User Manual

TMCM-1140 V1.3 Hardware Manual (Rev. 1.04 / 2015-JAN-05) 6
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3 Mechanical and Electrical Interfacing
3.1 Dimensions and Mounting Holes
The dimensions of the controller/driver board are approx. 37 mm x 37 mm x 11.5 mm in order to fit on
the back of a 42 mm stepper motor. Maximum component height (height above PCB level) without
mating connectors is around 8mm above PCB level and 2 mm below PCB level. There are two mounting
holes for M3 screws for mounting to a NEMA17 stepper motor.
34
2xM3
37
34
37
3
3
Figure 3.1 Dimensions of TMCM-1140 and position of mounting holes
3.2 Board mounting considerations
The TMCM-1140 offers two metal plated mounting holes. Both mounting holes are connected to system
and signal ground (same as power supply ground).
In order to minimize distortion of signals and radiation of HF signals (improve EMC compatibility)
especially in sensitive / noisy environments it is important to ensure a solid ground connection within
the system. In order to support this, it is recommended to connect both mounting holes of the board in
addition to the supply ground connection to system power supply ground.
Nevertheless, this might not always be an option e.g. in case the metal system chassis / TMCM-1140
mounting plate is already connected to earth and a direct connection between supply ground (secondary
side) and mains supply earth (primary side) is not desired / not an option. In this case plastic (e.g. made
of nylon) spacers / distance bolts and screws should be used.