
The ground leakage current exceeds 3.5 mA
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The [Off] key is not a safety switch. It does not
disconnect the frequency converter from mains

2.1.6 General Warning

WARNING
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains. Also
make sure that other voltage inputs have been discon-
nected, such as load-sharing (linkage of DC intermediate
circuit).
®
Using VLT Compressor Drives: Wait at least 15 minutes.
Shorter time is allowed only if indicated on the
nameplate for the specific unit.

2.1.7 Leakage Current

CAUTION
The ground leakage current from the frequency
converter exceeds 3.5 mA. Ensure good mechanical
ground connection (terminal 95) to the ground cable.
Use at least 10 mm 2 cable cross section or 2 times rated
ground wires terminated separately.

2.1.8 Residual Current Device

CAUTION
This product can cause a DC current in the protective
conductor. Where a ground fault interrupter (GFI) is used
for extra protection, only use an GFI of Type B (time
delayed) on the supply side of this product. See also RCD
Application Note, MN90G. Protective grounding of the
frequency converter and the use of RCDs must always
follow local and national regulations.

2.1.9 IT Mains

CAUTION
Do not connect 400 V frequency converters with RFI-
filters to mains supplies with a voltage between phase
and ground of more than 440 V. For IT mains and delta
ground (grounded leg), mains voltage may exceed 440 V
between phase and ground. To disconnect the internal
RFI capacitors from the RFI filter to ground, use 14-50 RFI
1 on the frequency converter. This procedure reduces the
RFI performance to A2 level.
MG34M422
Operating Instructions

2.1.10 Avoid Unintended Start

While the frequency converter is connected to mains, the
motor can be started/stopped using:
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•
•
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Disconnect the frequency converter from mains whenever
personal safety considerations make it necessary to avoid
unintended start. To avoid unintended start, always press
[OFF] before changing parameters. An electronic fault,
temporary overload, a fault in the mains supply, or lost
motor connection may cause a stopped motor to start. A
frequency converter with Safe Torque Off provides a
certain degree of protection against such unintended start,
if the Safe Torque Off Terminal 37 is on low voltage level
or disconnected.

2.2 Safe Torque Off

The frequency converter can perform the safety function
Safe Torque Off (STO, as defined by EN IEC 61800-5-2
Stop Category 0 (as defined in EN 60204-1
Before integration and use of Safe Torque Off in an instal-
lation, perform a thorough risk analysis to determine
whether the Safe Torque Off functionality and safety levels
are appropriate and sufficient. Safe Torque Off is designed
and approved suitable for the requirements of:
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•
•
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1)
Refer to EN IEC 61800-5-2 for details of Safe torque off
(STO) function.
2)
Refer to EN IEC 60204-1 for details of stop category 0
and 1.
Activation and Termination of Safe Torque Off
The Safe Torque Off (STO) function is activated by
removing the voltage at terminal 37 of the safe inverter. By
connecting the safe inverter to external safety devices
providing a safe delay, an installation for a Safe Torque Off
Category 1 can be obtained. The Safe Torque Off function
can be used for asynchronous, synchronous, and
permanent magnet motors.
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
digital commands
bus commands
references
via the Local Control Panel (LCP)
Safety Category 3 in EN 954-1 (and EN ISO
13849-1)
Performance Level "d" in EN ISO 13849-1:2008
SIL 2 Capability in IEC 61508 and EN 61800-5-2
SILCL 2 in EN 62061
2
1
) and
2
).
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