Danfoss VLT Series Design Manual page 81

VLT ® HVAC Drive Design Guide
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
gramming Guide
3 x analog
inputs
Used as
tempera-
sensor input
Used as
voltage in-
When used for voltage, analog inputs are scalable by parameters for each input.
When used for temperature sensor, analog input scaling is preset to necessary signal level for
specified temperature range.
When analog inputs are used for temperature sensors, it is possible to read out feedback values
in both °C and °F.
When operating with temperature sensors, the maximum cable length to connect sensors is 262
ft [80 m] with non-shielded/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
Guide
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 parameter and has the same options as for analog outputs
on the control card.
NOTE
Please note the values available within the different standard groups of resistors:
E12: Closest standard value is 470Ω, creating an input of 449.9Ω and 8.997 V.
E24: Closest standard value is 510Ω, creating an input of 486.4Ω and 9.728 V.
E48: Closest standard value is 511Ω, creating an input of 487.3Ω and 9.746 V.
E96: Closest standard value is 523Ω, creating an input of 498.2Ω and 9.964 V.
Operating Resolu-
range tion
-58°- +302° F 11 bits
[-50° - +150°
ture C]
0-10 VDC 10 bits
put
0-10 VDC
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
VLT® HVAC Drive Programming Guide
Sam-
Accuracy Max load
pling
-58° F [-50° C] 3 Hz
±1 Kelvin
+302° F
[+150° C]
±2 Kelvin
0.2% of full
+/- 20 V
scale at cal. 2.4 Hz
continuously
temperature
VLT® HVAC Drive Programming Guide
VLT® HVAC Drive Programming
11 bits 1% of full scale 1 mA
3. VLT HVAC Selection
VLT® HVAC Drive Pro-
Impe-
dance
- -
Approxi-
mately
5 kΩ
Max load
81
3