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Curtis 1222 Manual, os 15
2 9 J A N U A R Y 2 0 1 3 D R A F T
2 — INSTALLATION & WIRING: I/O Signal Specifications
Encoder inputs
These inputs are used when the steer command and position feedback devices
are encoders. Command Encoders 1 and 2 are for steer commands, and Steer
Motor Encoders 3 and 4 are for feedback.
Pairs (A, B) of control lines are internally configured to read quadrature
type encoders. The encoders are typically powered from the 5V supply (pin 21),
but can be powered from any external supply (from 5V up to B+) as long as
the logic threshold requirements are met.
Note: Steer Motor Encoder 3 is always required, even when redun
-
dant analog feedback inputs are used (feedback pots or sine/cosine sensors
or sawtooth sensors). Encoder 3 must be directly connected to the motor shaft
as it is used for motor control; it must have a minimum of 32 ppr. Encoder 4,
if it is used, can be connected to either the motor shaft or the steered wheel; if
it is connected to the steered wheel, it should have a minimum resolution of
0.5 counts/degree (equivalent to 45 ppr).
ENCODER INPUT SPECIFICATIONS
LOGIC
INPUT MAX PROTECTED ESD
SIGNAL NAME PIN THRESHOLDS
IMPEDANCE FREQ. VOLTAGE TOLERANCE
Command Encoder 1A 14 Rising edge= 1 kΩ 2 kHz 65 V ± 8 kV (air
Command Encoder 1B 25 4 V max discharge)
Falling edge=
1 V min
Command Encoder 2A 33
Command Encoder 2B 20
Steer Motor Encoder 3A 31 10 kHz
Steer Motor Encoder 3B 32
Steer Motor Encoder 4A 26
Steer Motor Encoder 4B 27
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