Danfoss VLT Series Design Manual page 75

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VLT HVAC Drive Design Guide
Ordering code numbers
Standard version code no: 130B1143
Coated version code no: 130B1243
Analog inputs - terminal X42/1-6
Parameters for read out: 18-2*
3 x Analog
inputs
Used as
tempera-
sensor input
Used as
voltage in-
When used for voltage, analog inputs are scal-
able by parameters for each input.
When used for temperature sensor, analog in-
puts scaling is preset to necessary signal level
for specified temperature span.
When analog inputs are used for temperature
sensors, it is possible to read out feedback
value in both °C and °F.
3 x Analog outputs Output signal level Resolution Linearity
Volt
Analog outputs are scalable by parameters for
each output.
The function assigned is selectable via a pa-
rameter and have same options as for analog
outputs on control card.
3.8.10. Brake Resistors
In applications where the motor is used as a brake, energy is generated in the motor and send
back into the frequency converter. If the energy can not be transported back to the motor it will
increase the voltage in the converter DC-line. In applications with frequent braking and/or high
inertia loads this increase may lead to an over voltage trip in the converter and finally a shut down.
Brake resistors are used to dissipate the excess energy resulting from the regenerative braking.
The resistor is selected in respect to its ohmic value, its power dissipation rate and its physical
size. Danfoss offers a wide verity of different resistors that are specially designed to our drive code
numbers can be found in section
Operating Resolu-
range tion
-50 to +150 °C 11 bits
ture
0 - 10 VDC 10 bits
put
0-10 VDC
How to order
®
MG.11.B2.02 - VLT is a registered Danfoss trademark
Parameters for set-up: 26-0*, 26-1*, 26-2*
and 26-3*
Sam-
Accuracy
pling
-50 °C 3 Hz
±1 Kelvin
+150 °C
±2 Kelvin
- -
continuously
When operating with temperature sensors,
maximum cable length to connect sensors is
80 m non-screened / non-twisted wires.
Analog outputs - terminal X42/7-12
Parameters for read out: 18-2*
Parameters for set-up: 26-5*, 26-6* and
26-7*
Max load
11 bits 1% of full scale 1 mA
Real-time clock (RTC) with back-up
Data format of RTC includes year, month,
date, hour, minutes and weekday.
Accuracy of clock is better than ± 20 ppm at
25° C.
The built-in lithium back-up battery lasts on
average for minimum 10 years, when frequen-
cy converter is operating at 40° C ambient
temperature. If battery pack back-up fails, an-
alog I/O option must be exchanged.
.
3. VLT HVAC Selection
Max load Impedance
- -
Approxi-
+/- 20 V
mately
5 kΩ
3
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