Cleveland Motion Controls Classic UPB Transducer Load Cell REV BA - Manual (Page 7)

INSTRUCTION NUMBER: AO-70136 BA
7of 9
not weigh more than ½ the maximum working
force of the transducers in most cases.
Or
The surface under the UPB is not flat enough.
Or
The bolting torque is not in accordance with
Figure 5 (especially for UPB with MWF under
250 lb.).
6.2 LOW OUTPUT SIGNAL
The transducer may have too large a maximum
working force for the application. Replace with a
lower maximum working force transducer or
increase web wrap angle.
6.3 WRONG POLARITY OF OUTPUT
SIGNAL
Transducers may have been incorrectly oriented.
See Section 2.4 for proper load direction.
Alternately, change the transducer excitation
voltage by interchanging the B and C connections.
6.4 OUTPUT SIGNAL NOT LINEAR,
ZERO SHIFTS DURING
OPERATION
Check transducer and tension roll mounting. All
mounting bolts must be tight. Check that there is
no dirt or foreign matter interfering with the
transducer mounting. Check that mounting surface
is flat and rigid.
6.5 NO OUTPUT SIGNAL
Check to see that all connections have been made
completely. Check for places where the
connecting cables might be crimped or cut.
6.6 VERY HIGH OUTPUT WITH NO
LOAD
Check cables and connectors for good connections
and check continuity of cables with an ohmmeter.
Check for proper wiring to transducers. Check
transducer gage resistance as given in the
following chart at room temperature with no load
applied.
TRANSDUCER GAGE RESISTANCE CHECK
Resistance
(ohms)
UPB 1 UPB 2/3
Pin C to B 420±20 420±20
Pin A to B 210±10 900-1100
Pin A to C 210±10 900-1100
7.0 SERVICE ASSISTANCE AND
REPAIR
For additional service assistance, please obtain the
Type, MWF, and Serial Number from the
nameplate. Contact the Factory Service
Department.
Phone: 216-524-8800
Or 800-321-8072
Fax: 216-642-2100
Visit Us: www.cmccontrols.com
Disassembly by improperly trained personnel may
result in additional damage to these units. Should
repairs be required or for warranty repairs, contact
the Customer Service Department for a return
authorization number before returning the units.