User Manual

TMCM-1180 and PD86-1180 Hardware Manual (V1.03 / 2011-DEC-02) 11

4.3.1 Power connector

This module offers separate power supply inputs for digital logic (connector pin 2) and driver/power stage

(connector pin 1). Both supply inputs use common ground connections (connector pin 3 and 4). This way,

power supply for the driver stage may be switched off while still maintaining position and status

information when keeping digital logic supply active. In case power supply is provided to the power section

only, an internal diode will distribute power to the logic section also. So, when separate power supplies are

not required it is possible to just use pin 1 and 4 for powering the module.

A 4-pin JST B04P-VL connector is used for power supply.

Mating connector housing: JST VHR-4N

Mating connector crimp contacts: JST SVF-61T-P2.0

Label

Description

Driver

Module + driver stage power supply input

(nom. +48V DC)

Logic

(Optional) separate digital logic power supply input

(nom. +48V DC)

GND

Module ground (power supply and signal ground)

GND

Module ground (power supply and signal ground)

Table 4.2: Connector for power supply

Please note, that there is no protection against reverse polarity or voltages above the upper maximum

limit. The power supply typically should be within a range of 24 to 48V.

When using supply voltages near the upper limit, a regulated power supply is mandatory. Please ensure,

that enough power filtering capacitors are available in the system (2200µF or more recommended) in order

to absorb mechanical energy fed back by the motor in stalling conditions. In larger systems a zener diode

circuitry might be required in order to limit the maximum voltage when the motor is operated at high

velocities.

The power supply should be designed in a way, that it supplies the nominal motor voltage at the desired

maximum motor power. In no case shall the supply value exceed the upper voltage limit.

To ensure reliable operation of the unit, the power supply has to have a sufficient output capacitor and the

supply cables should have a low resistance, so that the chopper operation does not lead to an increased

power supply ripple directly at the unit. Power supply ripple due to the chopper operation should be kept at

a maximum of a few 100mV.

Guidelines for power supply:

 keep power supply cables as short as possible

 use large diameters for power supply cables

 add 2200µF or larger filter capacitors near the motor driver unit especially if the distance to the

power supply is large (i.e. more than 2-3m)