3.8.8. 24 V Back-Up Option MCB 107 (Option D)
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
fieldbusses without mains supplied to the power section.
External 24 V DC supply specification:
Input voltage range
24 V DC ±15 % (max. 37 V in 10 s)
Max. input current
2.2 A
Average input current for the frequency converter
0.9 A
Max cable length
75 m
Input capacitance load
< 10 uF
Power-up delay
< 0.6 s
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 Decoupling Plate
and the plastic cover underneath
4.
Insert the 24 V DC Back-up External
Supply Option in the Option Slot
5.
Mount the Cable Decoupling Plate
6.
Attach the Terminal Cover and the
LCP or Blind Cover.
When MCB 107, 24 V back-up option is sup-
plying the control circuit, the internal 24 V
supply is automatically disconnected.
Illustration 3.11: Connection to 24 V back-up sup-
plier (A2-A3).
Illustration 3.12: Connection to 24 V back-up sup-
plier (A5-C2).
VLT
®
HVAC Drive Design Guide
3. VLT HVAC Selection
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
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