Avoid Unintended Start; Safe Stop Of Fc - Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

2 Safety Instructions and General Warning
2.1.3 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 disconnected, such as load-sharing (linkage of DC intermediate circuit), as well as
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the motor connection for kinetic back-up.
Using VLT AutomationDrive: wait at least 15 minutes.
Shorter time is allowed only if indicated on the nameplate for the specific unit.
Leakage Current
The earth leakage current from the frequency converter exceeds 3.5 mA. To ensure that the earth cable has a good mechanical
connection to the earth connection (terminal 95), the cable cross section must be at least 10 mm
nated separately.
Residual Current Device
This product can cause a D.C. current in the protective conductor. Where a residual current device (RCD) is used for extra protection,
only an RCD of Type B (time delayed) shall be used on the supply side of this product. See also RCD Application Note MN.90.GX.02.
Protective earthing of the VLT AutomationDrive and the use of RCD's must always follow national and local regulations.
NB!
For vertical lifting or hoisting applications it is strongly recommended to ensure that the load can be stopped in case of an emergency
or a malfunction of a single part such as a contactor, etc.
If the frequency converter is in alarm mode or in an over voltage situation, the mechanical brake cuts in.
2.1.4 Before Commencing Repair Work
1. Disconnect the frequency converter from mains
2. Disconnect DC bus terminals 88 and 89 from load share applications
3. Wait for discharge of the DC-link. See period of time on the warning label
4. Remove motor cable

2.1.5 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 (LCP).
• Disconnect the frequency converter from mains whenever personal safety considerations make it necessary to avoid unintended start.
• To avoid unintended start, always activate the [OFF] key 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. Frequency
converter with Safe Stop (i.e. FC 301 in A1 enclosure and FC 302) provides protection against unintended start, if the Safe Stop Terminal 37 is
on low voltage level or disconnected.

2.1.6 Safe Stop of FC 300

The FC 302, and also the FC 301 in A1 enclosure, can perform the safety function
defined in EN 60204-1).
FC 301 A1 enclosure: When Safe Stop is included in the drive, position 18 of Type Code must be either T or U. If position 18 is B or X, Safe Stop Terminal
37 is not included!
Example:
Type Code for FC 301 A1 with Safe Stop: FC-301PK75T4Z20H4TGCXXXSXXXXA0BXCXXXXD0
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Safe Torque Off
MG.33.AC.02 - VLT is a registered Danfoss trademark
®
VLT AutomationDrive FC 300 Operating
2 or 2 times rated earth wires termi-
(As defined by IEC 61800-5-2) or Stop Category 0
Instructions
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