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3 VLT Automation VT Drive Selection
Do not combine low voltage parts and PELV systems.
3.6.8 24 V Back-Up Option MCB 107 (Option D)
3
External 24 V DC Supply
An external 24 V DC supply can be installed for low-voltage supply to the control card and any option card installed. This enables full operation of the
LCP (including the parameter setting) and field busses without mains supplied to the power section.
External 24 V DC supply specification:
Input voltage range
Max. input current
Average input current for the frequency converter
Max cable length
Input capacitance load
Power-up delay
The inputs are protected.
Terminal numbers:
Terminal 35: - external 24 V DC supply.
Terminal 36: + external 24 V DC supply.
Follow these steps:
1.
Remove the LCP or Blind Cover
2.
Remove the Terminal Cover
3.
Remove the Cable De-coupling Plate and the plastic cover un-
derneath
4.
Insert the 24 V DC Backup External Supply Option in the Option
Slot
5.
Mount the Cable De-coupling Plate
6.
Attach the Terminal Cover and the LCP or Blind Cover.
When MCB 107, 24 V backup option is supplying the control circuit, the
internal 24 V supply is automatically disconnected.
84
MG.20.X1.22 - VLT
Remote Site Products - 1-888-532-2706 - www.remotesiteproducts.com
http://www.remotesiteproducts.com/p-20783-Danfoss-131X8145-VLT-Automation-VT-Drive-VFD-FC322-460V-.5-HP.aspx
Automation VT Drive FC322 Design Guide
24 V DC ±15 % (max. 37 V in 10 s)
2.2 A
0.9 A
75 m
< 10 uF
< 0.6 s
Illustration 3.21: Connection to 24 V backup supplier (A2-
A3).
®
is a registered Danfoss trademark
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