TROUBLESHOOTING
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CYGNUS
MI 850A316 1 B
Page 37 of 66
Problem
Possible Cause
Solution or Diagnostic
Process not running, but
Cygnus is in Auto mode.
When the process is not running the
tension control system is open loop. If
the tension is even slightly below
Setpoint, the Cygnus will turn full on
attempting to correct the tension.
Output always low
Tension ON/OFF set to OFF
If “Tension On/Off Mode is set to
“Toggle”, from “Home” press Tension
On/Off once.
If “Tension On/Off Mode is set to “Level”,
one or more of the external Tension
On/Off switches are active.
“Active” depends upon the Digital Input
Mode
E-Stop Active (All control
types except unwind)
For safety reasons E-Stop occurs with an
open circuit. The logic is therefore
different than the other digital inputs. E-
Stop can also be mistakenly activated by
selecting Digital Input Mode Active High
when it is wired active low (and the other
way around). If it is difficult to change the
Digital Input Mode to the correct position,
try switching to Manual mode on the
Home screen.
Process not running, but
Cygnus is in Auto mode.
When the process is not running the
tension control system is open loop. If
the tension is even slightly above
Setpoint, the Cygnus will turn full off
attempting to correct the tension.
Screen blank
Contrast grossly
misadjusted.
Remove power. Reapply power and wait
5 seconds to ensure that the Cygnus is
on the HOME screen. Hold the decimal
point key and the “Enter” key down for
more than 2 seconds.
The contrast will
start changing through its full range of
values. When the contrast is nearly
correct press any side key. Refine the
contrast using the keys marked with the
arrows.
Screen difficult to read
Contrast misadjusted
Navigate to Home>>More..>>Program>>
Calibrate>>Display and adjust contrast
Power select switch
improperly set.
Set 115/240 vac switch to the appropriate
position.
Suspect incorrect tension readings
or cannot calibrate load cells.
Incorrect load cell
connections.
Navigate to
Home>>More..>>Program>>
Calibrate>>Basic>>Diagnose Sensor
Summary of Contents for Cygnus MAGPOWR
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