Back-Up Option Mcb 107 (Option D) - Danfoss VLT HVAC Drive FC 102 Design Manual

Selection
3.1.7 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 fieldbuses 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 underneath
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.
Illustration 3.6 Connection to 24 V Backup Supplier (A2-A3).
MG16C202
Design Guide
Illustration 3.7 Connection to 24 V Backup Supplier (A5-C2).
Danfoss A/S © Rev. 05/2014 All rights reserved.
24 V DC ±15 % (max. 37 V in 10 s.)
< 10 uF
< 0.6 s.
3 3
2.2 A
0.9 A
75 m
53