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Calibration Procedure
Adjustment of the CPS-2 is necessary if the
signal range requires an increase or decrease in
value relative to the drive’s output shaft stroke.
Calibrate by turning the Span Potentiometer CW
to increase the gain of the CPS-2. This has the
effect of increasing the output at the high end and
lowering the output at the low end equally.
Signal Span is determined by the CPS-2
model and ranging resistor selected.
CAUTION
Do not adjust the zero potentiometer to shift
the span.
To adjust the span, turn the Span Potentiometer
on the CPS-2 circuit board. The Span
Potentiometer adjusts the CPS-2 so that the
drive output shaft motion produces the specified
output signal range.
Tools required for calibration:
mA / V dc Multimeter
3/32” Screwdriver
7/64” Hex Wrench
5/16” Open End Wrench
1/2” Combination Wrench
15/16” Combination Wrench
1/32” Thickness Feeler Gauge
200 ohm Resistor
1. Put electric Handswitch in STOP position.
2. Open the terminal block cover (1/2” bolt
heads) and top cover (15/16” bolt head). The
O-ring seal will remain in the rim of the top
cover when removed.
3. Determine the correct feedback terminals
from the wiring diagram supplied with your
drive (CC, DD, EE).
4. Install a mA meter in series with a 200 ohm
load resistor for current outputs or a voltmeter
across the CPS-2 output terminals for voltage
outputs (see Table 11, page 46).
5. Move the drive to the fully extended position
and record the signal voltage or current.
6. Move the drive to the fully retracted position
and record the signal voltage or current.
7. Subtract the two signal readings and compare
to the desired output signal span. For
example, 16 mA for 4–20 mA signal range.
Divide the difference between the measured
and desired span by 2. Adjust the Span
Potentiometer by this amount with the drive
at the 100% position. CW movement of the
Potentiometer increases the span equally at
CPS-2 Calibration
Model 14-_06 and 14-_08
These models are equipped with a Contactless
Position Sensor (CPS-2) for position sensing
and feedback. On model 14-_08, the CPS-2
also delivers a feedback signal to the Electronic
Signal Receiver (ESR-4). Adjusting the remote
feedback signal also automatically adjusts the
ESR-4 signal.
CPS-2 units are designed to provide position
feedback without contacting or wiping surfaces.
On option 8 units, the CPS-2 includes a Monitor /
Isolator board which detects high and low out-of-
limit conditions. The Monitor function monitors
the CPS-2 position signal and compares it to
established limits. If the output exceeds normal
signal conditions, the monitor relay contact
opens. This relay may be used for a remote
signal indication or activation of Loss-of-Signal
operation.
The CPS-2 provides infinite resolution by
means of a ferrite rotor on the control shaft and
a ferrite stator on the CPS-2 board. To make
feedback signal adjustments, adjust the span,
then change the position of the rotor on the
control shaft to adjust the zero.
Checking Feedback Signal
Calibration
To check CPS-2 calibration:
Tools required:
mA / V dc Multimeter
1/2” Combination Wrench
15/16” Combination Wrench
200 ohm Resistor
1. Put electric Handswitch in STOP position.
2. Open the terminal block cover (1/2” bolt
heads) and top cover (15/16” bolt head).
3. Determine the correct feedback terminals
from the wiring diagram supplied with your
drive (CC, DD, EE).
4. Install a mA meter in series with a 200 ohm
load resistor for current outputs, or a voltmeter
across the CPS-2 output terminals for voltage
outputs (see Table 11, page 46).
5. Drive the output shaft through its full range
and check the feedback signal.
When properly adjusted, the feedback signal
should be maximum with the drive’s output shaft in
the fully retracted (maximum input signal) position.
At 50% travel, the signal should be mid-span. At
full extension, the signal should be minimum. If not
correct, proceed with the calibration procedure.
Continued