User Manual
18 of 37
Revision 1.0
2018-08-23
EVAL-M1-CTF620N3 User Manual
iMOTION
™
Modular Application Design Kit
Hardware description of EVAL-M1-CTF620N3
5.1.1
DC bus sensing and MCEWizard configuration
Pin 14 and pin 26 of connector J2 provide access to the DC-link voltage DCBsense. Three possible feedback
cases are associated with these pins. Figure 12 provides the DC bus sense resistor details. By default, the
resistor R7 is not mounted on EVAL-M1-CTF620N3. There must be a pull-down resistor mounted on the
corresponding controller board.
Figure 12 DC bus sense resistor on EVAL-M1-CTF620N3 evaluation board
If a pull down resistor of 13.3 kΩ referred to ground is inserted either on the EVAL-M1-CTF620N3 evaluation
board or on the control board, the DCBSense voltage results in the range of 0 to 3.3 V on the pin reflecting a DC
bus voltage range of 0 to 420 V.If a pull down resistor of 13.3 kΩ is inserted on both, EVAL-M1-CTF620N3
evaluation board and on the control card, the DCBSense results scale to 0-1.65 V. No safety issue occurs. If no
feedback is desired on the DCBSense pin, R4, R5, R6 or R8 should be removed to avoid high voltage on the
connector.
The high side resistors R4, R5, R6 and R8 for the DC bus sensing resistor divider on the controller board EVAL-
M1-CTF620N3 are 2000kΩ, and should be configured in MCEWizard as shown in Figure 13. For the low side
resistor value, please refer to the User Manual of the corresponding control board.
G
N
D
R
4
50
0K
oh
m
1
/8
W
1
%
R
5
50
0K
oh
m
1
/8
W
1
%
R
6
50
0K
oh
m
1
/8
W
1
%
R
8
50
0K
oh
m
1
/8
W
1
%
R
7
D
N
I
D
C
B
se
ns
e
C
3
D
N
I
1
D
C
B
U
S