Warner Electric MCS-208 - Manual (Page 25)

Warner Electric • 800-825-9050 P-276 • 819-9045 25
TRoUBLeSHooTING
Applies to the Remote/Analog Control System
With the exception of the dancer input, general MCS-166/MCS-208 system troubleshooting is quite
similar to troubleshooting the MCS-166/MCS-207. The chart below will be helpful in isolating problem
causes.
Probable Cause Suggested Solution
No DC power to the control. • Check for power LED illumination on MCS-208.
• Check for power LED illumination on MC-166.
• Check fuses.
• Check proper DC input connections to control (refer to tension
control hookup instructions).
• Check AC power input to MCS-166, if used.
Brake is not engaging. • Check to be sure lead wires to the transducer are connected to
terminals 1 and 2 of the control.
• Check to see that control input is properly connected.
• Using a voltmeter, check for output to the transducer. If the
output is in the range of the transducer, recalibrate the transducer
per the calibration procedure. If the transducer cannot be
calibrated, replace the transducer. If the output is not within the
range of the transducer, recalibrate the control. If the control
cannot be calibrated, replace the printed circuit board assembly.
• Check for proper input signal.
• Check to see that the transducer is wired properly.
• Check to see that brake-off input is not activated.
Brake does not have the torque capacity • Verify that the correct brake was selected by repeating the
required for the application. selection procedure.
Brake is not releasing as input level decreases. • Check the mechanical pars of the brake to insure that they are in
good operation condition and properly installed. Check to see if
brake-on input is activated.
Roll shaft not free to rotate with control off. • Brake and shaft must be free to rotate with control off.
Inputs incorrectly connected to control terminals. • Verify input connections.
If brake LED is off. • Using a voltmeter, check the output at the transducer as follows.
Slowly reduce the input level and observe that the output
decreases, then slowly increase the input level and observe that
the output increases.
Drag torque of the unwind stand exceeds the • With input level at minimum setting, check that the transducer
minimum torque allowable for the application. input decreases to the low end of the range. If not, the control
(This problem may occur near roll core.) output must be recalibrated. If the transducer input is correct,
verify that the brake pressure goes to zero. (The actuators should
be loose.) If the actuators are not loose, but become loose after
the supply pressure is removed, then recalibrate the transducer. If
the actuators are still tight, check to be sure that the brake is in
good operation condition and properly installed. If everything
checks as correct, check to be sure the unwind stand friction is not
excessive for the application. The inertia of the rotating parts may
also be causing excess tension as the unwind shaft accelerates
when unwind diameter decreases.