4. Start Up Procedure
DO NOT DISTURB the zero and calibration settings previously made.
Ensure that the machine run relay is correctly wired, and that the start and stop time delays are correct if
needed. Firstly ensure that the main and slave drives are correctly set up and that they run at
equal web speed for equal speed signal inputs. THIS IS IMPORTANT. CMC will have pre-set the
controller, so that 10.00 v speed input = 10.00 v speed output with no trim signal. This is to make
life easier for the client.
Then run the machine, and measure the input voltage to the controller in the range of 0/+10.00 = 0/100%
line speed. (Terminal LS) With the “RUN RELAY” contact disabled (open circuit), measure the
slave drive output on terminal AO1, and ensure that it is exactly equal to the incoming main line
speed signal. Any changes can be done by changing the “speed gain” value in the controller
settings. As a double check, ensure that the web speeds are exactly matched using a hand held
tachometer.
By closing the run relay contact then the actual web tension is compared internally with the set web
tension, and the output value trimmed by small amount ( +/- 1.0v) to achieve these values to be
equal. NOTE. With no web in the machine, a maximum speed difference will be seen. When the
web is in the machine, and assuming no web slip, then the web speed differences will be very
small. It will only be the amount of stretch of the web to achieve the tension value. In practice this
is usually immeasurable small with a hand held tachometer. It can usually be measured as a
signal error on the output.
Once the web is in the machine, and then set a low value of tension, say 25%, and follow the steps
below….
1. The initial suggested settings for internal gain and compensation have been preset by CMC for a slow
and stable response, and should be sufficient to begin tests, these are: -
Prop. (Proportional) 0005 Int. (Integral) 0005 Diff. (Differential) 0000
Depending on where the run relay contact is derived from, the start delay and stop delay times may
need to be set for optimum results. Initially CMC suggest that they start at 00 (milliseconds). This
is a typical setting when the main drive zero speed relay contact is used. Other machine run
contacts may need a different setting (e.g. from the start/stop push buttons)
2. Set the machine into run mode
3. With the set tension value at 25%, run the machine slowly. (Say 10% max. line speed). Slowly
increase the set tension to 50% until a desired tension is shown on the tension meter. This should
be relatively stable, and slowly respond to small set point value changes. To improve the
response it is necessary to change the “P” and “I” values, and watch the response of the system.
Press the ESC & ENT buttons rapidly in sequence: - ESC - ENT - ESC - ENT - ESC. This must be done
within 2 seconds The screen should show “display” Scroll Down The screen should show
“inputs” Scroll Down
