AMS DCB-274 Power Supply and Motor Connection J5, Step and Direction Inputs J1, Encoder Inputs J1

ADVANCED MICRO SYSTEMS, INC. HARDWARE

Step and Direction Inputs (J1)

A 10k pull-up resistor allows open-collector circuits to be used. The inputs will withstand in excess of 24 volts.

Pin Signal

6Ground, common with the power supply input

11Step pulse input

12Direction input

The recommended step input is a negative going pulse 5 volt TTL or CMOS.

Encoder Inputs (J1)

Optional encoder circuitry can be specified with the DCB-274-E option. With this option the step input pins 11 and 12 change to industry standard quadrature A and B inputs. The quadrature clocks derived from optical or magnetic encoders, when applied to the A and B inputs are converted to step and direction signals. The number of steps per encoder revolution is equal to four times the number of “slots” on the encoder. The motor will directly follow any changes in the encoder position.

Note: If the encoder produces steps too fast, the step motor can stall if it is physically unable to follow the abrupt changes in rate and/or direction.

A 10k pull-up resistor allows open-collector circuits to be used. The inputs will withstand in excess of 24 volts.

Pin Signal

6Ground, common with the power supply input

75 volts. Can be used to power an encoder with low current requirements.

11Encoder Phase A

12Encoder Phase B

Power Supply and Motor Connection (J5)

Connector J5 provides the power supply input and motor phase drive outputs. The recommended power supply is an unregulated DC design with voltage and current ratings, appropriate for the driver. The on- board 5-volt is for logic power.

For maximum motor speed performance the motor should have a low voltage (higher current, low inductance) and the power supply voltage as high as possible NEVER exceeding the DCB-274 input ratings.

Pin	Signal	Type
1	Gnd	Ground
2	VMM	+24 to 40Vdc
3	PH-3	Phase 2-B
4	PH-2	Phase 2-A
5	PH-1	Phase 1-B
6	PH-0	Phase 1-A

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