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L17401-CL06JEN-E2-S02, REV. C INTRODUCTION TO TROUBLESHOOTING
Copyright © 2019 Amatrol, Inc.

S02-8

SKILL 2 TEST A MANUAL SWITCH



8. Now test the N.C. contacts of PB2. Use the same out-of-circuit test procedure

as you did in step 6. Record your results.

PB2 Resistance (not pressed) ______________________________ (Ohms)

PB2 Resistance (pressed) _________________________________ (Ohms)

Component Status ___________________________________ (Good/Bad)



The resistance should be zero in both conditions. This indicates that the

switch is bad.

NOTE

It is necessary to test the switch when actuated and not actuated. If you just

checked this contact in the unactuated state, you might assume in error that the
contacts are good.



9. Click the

Clear Fault

button to clear the fault or remove the fault plug and

replace it with the standard jumper plug.



The fault will clear and the fault status fi eld should change to “Fault 8 is

cleared.”



10. Repeat step 8 again to test the contacts.

PB2 Resistance (not pressed) ______________________________ (Ohms)

PB2 Resistance (pressed) _________________________________ (Ohms)

Component Status ___________________________________ (Good/Bad)



You should fi nd that the contacts are now operating normally again.



So far, you have faulted N.C. contacts to the shorted condition only. It is

important to note that these contacts can also fail in the open condition. In a
similar manner, N.O. contacts can fail either open or closed. In the next steps
in this skill, you test these conditions.



11. Use your new skills to test the N.C. contacts of PB3 using the out-of-circuit

test procedures. Record your results.

PB3 Resistance (not pressed) ______________________________ (Ohms)

PB3 Resistance (pressed) _________________________________ (Ohms)

Component Status ___________________________________ (Good/Bad)



The contact should be good. This means the resistance should be zero when

not pressed and infi nite when pressed.

Содержание 890-FTS1

Страница 1: ...al fault insertion skip to step 3 2 Perform the following substeps to set up the 890 FTS1 Troubleshooting System with a power cord A Make sure the troubleshooting system is plugged into a wall outlet B Make sure the troubleshooting system is turned off C Locate the fault terminals at the rear of the Operator Station on the 85 MT5 trainer D Make sure that the fault cables are connected to the 85 MT...

Страница 2: ...fault terminals on the operator station has a standard jumper plug inserted 4 Perform the following substeps to test the N O contacts of pushbutton PB1 in an out of circuit test A Locate your multimeter and set it to measure resistance B Make sure that no leads are connected to the plug in jacks on the front panel of the Operator Station If there are disconnect them 890 FTS1 TROUBLESHOOTING SYSTEM...

Страница 3: ...s shown in figure 2 2 and record the measurement PB1 Resistance not pressed ____________________________ Ohms If the pushbutton is good the resistance should be infinite open This is the first step of testing the pushbutton The next step is to test it when the operator is pressed Figure 2 2 Pushbutton PB1 N O Contacts Out of Circuit Test COM Ω Ω OPERATOR STATION PN 17320 EARTH GND SS1 PB3 PB2 PB1 ...

Страница 4: ...meter leads on the pushbutton s N O contact block as shown in figure 2 3 NOTE The contact blocks for the pushbutton switches and the selector switch simply snap into place This makes them easy to replace when necessary Figure 2 3 Actual Measurement of Contacts 5 Perform the following substeps to insert a fault into PB1 in the single fault mode and test it A If you are using manual fault insertion ...

Страница 5: ...____________ Ohms Component Status _________________________________ Good Bad This time you should find that the multimeter measures zero resistance in both conditions This means that there is a short in the contacts The component is bad K Click the Clear Fault button to clear the fault or remove the fault plug With the FaultPro software the fault will clear and the fault status field should chang...

Страница 6: ... bad Q Click the Clear Fault button to clear the fault or remove the fault plug With the FaultPro software the fault will clear and the fault status field should change to Fault 7 is cleared If you are using manual fault insertion remove the open plug from terminal 7 and replace it with the standard jumper plug 6 Now test the N C contacts of PB2 Use the same out of circuit test procedure as in ste...

Страница 7: ...tacts 7 If you are using manual fault insertion obtain a short fault plug and plug it into the station fault terminal labeled 8 in place of the standard jumper plug If you are using the FaultPro software type 8 in the Enter Fault field and press the Enter key or click to activate the fault Fault 8 is now active This will cause a short in the N C contacts of PB2 This condition can occur if the cont...

Страница 8: ...d the fault status field should change to Fault 8 is cleared 10 Repeat step 8 again to test the contacts PB2 Resistance not pressed ______________________________ Ohms PB2 Resistance pressed _________________________________ Ohms Component Status ___________________________________ Good Bad You should find that the contacts are now operating normally again So far you have faulted N C contacts to t...

Страница 9: ...____________________ Ohms Component Status ___________________________________ Good Bad You should find that the contacts are now bad because the resistance reads infinite in both conditions 14 Click the Clear Fault button to clear the fault or remove the fault plug and replace it with the standard jumper plug The fault will clear and the fault status field should change to Fault 9 is cleared 15 N...

Страница 10: ...sition the upper contacts of this switch should be open B Place the multimeter leads into the terminals of the upper contacts of SS1 as shown in figure 2 6 and record the measurement SS1 Resistance operator in center ______________________ Ohms If the contacts are good the resistance should be infinite open This is the first step of testing the selector switch The next step is to test it when the ...

Страница 11: ...ws Figure 2 7 Actual Measurement of Contacts C Rotate the selector switch to the left position and record the resistance SS1 Resistance operator in left ________________________ Ohms If the contacts are good the resistance should be at or near zero This shows that the contacts are closing when the operator is switched This selector switch should be good COM Ω Ω N O CONTACT BLOCK ...

Страница 12: ...__________ Ohms Component Status _________________________________ Good Bad This time you should find that the multimeter measures infinite resistance in both conditions This means that there is an open in the contacts The component is bad E Click the Clear Fault button to clear the fault or remove the fault plug and replace it with the standard jumper plug After inserting the standard jumper go t...

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