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User Manual

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Revision 1.4

2020-07-16

EVAL-M3-IM564 User Manual

iMOTION™ Modular Application Design Kit

Hardware description of EVAL-M3-IM564

4.2.1

DC bus sensing and MCEWizard configuration

Pin 14 and pin 26 of connector J3 provide access to the DC-link voltage DCBsense. Three possible feedback

cases are associated with these pins. Figure 19 provides the DC bus sense resistor details. By default, the

resistor R21 is not mounted on EVAL-M3-IM564. A pull-down resistor must be mounted on the corresponding

controller board.

Figure 19 DC bus sense resistor on EVAL-M3-IM564 evaluation board

If a pull-down resistor of 13.3 kΩ referred to ground is inserted either on the EVAL-M3-IM564 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 the EVAL-M3-IM564 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, R6 or R14 should be removed to avoid high voltage on the connector.

The high-side resistors R6 and R14 for the DC bus sensing resistor divider on the controller board EVAL-M3-

IM564 are 2000 kΩ, and should be configured in MCEWizard as shown in Figure 20. For the low-side resistor

value, please refer to the User Manual of the corresponding control board (typical is 13.3 kΩ).

Figure 20 DC bus sensing configuration in MCEWizard

DCBsense

R14

1.00M, 1%

R21

DNI

DCBSense

DCBUS

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