B-116 Load Cell Check Out Box - Vulcan | On

B-116 Load Cell Check Out Box - Vulcan | On
B-116
TECHNICAL BULLETIN
1-800-237-0022
Page 1 of 4
LOAD CELL CHECK OUT BOX
PART NO. 56-10425-001
CONCEPT:
The Vulcan Check Out Box was designed to aid in troubleshooting Vulcan electronics and
Vulcan load cells.
FIG. 116-A
CHECKING LOAD CELL ELECTRICAL ISOLATION AND RESISTANCE (See FIG. 116-B):
The electrical isolation test detects the presence of moisture that could lead to erratic readings.
Do not touch the probes with your hands when making this measurement. This could cause
an error in the meter readings. Disconnect all Vulcoder leads from the load cells of the
channel being tested. Check the inside of the load cell connector with a dry cotton swab to
make sure it is clean and dry. If not, clean with isopropyl alcohol and dry with a hair dryer.
Plug the cabled connector from the Check Out Box into the load cell. Electrical Isolation can
be checked using a digital multimeter with a conductivity scale. Place a probe on one of the
colored pin’s metal surfaces and the other probe on an unpainted clean surface on the load
cell body. Electrical Isolation must not exceed 2.0 nS or be below 500 Meg Ohms. Check all
four pins. If the load cell fails (electrical isolation is greater than 2.0 nS or is less than 500 Meg
Ohms), clean the inside of the load cells with a dry cotton swab to make sure it is clean and
dry. If not, clean with isopropyl alcohol, dry with a hair dryer, and check the electrical
Stress-Tek, Inc. USA,
5920 S. 194th Street, Kent, WA 98032
253-872-1910 FAX: 253-872-9626
Rev. G
Stress-Tek, Inc. Canada, 11-1642 Langan Avenue, Pt. Coquitlam, BC V3C 1K5 604-944-1481 FAX: 604-944-1482
B-116
TECHNICAL BULLETIN
1-800-237-0022
Page 2 of 4
isolation again. If the load cell cannot be brought to Vulcan specifications, contact your Vulcan
dealer.
If electrical isolation readings are within specification, access the colored pins to check bridge
resistance. If the bridge resistance is not within the following specifications, contact your
Vulcan dealer.
OR
FIG. 116-B
VULCAN LOAD CELL RESISTANCE SPECIFICATIONS:
red to black
white to green
green to red must be the same as green to black
white to red must be the same as white to black
Note: For Center Hanger load cells, red to black
349-400 Ohms
349-352 Ohms
within 1 Ohm
within 1 Ohm
349-450 Ohms
CHECKING A VULCAN V200 ELECTRICAL SYSTEM
Before using the Check Out Box make sure the meter fuses are good. Use a multimeter to
ensure there is a minimum of 12.3 Vdc at the back of the meter. If there are any error
messages displayed, use the troubleshooting section of the “Vulcan V200 Operation and
Maintenance Manual” or the “V200 Service Manual” to identify the problem.
Stress-Tek, Inc. USA,
5920 S. 194th Street, Kent, WA 98032
253-872-1910 FAX: 253-872-9626
Rev. G
Stress-Tek, Inc. Canada, 11-1642 Langan Avenue, Pt. Coquitlam, BC V3C 1K5 604-944-1481 FAX: 604-944-1482
B-116
TECHNICAL BULLETIN
1-800-237-0022
Page 3 of 4
V200 VULCODER CHECK OUT PROCEDURE:
Using the Cycle button, lock the meter on the channel that the Vulcoder will be tested on,
either Channel A or B. Set the Calibration Number to 2050 on the channel being tested for
1 mV/V Vulcoder (set to 4100, for 2 mV/V Vulcoder, and set to 6150, for a 3 mV/V Vulcoder).
Set the Tare Reference Number for that channel to zero using the following procedure.
Disconnect all load cells from Vulcoder on the channel being tested. While depressing the
Tare button, use the Up or Down Arrow buttons to make the display read zero. The display
must read zero while the Tare button is depressed. Release the Tare button.
With all load cells disconnected on the channel being tested, plug a Vulcoder lead into the
Check Out Box (load switch “OFF”). The meter display must read zero (+/- 200 lb). If the
displayed number is not zero, the Tare reference number is not zeroed or the cabling is
damaged. Move the load switch to “ON” indicted by the red dot. The V200 meter must display
38,200 (+/- 200) and it must return to zero (+/- 200) when the load switch is turned “OFF”.
Check all leads. If any Vulcoder lead does not perform as stated above, the black Vulcoder
cable is damaged and must be inspected and repaired. If all Vulcoder leads do not perform as
stated above, all have been damaged or the Vulcoder needs to be replaced. Contact your
Vulcan dealer for repair or replacement of damaged Vulcoder or Vulcoder lead.
V200 LOAD CELL TARE TEST
Clean all load cell connectors. Set the calibration number for Vulcoder type as stated above.
Re-connect each load cell to the Vulcoder one at a time. There must be only one load cell
connected at any one time. The meter will display the load cell Preload Number. The Preload
Number must fall between +12,000 to -12,000 lb. If the Preload Number exceeds +12,000 to 12,000 lb, proceed with steps 1 through 5.
1. Clean the load cell connector and cable connector with cotton swabs and isopropyl
alcohol.
2. Dry thoroughly with a hair dryer. DO NOT OVERHEAT.
3. Check the Preload Number again to see if it is within the +12,000 lb to - 12,000 lb
range. If the load cell is still out of range, it may be faulty. If the load cell cannot be
brought to Vulcan specifications, contact your Vulcan dealer.
4. Measure the Preload Number of the remaining load cells one at a time.
5. Replace the O-rings inside Vulcoder connectors before re-connecting.
Stress-Tek, Inc. USA,
5920 S. 194th Street, Kent, WA 98032
253-872-1910 FAX: 253-872-9626
Rev. G
Stress-Tek, Inc. Canada, 11-1642 Langan Avenue, Pt. Coquitlam, BC V3C 1K5 604-944-1481 FAX: 604-944-1482
B-116
TECHNICAL BULLETIN
1-800-237-0022
Page 4 of 4
CHECKING A VULCAN V400 ELECTRICAL SYSTEM
Before using the check out box make sure the meter fuses are good. Use a multimeter to
ensure there is a minimum of 11 Vdc at the back of the meter. If there are any error messages
displayed, use the troubleshooting section of the “Vulcan V400 Operation and Maintenance
Manual” or “V400 Service Maintenance Manual” to identify the problem.
V400 VULCODER CHECK OUT PROCEDURE:
Using the cycle button, lock the meter on the channel (A or B) that the Vulcoder will be tested
on. Set the Calibration Number to 2050. Set the Tare Reference number for that channel to
zero using the following procedure. Disconnect all load cells from the Vulcoder on the channel
being tested. While depressing the Tare button, use the Up and Down Arrow buttons to make
the display read zero. Release the Tare button.
With all load cells disconnected on the channel being tested, plug a Vulcoder lead into the
Check Out Box (load switch “OFF”). The meter display must read zero (+/- 200). If it does not,
the Tare reference number is not zeroed or the cabling is damaged. Move the load switch to
“ON”, indicated by the red dot. The meter must display 33,200 (+/- 200) and it must return to
zero (+/- 200) when the load switch is turned “OFF”. Check all leads. If any Vulcoder lead
does not perform as stated above, the black Vulcoder cable is damaged and must be
inspected and repaired. If all the Vulcoder leads do not perform as stated above, all have
been damaged or the Vulcoder needs to be replaced. Contact your Vulcan dealer for repair or
replacement of damaged Vulcoder or Vulcoder lead.
V400 LOAD CELL TARE TEST
Clean all load cell connectors. Set the calibration number for Vulcoder type as stated above.
Re-connect each load cell to the Vulcoder one at a time. There must be only one load cell
connected at any one time. The meter will display the load cell Preload Number. The Preload
Number must fall between +17,000 to -12,000 lb. If the Preload Number exceeds +17,000 to 12,000 lb, proceed with steps 1 through 5.
1. Clean the load cell connector and cable connector with cotton swabs and isopropyl
alcohol.
2. Dry thoroughly with a hair dryer. DO NOT OVERHEAT.
3. Check the Preload Number again to see if it is within the +17,000 lb to - 12,000 lb
range. If the load cell is still out of range, it may be faulty. If the load cell cannot be
brought to Vulcan specifications, contact your Vulcan dealer.
4. Measure the Preload Number of the remaining load cells one at a time.
5. Replace the O-rings inside Vulcoder connectors before re-connecting.
Stress-Tek, Inc. USA,
5920 S. 194th Street, Kent, WA 98032
253-872-1910 FAX: 253-872-9626
Rev. G
Stress-Tek, Inc. Canada, 11-1642 Langan Avenue, Pt. Coquitlam, BC V3C 1K5 604-944-1481 FAX: 604-944-1482
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