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Q Where can I find CAD drawings of the VFD series?
A You can find them on Delta’s download center.
Q How to read/write parameters via serial communication?
Which address to use?
A To read/write parameters in the drives via serial communication, the parameter
number is also the address. However, the address is in Hex format.
Please see examples below:
Pr05-14 = 050Dh
Pr10-03 = 0A03h
Q When and how are the DC-link capacitors to be recharged?
A The drive’s DC link capacitors need to be recharged if the drive has been non-
operational for more than one year. Without recharging, the capacitors may be
damaged when the drive is powered up. The recharging methods are introduced in
the application note Guide For Capacitor Recharging in Delta AC Motor
Drives.pdf which you can download from our ftp-site (Industrial Automation
Products\AMD\General VFD\VFD-General Applications).
Q How to select the potentiometer for the AVI analogue input?
A See the circuit diagram and curves below:
Assume the AVI input resistance is R Ω and the potentiometer value is aR Ω, where
“a” is a ratio.
In the curves diagram the black line represents a fully linear response when the
potentiometer is moved from 0 to 100%.
The green and red curves show the response depending on “a”, the larger “a” is, the
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40 50 60 70 80 90 100
a=0.1
a=0.2
a=0.5
a=1
a=2
linear
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