Cleveland Motion Controls Classic Tension Transducers SC-EP REV GA - Manual (Page 4)

A800-7438 Rev GA Cleveland-Kidder Transducers; EC, ECM, SC, SCM & SC-EP
Page 4 of 10
1 GENERAL INFORMATION
1.1 RECEIVING AND UNPACKING
Handle and unpack the equipment carefully.
Immediately upon arrival, check the shipment
against the packing list. Any damage should be
reported immediately to the carrier and to the
nearest CMC representative.
Equipment which will not be installed
immediately should be stored in a clean, dry
location. Precautions should be taken to prevent
moisture, dust and dirt from accumulating in
storage and installation areas
1.2 PRECAUTIONS
1.2.1 S HIPPING
It is recommended that the sensing roll be
removed when the machine is shipped with the
transducers mounted. The shock and vibration
transmitted to the transducers by the sensing roll
during transporting can damage them.
1.2.2 R OLL B ALANCE
The sensing roll must be dynamically balanced
when the roll speed is 300 RPM or greater. The
sensing roll must not be driven or have any force
applied to it other than by the web. Excessive
vibrations can damage the transducers.
1.2.3 C RITICAL R OLL S PEED
Even with a balanced roll, a vibration can be set
up in a stationary shaft. If this vibration (in cycles
per minute) occurs at the harmonic frequency of
the shaft, the transducers can be damaged. To
determine the critical roll speed, use the following
formula: (all dimensions are in inches)
Critical roll = 4.8 x 106 x Shaft O.D.
speed in RPM (Shaft Length) 2
To assure that this problem is avoided, the critical
roll speed should at least be 20% above the roll
speed attained at maximum web speed.
1.2.4 O VERLOADING
Repetitive overloading above the maximum
working force or severe overloading should be
avoided because it will damage the transducers.
1.3 SPECIFICATIONS
Gage Resistance -120 ohms per leg
240 ohms, EP versions
Gage Factor -100 nominal
Excitation Voltage -5.6 VDC or VRMS max
for non-EP versions,
10 VDC or VRMS max
for EP versions
Output Signal
at Rated MWF
-250 mV nominal per
Transducer (1/2 bridge)
500 mV nominal per
Transducer (EP versions)
500 mV nominal per
Transducer pair
(full bridge)
Output Impedance -Approximately 850 ohms
(910 ohms, EP versions)
per Transducer (1/2
bridge) or 1700 ohms
(1820 ohms, EP versions)
per pair (full bridge) at
25
○ C
Required Input
Impedance of
Tension Amplifier
-5K ohms per Transducer
(1/2 bridge)
10K ohms per pair
(full bridge)
Maximum Voltage,
Gage to Beam or
Base (Ground)
-50 VDC
Operating
Temperature Range -0
○ F to +200 ○ F