General Warning; Before Commencing Repair Work; Special Conditions - Danfoss VLT HVAC Drive Instruction 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 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:
4
Warning:
Touching the electrical parts may be fatal - even after the equipment has been dis-
connected 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
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
According to IEC 61800-5-1, a reinforced protective ground connection must be en-
sured 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
always follow national and local regulations.
Disconnect the adjustable frequency drive from the line power.
Disconnect DC bus terminals 88 and 89.
Wait at least as long as the time mentioned in section 2.1.2.
Remove motor cable.
MG.11.A4.22 - VLT
VLT
® HVAC Drive FC 100, wait at
®
HVAC Drive FC 100 exceeds 3.5 mA.
® HVAC Drive FC 100 and the use of RCDs must
® is a registered Danfoss trademark
® HVAC Drive Instruction Manual