General Warning; Before Commencing Repair Work; Special Conditions - Danfoss VLT FC 102 Operating Instructions Manual

2 Safety

2.1.2 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, (linkage of DC intermediate circuit), as well as the motor connection
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for kinetic back-up.
Before touching any potentially live parts of the frequency converter, wait at least as follows:
380 - 480 V, 160 - 250 kW, wait at least 20 minutes.
380 - 480 V, 315- 710 kW, wait at least 40 minutes.
Shorter time is allowed only if indicated on the nameplate for the specific unit. Be aware that there may be high voltage on the DC
links even when the Control Card LEDs are turned off. A red LED is mounted on a circuit board inside both the drive and the active
filter to indicate the DC bus voltages. The red LED will stay lit until the DC link is 50 Vdc or lower.
Leakage Current
The earth leakage current from the frequency converter exceeds 3.5 mA. According to IEC 61800-5-1 a reinforced Protective Earth
connection must be ensured by means of: a min. 10mm² Cu or 16mm² Al PE-wire or an addtional PE wire - with the same cable cross
section as the Mains wiring - must be terminated 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 frequency converter and the use of RCD's must always follow national and local regulations.

2.1.3 Before Commencing Repair Work

1. Disconnect the frequency converter from mains
2. Disconnect DC bus terminals 88 and 89
3. Wait at least the time mentioned in section General Warning above
4. Remove motor cable

2.1.4 Special conditions

Electrical ratings:
The rating indicated on the nameplate of the frequency converter is based on a typical 3-phase mains power supply, within the specified voltage, current
and temperature range, which is expected to be used in most applications.
The frequency converters also support other special applications, which affect the electrical ratings of the frequency converter. Special
conditions which affect the electrical ratings might be:
• Single phase applications
• High temperature applications which require derating of the electrical ratings
• Marine applications with more severe environmental conditions.
Consult the relevant clauses in these instructions and in the Design Guide for information about the electrical ratings.
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 (IT,TN, grounded leg, etc.)
• Safety of low-voltage ports (PELV conditions).
Consult the relevant clauses in these instructions and in the Design Guide for information about the installation requirements.
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VLT HVAC Low Harmonic Drive Operating In-
®
MG.16.A1.02 - VLT is a registered Danfoss trademark
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