Installation manual

15
Operational Overview
installation techniques are followed, the differential input setup will provide a more robust and noise immune system than
a single ended input setup.
Differential input is recommended under any of the following conditions:
• Pulse width < 2 µs
• Pulse frequency > 250 kHz
• Pulse command cable length > 25 feet
• Noisy electrical environments
Differential input circuit specifications:
Single ended input circuit specifications:
Output driver requirements:
• 15 mA sinking (open collector)
• 5 Volt capacity
• Signal common connected to Drive Logic 0V (Sync Encoder Common 0V)
Input frequency maximum (f max): 1 Mhz (4 million counts per second quadrature)
Input device: AM26C32 - RS-485 receiver
Input impedance: 12 Kohms
Maximum voltage applied to input pins (A, A/) or (B, B/):
Single Ended (referenced to 0V drive logic):+12/-7 V
NOTE: As long as each is in single ended range, differential is O.K.
Maximum common mode voltage: +/-7 V
Minimum differential voltage required: 200 mV
Input voltage hysteresis: 60 mV
STI-SNCI Terminal
Sync Input Connector (J10)
Pin #
Pulse-Direction
Signal
Pulse-Pulse
Signal
Pulse Quadrature
Signal
11PulsePulse +A
2 2 Pulse/ Pulse +/ A/
3 3 Direction Pulse - B
5 5 Direction/ Pulse -/ B/
Input frequency maximum (f max): 500 khz (2 million counts per second quadrature)
Input electrical description: Internal 390 ohms pull-up to 5 Volt 9non-isolated)
Input Low Voltage (Vil): 1.5 Volt max.
Input high Voltage (Vhl): 3.5 Volt min.
Output driver requirements:
15 mA sinking (open collector) min at 0.4V max
Can drive to 5.5 V max. (will work with TTL or 5V CMOS outputs)
STI-SNCOA Terminal Analog/Sync Output Connector (J5) Pin #
Pulse-Direction
Signal
Pulse-Pulse
Signal
Pulse Quadrature
Signal
4 4 Pulse / Pulse CW / A
12 12 Direction Pulse CCW / B
Pulse /: Commands motion on the falling edge (active edge).
Direction: Positive (+) motion when high (inactive) and Negative (-) motion when low (active).
Pulse CW /: Commands positive (+) motion on the falling edge (active edge) of a pulse.
Pulse CCW /: Commands negative (-) motion on the falling edge (active edge) of a pulse.
A and B: Encoder Quadrature signal interpretation. When B leads A Positive (+) motion commands will
be generated, When A leads B, negative (-) motion commands will be generated.