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Encoder Conditioning Unit
1.1. Interface Features
1.1.1. Self-Tuning Active Correction
The ECU interface actively corrects for input signal imperfections to optimize system accuracy. Corrections
are made for the following:
Automatic Offset Control (AOC)
Automatic Gain Control (AGC)
Automatic Balance Control (ABC)
These correction mechanisms operate over the full working speed range of the readhead. The user can
disable/enable the AGC by pressing the calibrate button for greater than 3 seconds.
1.1.2. LED Indicators
The tri-colored SETUP LED provides visual feedback of signal strength and error condition for setup and
diagnostic use. It flashes Off momentarily to indicate a reference mark, up to 100 mm/s only
Table 1-1:
Setup LED
Color
State
FLASHING
Purple
ON
FLASHING
Blue
ON
Green
ON
Orange
ON
ON
Red
FLASHING
The Yellow CAL/AGC LED indicates when the ECU is in a calibration routine and whether or not AGC is
active
Table 1-2:
CAL/AGC LED
Color
Yellow
6
adjusts offset independently for the sine and cosine signals
ensures consistent 1 Vpp signal amplitude
adjusts the gain to equalize the sine and cosine signals
Indication
High Signal Alarm Condition
High Signal
Over Speed Alarm Condition
Optimum Signal
Acceptable Signal
Low Signal
Unacceptable Signal
Unacceptable Signal Alarm Condition
State
Indication
ON
AGC active
OFF
AGC inactive
SLOW FLASH
calibration routine
FAST FLASH
calibration failure
ECU Hardware Manual
%
>135%
>110% and <135%
>90% and <110%
>70% and <90%
>50% and <70%
>20% and <50%
<20%
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