FC 300 Design Guide
Introduction to FC 300
" Ground Leakage Current
130BA024.11
Warning:
Touching the electrical parts may be fatal - even after the
equipment has been disconnected from the power supply.
Also make sure that other voltage inputs have been
disconnected, such as load-sharing (linkage of DC intermediate
circuit), as well as the motor connection for kinetic back-up.
Using VLT AutomationDrive FC 300 (at and below 7.5 kW):
wait at least 2 minutes
Leakage Current
The ground leakage current from the FC 300 exceeds 3.5 mA. To ensure that the ground cable
has a good mechanical connection to the ground connection (terminal 95), the cable c ross section
must be at least 0.4 in
2
(10 mm
2
)or2
rated ground wires terminated separately.
Residual Current Device
This product can cause a DC current in the protective conductor. Where a residual current device
(RCD) is use d for extra protect
ion, 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 grounding of the adjustable frequency drive and the use of RCDs must
always follow national and lo
cal regulations.
" Extreme Running Conditions
Short C ircuit
Theadjustablefrequenc
y drive is protected against short circuits by mea ns of cur rent me asurement
in each of the three motor phases. A short circuit between two output phases will cause an
overcurrent in the inverter. However, each transistor of the inverter will be turned off individually
when the short circu
it current exceeds the permitted value.
To protect the drive a gainst a short circuit at the load sharing and brake outputs, please
see the design guidelines for these ports.
After 5-10 µs, the gate driver turns off the inverter and the adjustable frequency drive displays
afaultcode,depen
ding on impedance and motor frequency.
Ground Fault
The inverter cuts out within a few µs in case of a ground fault on a motor phase,
depending on impedance and motor frequency.
52
MG.33.B3.22 - VLT is a registered Danfoss trademark
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