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

1. Safety

1.1.4. General Warning

1

1.1.5. Before Commencing Repair Work

1.
2.
3.
4.

1.1.6. 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 ex-
pected 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 de-rating of the electrical ratings
□ Marine applications with more severe environmental conditions.
Other applications might also affect the electrical ratings.
4
Warning:
Touching the electrical parts may be fatal - even after the equipment has been dis-
connected from mains.
Also make sure that other voltage inputs have been disconnected, (linkage of DC
intermediate circuit), as well as the motor connection for kinetic back-up.
Before touching any potentially live parts of the VLT
least as follows:
200 - 240 V, 1.1 - 3.7 kW: wait at least 4 minutes.
200 - 240 V, 5.5 - 45 kW: wait at least 15 minutes.
380 - 480 V, 1.1 - 7.5 kW: wait at least 4 minutes.
380 - 480 V, 11 - 90 kW, wait at least 15 minutes.
525 - 600 V, 1.1 - 7.5 kW, wait at least 4 minutes.
Shorter time is allowed only if indicated on the nameplate for the specific unit.
Leakage Current
The earth leakage current from the VLT
cording 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 de-
layed) shall be used on the supply side of this product. See also RCD Application
Note MN.90.GX.02.
Protective earthing of the VLT
follow national and local regulations.
Disconnect the frequency converter from mains
Disconnect DC bus terminals 88 and 89
Wait at least the time mentioned in section 1.1.6
Remove motor cable
MG.11.A4.02 - 09.10.06. VLT
®
VLT
®
HVAC Drive FC 100, wait at
® HVAC Drive FC 100 exceeds 3.5 mA. Ac-
® HVAC Drive FC 100 and the use of RCD's must always
® is a registered Danfoss trademark
HVAC Drive Operating Instructions