Danfoss VLT HVAC Drive FC 100 Series Design Manual page 58

3. VLT HVAC Drive Selection
Analog inputs - terminal X42/1-6
Parameter group for read out: 18-3* See also
Parameter groups for set-up: 26-0*, 26-1*, 26-2* and 26-3* See also
VLT HVAC Drive Programming Guide.
3 x Analog inputs
3
Used as
temperature
sensor input
Used as
voltage input
When used for voltage, analog inputs are scalable by parameters for each input.
When used for temperature sensor, analog inputs 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.
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
Parameter group for read out and write: 18-3* See also
Parameter groups for set-up: 26-4*, 26-5* and 26-6* See also
3 x Analog outputs Output signal level Resolution Linearity
Volt 0-10 VDC
Analog outputs are scalable by parameters for each output.
The function assigned is selectable via a parameter and have same options as for analog outputs on control card.
For a more detailed description of parameters, please refer to the
Real-time clock (RTC) with back-up
The 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 frequency converter is operating at 40 °C ambient temperature. If
battery pack back-up fails, analog I/O option must be exchanged.
3.1.10. 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 variety
of different resistors that are specially designed to our frequency converters. See the section
resistors. Code numbers can be found in the section
58
VLT HVAC Drive Programming Guide.
Operating range Resolution
-50 to +150 °C 11 bits
0 - 10 VDC 10 bits
VLT HVAC Drive Programming Guide
11 bits 1% of full scale 1 mA
How to order
MG.11.B7.02 - VLT
Accuracy Sampling
-50 °C 3 Hz
±1 Kelvin
+150 °C
±2 Kelvin
0.2% of full
scale at cal. 2.4 Hz
temperature
VLT HVAC Drive Programming Guide
Max load
VLT HVAC Drive Programming Guide
Control with brake function
.
® is a registered Danfoss trademark
®
VLT HVAC Drive Design Guide
Max load Impedance
- -
+/- 20 V Approximately
continuously 5 kΩ
.
for the dimensioning of brake