Warner Electric CBC-1000 - Manual (Page 10)

8 Warner Electric • 800-825-9050 P-275 • 819-0496
Mode Of Operation (Program Line 8)
The CBC-1000 is programmable to operate in either the absolute or incremental mode of operation.
Absolute mode is used in systems that tend to accumulate error. A common example is an indexing
conveyor or table. When used in this mode, the CBC-1000 maintains its position in an absolute sense and
compensates for any slight errors made on the prior move.
The incremental mode of operation is used for systems that will not accumulate error, such as a cut to length
paper sheeter or an auger filler. In such systems, each consecutive move is independent of the previous one.
In the incremental mode a reset signal to terminal 12 is required from one of the zero speed outputs or an
external source (Ref. page 18 for wiring diagram). The key to mode selection is programming line 8, Auto
Reset (on/off):
Absolute mode of operation - Auto Reset “On”
Incremental mode of operation - Auto Reset “Off”
Display Scaling (Program Line 3)
• Changing the CC & decimal point will affect presets
• CC should not exceed 1.0
• CC of .5 displays encoder pulses
The display can be easily scaled to display engineering units (inches, meters, degrees, rotations, etc). Line 3
of the programming (correction constant) prompts input of a factor (five decades) that will be multiplied by
the incoming pulse train to display the desired engineering units. Remember that the CBC-1000 includes a
times 2 internal multiplier effectively doubling the resolution of a given encoder. Thus, if one wishes to view
encoder pulses, a multiplier (correction constant) of ‘0.5’ should be entered on Line 3 in the programming
mode. The resolution of the encoder should be chosen to take advantage of the best instantaneous
accuracy of the calibrator. The best instantaneous accuracy is obtained with a correction constant setting not
exceeding 1.0000. The scaled units are also used to measure stop and move distances. Consequently, the
scaled units selected affect the system resolution. For example, with the correction constant set the display
at 1.0 inches, this is the smallest measurable increment. Remember, the decimal point must be programmed
(programming line 4) to display the desired display resolution. This resolution is also used in the denominator
of the correction constant equation. The general form of the equation for the correction constant is given
below.
CC (Correction Constant) = Distance traveled in engineering units per one revolution of the encoder
Display Resolution Desired X Encoder Resolution X 2
(0.001, 0.01, 1.0)
Example: Web measurement - Display in inches, display resolution in tenths of an inch
Encoder Resolution - 600 PPR
Mounting - Direct, via 4” diameter wheel
Calculation:
cc =
π0 = π x 4 = 12.5664
= 0.1047
0.1 X 600 pulses/revolution X 2