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VLT HVAC Drive High Power Operating In-
structions
2 Safety
2.1.1 High Voltage Warning
The voltage of the frequency converter and the MCO
101 option card is dangerous whenever it is connec-
ted to mains. Incorrect installation of the motor or
frequency converter may causedeath, serious injury
or damage to the equipment. Consequently, it is es-
sential to comply with the instructions in this manual
as well as local and national rules and safety regula-
tions.
2.1.2 Safety Instructions
Prior to using functions directly or indirectly influenc-
ing personal safety (e.g. Safe Stop, Fire Mode or
other functions either forcing the motor to stop or at-
tempting to keep it functioning) a thorough risk
analysis and system test must be carried through.
The system tests must include testing failure modes
regarding the control signalling (analog and digital
signals and serial communication.
NB!
Before using Fire Mode, contact Danfoss
2.1.3 General Warning
Warning:
Touching the electrical parts may be fatal - even af-
ter 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 for kinetic back-up.
Before touching any potentially live parts of the fre-
quency converter, wait at least as follows: Be aware
that there may be high voltage on the DC link even
when the Control Card LEDs are turned off. A red
LED is mounted on a circuit board inside the drive to
indicate the DC bus voltage. The red LED will stay lit
until the DC link is 50 Vdc or lower.
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MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
Make sure the frequency converter is properly connected to
earth.
Do not remove mains connections, motor connections or other
power connections while the frequency converter is connected
to power.
Protect users against supply voltage.
Protect the motor against overloading according to national
and local regulations.
The earth leakage current exceeds 3.5 mA.
The [OFF] key is not a safety switch. It does not disconnect
the frequency converter from mains.
Leakage Current
The earth leakage current from the frequency con-
verter exceeds 3.5 mA. According to IEC 61800-5-1 a
reinforced Protective Earth connection must be en-
sured by means of: a min. 10mm² Cu or 16mm² Al
PE-wire or an addtional PE wire - with the same ca-
ble cross section as the Mains wiring - must be termi-
nated separately.
Residual Current Device
This product can cause a D.C. current in the protec-
tive 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 lo-
cal regulations.
2 Safety
2
7
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