1.1.4 General Warning
Warning:
Touching the electrical parts may be fatal - even after the equipment has been disconnected from line power.
Also make sure that other voltage inputs have been disconnected (linkage of DC intermediate circuit), as well as the motor connection
for kinetic backup.
Before touching any potentially live parts of the VLT
®
HVAC Drive FC 100, wait at least as long as follows:
200-240 V, 1.5-5 hp [1.1 - 3.7 kW]: wait at least 4 minutes.
200-240 V, 7.5-60 hp [5.5 - 45 kW]: wait at least 15 minutes.
380-480 V, 1.5-10 hp [1.1 - 7.5 kW]: wait at least 4 minutes.
380-480 V, 15-125 hp [11 - 90 kW]: wait at least 15 minutes.
525-600 V, 1.5-10 hp [1.1 - 7.5 kW]: wait at least 4 minutes.
A shorter time is allowed only if indicated on the nameplate for the specific unit.
Leakage Current
The ground leakage current from the VLT
®
HVAC Drive FC 100 exceeds 3.5 mA. According to IEC 61800-5-1, a reinforced protective
ground connection must be ensured by means of: a min. 0.015 in² [10 mm²] Cu or 0.025 in² [16 mm²] Al PE wire or an additional PE
wire, with the same cable cross-section as the line power wiring, must be terminated separately.
Residual Current Device
This product can cause DC current in the protective conductor. If a residual current device (RCD) is used for extra protection, only an
RCD of Type B (time delayed) may be used on the supply side of this product. See also RCD Application Note MN.90.GX.02.
Protective grounding of the VLT
®
HVAC Drive FC 100 and the use of RCDs must always follow national and local regulations.
1.1.5 Before Commencing Repair Work
1. Disconnect the adjustable frequency drive from the line power.
2. Disconnect DC bus terminals 88 and 89.
3. Wait at least as long as the time mentioned in section 2.1.2.
4. Remove motor cable.
1.1.6 Special conditions
Electrical ratings:
The rating indicated on the nameplate of the adjustable frequency drive is based on a typical 3-phase line power supply within the specified voltage,
current and temperature ranges, which are expected to be used in most applications.
The adjustable frequency drives also support other special applications, which affect the electrical ratings of the adjustable frequency drive.
Special conditions that affect the electrical ratings might be:
î„¿ Single phase applications
î„¿ High temperature applications which require de-rating of the electrical ratings
î„¿ Marine applications with more severe environmental conditions
Other applications might also affect the electrical ratings.
Consult the relevant clauses in these instructions and in the
VLT® HVAC Drive Design Guide, MG.11Bx.yy
for information about the electrical ratings.
1 Safety VLT
®
HVAC Drive Instruction Manual
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MG.11.A5.22 - VLT
®
is a registered Danfoss trademark
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