Danfoss VLT HVAC Drive FC 100 Series Design Manual page 55

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VLT HVAC Drive Design Guide
Warning Dual supply
How to add the MCB 105 option:
• See mounting instructions in the beginning of section
• The power to the live part connections on relay terminals must be disconnected.
• Do not mix live parts (high voltage) with control signals (PELV).
• Select the relay functions in par. 5-40 [6-8], 5-41 [6-8] and 5-42 [6-8].
NB! (Index [6] is relay 7, index [7] is relay 8, and index [8] is relay 9)
Do not combine low voltage parts and PELV systems.
3.1.8. 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
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.
Options and Accessories
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
3. VLT HVAC Drive Selection
24 V DC ±15 % (max. 37 V in 10 s)
2.2 A
0.9 A
75 m
< 10 uF
< 0.6 s
3
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