Trouble shooting, Electrical – Warner Electric FM Series Foot Mounted Load Cells AC10 Measuring System A-B-C30 User Manual
Page 34
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Warner Electric • 800-825-9050
P-2012-3
Trouble Shooting
When properly installed in accordance with the
original design specifications Warner Electric
tensioncells should require little or no regular
maintenance or service.
Certain conditions, however, can impair their
inherently accurate and reliable performance.
Therefore, if trouble should arise, the following
conditions should be checked.
1. Has the tension measuring system been
changed?
a. An increase or decrease in strip tension.
b. An increase or decrease in the wrap
angle.
If the above parameters have been
changed enough to prevent the unit from
operating within the limits of the fixed
Mechanical Stop, restore parameters to
previous condition or consult factory.
2. Is the loadcell mounted securely?
3. Is tension measuring roll in proper alignment
and does it turn freely?
4. Are bearings and seals free of all binding
and stickiness? Are they worn?
3. Are LVDTs open or shorted?
To check, turn off power and disconnect the
input and output leads. Check coil continuity
and resistance. (Refer to Figure 10)
a
Pin A to Pin B (Primary Coil) should be in
excess of 2 megohms.
b. Pin A or Pin B to LVDT shell should be in
excess of 5 megohms.
c. Pin C to Pin D (Secondary Coil) should
be approximately 20,000 ohms.
d. Pin C or Pin D to LVDT shell should be in
excess of 5 megohms.
If LVDT circuits are open or shorted, replace
LVDT. Contact Warner Electric with tensioncell
model number and serial number.
Black - (2)
Red + (1)
Green (3)
Blue (4)
Input
Output
X Twisted Leads
A B
Oscillator
Demodulator
P1
S1
S2
X
X
When Supplied
with Cable
(1) Red + DC
(2) Black – DC
(3) Green – Signal
(4) White + Signal
C D
B
A
C
D
Electrical
1. Are LVDTs receiving correct input voltage?
Check line voltage, fuses or circuit breakers,
and power switches. Check power supply
output and voltage to LVDTs.
2. Are all connections secure?
Check for continuity. Retighten all connec-
tions. Recheck operation.
Figure 10