Danfoss VLT Series Design Manual page 63

VLT ® HVAC Drive Design Guide
Pulse inputs:
Programmable pulse inputs
Terminal number pulse
Max. frequency at terminal, 29, 33
Max. frequency at terminal, 29, 33
Min. frequency at terminal 29, 33
Voltage level
Maximum voltage on input
Input resistance, R
Pulse input accuracy (0.1-1 kHz)
Analog output:
Number of programmable analog outputs
Terminal number
Current range at analog output
Max. load to common at analog output
Accuracy on analog output
Resolution on analog output
The analog output is galvanically isolated from the supply voltage (PELV) and other high-voltage
terminals.
Control card, RS-485 serial communication:
Terminal number
Terminal number 61
The RS-485 serial communication circuit is functionally separated from other central circuits and
galvanically isolated from the supply voltage (PELV).
Digital output:
Programmable digital/pulse outputs
Terminal number
Voltage level at digital/frequency output
Max. output current (sink or source)
Max. load at frequency output
Max. capacitive load at frequency output
Minimum output frequency at frequency output
Maximum output frequency at frequency output
Accuracy of frequency output
i
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
3. VLT HVAC Selection
29, 33
110 kHz (push-pull driven)
5 kHz (open collector)
see section on Digital input
28 V DC
approx. 4 kΩ
Max. error: 0.1% of full scale
0/4 - 20 mA
500 Ω
Max. error: 0.8% of full scale
68 (P,TX+, RX+), 69 (N,TX-, RX-)
Common for terminals 68 and 69
27, 29
0 - 24 V
40 mA
10 nF
32 kHz
Max. error: 0.1% of full scale
3
2
4 Hz
1
42
8 bit
2
1)
1 kΩ
0 Hz
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