Pulsafeeder Pulsar DLC XP RC - Manual (Page 61)

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11.2 Encoder Diagnostics
Whenever the DLC is re-calibrated it first performs a Zero Calibration. The first portion of the
{CALIBRATING ZERO} routine is an encoder test. The DLC will increase the stroke adjustment 1%,
while monitoring the encoder output. It will then reverse direction and drive the mechanism to the 0%
position. During the 1% increase, the DLC reads the encoder output and compares it to the expected
value. If, at any time during this process the DLC detects an error it will display:
ENCODER ERROR ##
PRESS ENTER
A numerical value between 0 and 15 will display (instead of '##' in the example). Pressing and releasing
[UP] will increase the stroke setting one encoder pulse. A new value will display. The value should
increase by one count. Repeating the press and release [UP] step should cause the value to increase by
one count with each cycle until in the fashion: 0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-0-1-2-3-4, etc.
Like wise, pressing [DOWN] will reduce the value by one count.
ENCODER ERROR
Symptom Probable Cause Possible Solution
Numbers decrease
sequentially with
[UP] Control Wiring Incorrect - motor
control pairs swapped. Check wiring. Refer to section 5-
Installation:Control Connections.
Numbers are not
sequential Encoder Wiring Incorrect - encoder output
pairs swapped. Correct wiring. Refer to section 5-
Installation:Control Connections.
While the {ENCODER ERROR ##} screen is displaying you can access a further diagnostic by pressing
[UP] and [DOWN] simultaneously. This will cause a bit level diagnostic to display:
EXPECTED 1101
ACTUAL 1101
Again use individual [UP] and [DOWN] keystrokes to change the value. The bit positions are
associated with connector J17 on the DLC-RC and the J2 on the DLC-XP. If we consider the positions
of the value in the example above: position #1 = 1, position #2 = 1, position #3 = 0 and position #4 = 1.
These 'bit-positions' correlate to 'connector-positions' on J17 and J2:
Bit-Position Connector-Position
#1 (1XXX) J17-1 & J17-2 / J2-1 & J2-2
#2 (X1XX) J17-3 & J17-4 / J2-3 & J2-4
#3 (XX1X) J17-5 & J17-6 / J2-5 & J2-6
#4 (XXX1) J17-7 & J17-8 / J2-7 & J2-8
If while pressing [UP] or [DOWN] you notice two bit-positions in which the Expected is consistently
opposite from the Actual, then those positions are most likely reversed. If you notice that one are more
positions are not changing, then the connections have either not been made (i.e., open circuit) or have
been made incorrectly. Again return to 5-Installation:Control Connections.
Press [ENTER] to exit the diagnostic display. The DLC will then repeat the test. There is no way to
bypass the Encoder Test in the {CALIBRATING ZERO} process.
The encoder is field replaceable, contact your Pulsafeeder Representative for current part number and
pricing information if replacement is necessary.