UL STANDARDS ON CABLING
To obey the UL (Underwriters Laboratories)
regulations, use a UL-approved Class 1
copper wire with a minimum heat
resistance of +158 or +167 °F (+70 or +75°C).
You can use the drive on a circuit that gives
a maximum of 50 000 rms symmetrical
amperes, and a maximum of 500 V AC,
when the drive is protected by Class T and
J fuses.
CABLE AND FUSE SIZES,
NORTH AMERICA
The recommended fuse types are class
T (UL & CSA). The fuse voltage rating
should be selected according to the supply
network. The final selection should be
made according to local regulations,
cable installation conditions and cable
specifications. Bigger fuses than those
recommended below shall not be used.
Check that the fuse operating time is less
than 0.4 seconds. Operating time depends
on used fuse type and impedance of the
supply circuit. Consult the factory about
faster fuses. VACON® also recommends
for high speed J (UL & CSA) fuse ranges.
THE TECHNICAL DATA OF THE VACON
®
20 X AC DRIVE
VACON
®
20 X AC DRIVES
INSTALLATION
IN US AND CANADA
Download and read VACON
®
20 X Installation Manual,
wall-mounted drives at:
http://drives.danfoss.com/knowledge-center/
technical-documentation/
The dimensions of the cables must agree
with the requirements of the UL508C.
• The cables must be PVC-isolated.
• The maximum ambient temperature
is +104 °F (+40°C).
• The maximum temperature of the
cable surface is +158 or +167 °F
(+70 or +75°C).
• Use only cables with a concentric
copper shield.
• The maximum number of parallel
cables is 9.
When you use parallel cables, make sure
that you obey the requirements of the
cross-sectional area and the maximum
number of cables.
For important information on the
requirements of the grounding conductor,
see the UL508C.
For the correction factors for each
temperature, see the instructions of the
UL508C.
QUICK GUIDE
DPD01821B
Technical item or function
Technical data
Mains
connection
Input voltage Uin
3AC 208…240V
1AC 208...240V
3AC 380...480V
Input voltage tolerance
-15%…+10% continuously
Input frequency
50/60 Hz
Input frequency tolerance 45…66 Hz
Protection class
I
Connection to mains
Once per minute or less
Starting delay
4 s
Supply network
IT and TN-networks
(cannot be used with corner earthed
networks)
Short-circuit current
Maximum short-circuit current
has to be <50kA
DC connection
Available as standard in
MU2 single-phase frames and MU3
Motor
connection
Output voltage
3AC 0…Uin
Rated output current
IN: Ambient temperature max. +40°C
Overload output current
1.5 x IN (1 min/10 min)
Starting current
IS for 2 s every 20 s (IS = 2.0 * IN)
Output frequency
0…320 Hz
Frequency resolution
0.01 Hz
Protection class
I
Motor characteristics
AC squirrel cage motors
Permanent magnet motors
Cable type
Screened motor cable
Cable maximum length
30 m
Control
characteristics
Switching frequency
Programmable 2…16 kHz;
Default 6 kHz.
Automatic switching frequency
derating in case of overheating
Frequency reference:
Analogue input
Panel reference
Resolution ±0.05% (11-bit),
accuracy ±1% Resolution 0.01 Hz
Field weakening point
8…320 Hz
Acceleration time
0.1…3000 sec
Deceleration time
0.1…3000 sec
Braking
Brake chopper standard in all three-phase
frames. External brake resistor optional.
