Danfoss VLT HVAC, Design Manual

Page: 58 / 200

NB!
Please note the values available within the different standard groups of resistors:
E12: Closest standard value is 470
Ω
, creating an input of 449.9
Ω
and 8.997V.
E24: Closest standard value is 510
Ω
, creating an input of 486.4
Ω
and 9.728V.
E48: Closest standard value is 511 Ω , creating an input of 487.3 Ω and 9.746V.
E96: Closest standard value is 523 Ω , creating an input of 498.2 Ω and 9.964V.
Analog inputs - terminal X42/1-6
Parameter group for read out: 18-3*. See also VLT HVAC Drive Programming Guide.
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 Operating range Resolution Accuracy Sampling Max load Impedance
Used as
temperature
sensor input
-50 to +150 °C 11 bits -50 °C
±1 Kelvin
+150 °C
±2 Kelvin
3 Hz - -
Used as
voltage input
0 - 10 VDC 10 bits
0.2% of full
scale at cal.
temperature
2.4 Hz
+/- 20 V
continuously
Approximately
5 k Ω
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
VLT HVAC Drive Programming Guide
Parameter groups for set-up: 26-4*, 26-5* and 26-6*. See also
VLT HVAC Drive Programming Guide
3 x Analog outputs Output signal level Resolution Linearity Max load
Volt 0-10 VDC 11 bits 1% of full scale 1 mA
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 VLT HVAC Drive Programming Guide .
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 VLT HVAC Drive Selection VLT ® HVAC Drive Design Guide
58
MG.11.B9.02 - VLT
®
is a registered Danfoss trademark
3