How To Select Your Frequency Converter; Normal/High Overload Torque Mode - Danfoss VLT 5000 Series Design Manual

How to select your frequency converter

A frequency converter must be selected on the basis
of the given motor current at maximum load on the unit.
The rated output current I
higher than the required motor current.

Normal/high overload torque mode

This function enables the frequency converter to per-
form a constant 100% torque, using an oversize motor.
The choice between a normal or a high overload tor-
que characteristic is made in parameter 101.
This is also where to choose between a high/normal
constant torque characteristic (CT) or a high/normal
VT torque characteristic.
If a high torque characteristic is chosen, a rated motor
with the frequency converter obtains up to 160% tor-
que for 1 min. in both CT and VT.
Type code ordering number string
The VLT 5000 series frequency converter is offered in
a large number of variants. On the basis of your order,
the frequency converter is given an ordering number
that can be seen from the nameplate on the unit. The
number may look as follows:
VLT5008PT5B20EBR3DLF10A10C0
This means that the frequency converter is configured
as a:
• 5,5 kW unit at 160% torque (Position 1-7 -
VLT 5008)
• Process control card (Position 8 - P)
• 380-500 V three phase supply (Position 9-10
- T5)
• Bookstyle IP20 enclosure (Position 11-13 -
B20)
12
must be equal to or
VLT,N
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VLT 5000 Design Guide
The frequency converter is supplied for four mains
voltage ranges: 200-240 V, 380-500 V, 525-600 V and
525-690 V.
If a normal torque characteristic is chosen, an oversize
motor allows up to 110% torque performance for up to
1 min. in both CT and VT. This function is used mainly
for pumps and fans, since these applications do not
require an overload torque.
The advantage of choosing a normal torque charac-
teristic for an oversize motor is that the frequency
converter will be able constantly to yield 100% torque,
without derating as a result of a bigger motor.
NB!
This function cannot be chosen for VLT
5001-5006, 200-240 Volts, and VLT
5001-5011, 380-500 Volts.
• Extended hardware version with brake (Po-
sition 14-15 - EB)
• Built in RFI filter (Position 16-17 - R3)
• Supplied with display (Position 18-19 - DL)
• Built in Profibus option (Position 20-22 - F10)
• Built in programmable SyncPos controller
(Position 23-25 - A10)
• Uncoated printed circuit boards (Position
26-27 - C0)
Variants and options possible
In the following you will find an overview of possible
variants that can be put together. Please refer to the
description of the designation below.
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MG.52.B2.02 - VLT is a registered Danfoss trademark