Danfoss VLT AHF 005 Design Guide

6.7 Common-mode Filters
High-frequency common-mode cores (HF-CM cores) reduce
electromagnetic interference and eliminate bearing
damage by electrical discharge. They are special nanocrys-
talline magnetic cores that have superior ltering
performance compared to regular ferrite cores. The HF-CM
core acts like a common-mode inductor between phases
and ground.
Installed around the 3 motor phases (U, V, W), the
common mode
lters reduce high-frequency common-
mode currents. As a result, high-frequency electromagnetic
interference from the motor cable is reduced.
For ordering numbers refer to the Output Filters Design
Guide.
6.8 Harmonic Filters
The VLT
®
Advanced Harmonic Filters AHF 005 & AHF 010
should not be compared with traditional harmonic trap
lters. The Danfoss harmonic lters have been specially
designed to match the Danfoss drives.
By connecting the AHF 005 or AHF 010 in front of a
Danfoss drive, the total harmonic current distortion
generated back to the mains is reduced to 5% and 10%.
For ordering numbers and more information on how to
dimension brake resistors, refer to the VLT
®
Advanced
Harmonic Filters AHF 005/AHF 010 Design Guide.
6.9
Enclosure Built-in Options
The following built-in options are specied in the type
code when ordering the drive.
Enclosure with corrosion-resistant back channel
For extra protection from corrosion in harsh environments,
units can be ordered in an enclosure that includes a
stainless steel back channel, heavier plated heat sinks, and
an upgraded fan. This option is recommended in salt-air
environments, such as those near the ocean.
Mains shielding
Lexan
®
shielding can be mounted in front of incoming
power terminals and input plate to protect against physical
contact when the enclosure door is open.
Space heaters and thermostat
Mounted in the cabinet interior of enclosure size F drives
and controlled via an automatic thermostat, space heaters
controlled via an automatic thermostat prevent conden-
sation inside the enclosure.
The thermostat default settings turn on the heaters at
10 °C (50 °F) and turn them
o at 15.6 °C (60 °F).
Cabinet light with power outlet
To increase visibility during servicing and maintenance, a
light can be mounted on the cabinet interior of enclosure
F drives. The light housing includes a power outlet for
temporarily powering laptop computers or other devices.
Available in 2 voltages:
•
230 V, 50 Hz, 2.5 A, CE/ENEC
•
120 V, 60 Hz, 5 A, UL/cUL
RFI lters
VLT
®
drive series feature integrated Class A2 RFI lters as
standard. If extra levels of RFI/EMC protection are required,
they can be obtained using optional Class A1 RFI lters,
which provide suppression of radio frequency interference
and electromagnetic radiation in accordance with EN
55011. Marine use RFI lters are also available.
On enclosure size F drives, the Class A1 RFI lter requires
the addition of the options cabinet.
Insulation resistance monitor (IRM)
Monitors the insulation resistance in ungrounded systems
(IT systems in IEC terminology) between the system phase
conductors and ground. There is an ohmic pre-warning
and a main alarm setpoint for the insulation level.
Associated with each setpoint is an SPDT alarm relay for
external use. Only 1 insulation resistance monitor can be
connected to each ungrounded (IT) system.
•
Integrated into the safe-stop circuit.
•
LCD display of insulation resistance.
•
Fault memory.
•
Info, test, and reset key.
Residual current device (RCD)
Uses the core balance method to monitor ground fault
currents in grounded and high-resistance grounded
systems (TN and TT systems in IEC terminology). There is a
pre-warning (50% of main alarm setpoint) and a main
alarm setpoint. Associated with each setpoint is an SPDT
alarm relay for external use. Requires an external window-
type current transformer (supplied and installed by
customer).
•
Integrated into the safe-stop circuit.
•
IEC 60755 Type B device monitors, pulsed DC,
and pure DC ground fault currents.
•
LED bar graph indicator of the ground fault
current level from 10–100% of the setpoint.
•
Fault memory.
•
Test and reset key.
Safe Torque
O with Pilz safety relay
Available for drives with enclosure size F. Enables the Pilz
relay to t in the enclosure without requiring an options
cabinet. The relay is used in the external temperature
monitoring option. If PTC monitoring is required, order the
VLT
®
PTC Thermistor Card MCB 112.
Options and Accessories Ove... Design Guide
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Danfoss VLT AHF 005 Specifications

General

Brand	Danfoss
Model	VLT AHF 005
Category	DC Drives
Language	English