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10.6 24 V Backup Option MCB 107
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) without connection to line power.
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 AutomationDrive FC 302
0.9 A
Max cable length
246 ft [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 un-
derneath
4.
Insert the 24 V DC Backup 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 backup option is supplying the control circuit, the
internal 24 V supply is automatically disconnected.
Figure 10.3: Connection to 24 V back-up supply on frame
sizes A2 and A3.
Figure 10.4: Connection to 24 V backup supply on frame
sizes A5, B1, B2, C1 and C2.
10 Options and Accessories
FC 300 Design Guide
10-12
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
10