MMP SA-2550A
Page 5 of 24
Midwest Motion Products
DESIGN, MANUFACTURING & DISTRIBUTION - MOTION CONTROL EQUIPMENT
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PIN FUNCTIONS
P1 - Signal Connector
Pin
Name
Description / Notes
I/O
1
+10V 3mA OUT
±10 V @ 3 mA low power supply for customer use. Short circuit protected. Reference ground
common with signal ground.
O
2
SIGNAL GND
GND
3
-10V 3mA OUT
O
4
+REF IN
Differential Reference Input (±10 V Operating Range, ±15 V Maximum Input)
I
5
-REF IN
I
6
-TACH IN
Negative Tachometer Input (Maximum ±60 V). Use signal ground for positive input.
I
7
VEL MONITOR OUT
Velocity Monitor. Analog output proportional to motor speed. In Encoder Velocity mode, output is
proportional to the encoder line frequency. Encoder Velocity scaling is 22 kHz/V. In Hall Velocity mode,
output is proportional to the Hall frequency. Hall Velocity scaling is 100 Hz/V.
O
8
CURR MONITOR OUT
Current Monitor. Analog output signal proportional to the actual current output. Scaling is 8.05 A/V by
default but may be reduced by half this value by setting DIP switch SW1-3 to OFF (see Hardware
Setting section below). Measure relative to power ground.
O
9
INHIBIT / ENABLE
TTL level (+5 V) inhibit/enable input. Pull to ground to inhibit drive (SW1-2 ON). Pull to ground
to enable drive (SW1-2 OFF). Inhibit turns off all power devices.
I
10
+V HALL 30mA OUT
Low Power Supply For Hall Sensors (+6 V @ 30 mA). Referenced to signal ground. Short circuit
protected.
O
11
GND
Signal Ground
GND
12
HALL 1
Single-ended Hall/Commutation Sensor Inputs (+5 V logic level). Leave open for brushed motors.
I
13
HALL 2
I
14
HALL 3
I
15
CURR REF OUT
Measures the command signal to the internal current-loop. This pin has a maximum output of
±
7.25 V when the drive outputs maximum peak current. Measure relative to power ground.
O
16
FAULT OUT
TTL level (+5 V) output becomes high when power devices are disabled due to at least one of the
following conditions: inhibit, invalid Hall state, output short circuit, over voltage, over temperature,
power-up reset.
O
P2 - Power Connector
Pin
Name
Description / Notes
I/O
1
A
Motor Phase A
O
2
B
Motor Phase B
O
3
C
Motor Phase C
O
4
POWER GND
Power Ground (Common With Signal Ground)
PGND
5
HIGH VOLTAGE
DC Power Input
I
P3
–
Feedback Connector
Pin
Name
Description / Notes
I/O
1
+5V
Low Power Supply for Encoder (+5V). Internally connected to P1-10. Total current available from P3-1
to P1-10 is 150 mA. Referenced to signal ground. Sort circuit protected.
O
2
CHANNEL A
Single-ended encoder channel A input. +5 V logic level.
I
3
NC
Not Connected (Reserved)
-
4
CHANNEL B
Single-ended encoder channel B input. +5 V logic level.
I
5
SIGNAL GND
Signal Ground
SGND
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