TESTING & SERVICE (continued)
TROUBLE-SHOOTING
Note any optional accessories that may be furnished on the ADTB and review their operation. Refer to any separate drawings and/or instructions that may be packed with the ADTB.
Hazardous voltage capable of causing shock,
burns, or death is used in this switch. Do not touch the power or load terminals of the bypass switch or transfer switch!
Table
PROBLEM | CHECK IN NUMERICAL SEQUENCE | ||
1 | 2 | 3 | |
| OPERATION | VOLTAGE | |
Hold Transfer Test switch 15 | Starting control must be in the |
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not start when the Transfer | seconds or the outage must | automatic position. Batteries |
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Control switch is turned and | be long enough to allow for | must be charged and | — |
held in Transfer Test position | Feature 1C time delay plus | connected. Check wiring to |
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or when normal source fails. | engine cranking and starting. | engine starting contacts. |
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Transfer switch does not | Wait for Feature 2B time delay | Generator output circuit | Voltmeter should read at least |
transfer the load to the | to time out. | breaker must be closed. | 90% of nominal phase to |
emergency source after the |
| Generator frequency must be | phase voltage between |
| at least 95% of nominal (57 Hz | transfer switch terminals EA | |
|
| for a 60 Hz system.) * | and EC (or EL1 and EL2 for 2 |
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| pole switches). * |
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Transfer switch does not | Wait for Feature 3A time delay |
| Voltmeter should read at least |
transfer the load to normal | to time out. |
| 90% of nominal phase to |
source when normal returns |
|
| phase voltage between |
or when the Transfer Control |
| — | transfer switch terminals NB |
switch is released. |
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| and NC, NC and NA, and NA |
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| and NB (or NL1 and NL2 for 2 |
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| pole switches). |
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Wait for Feature 2E time delay | Starting control must be in the |
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not stop after load retransfer | to time out. | automatic position. | — |
to the normal source. |
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* These are factory settings. Refer to Controller User’s Guide.
If the problem is isolated to circuits on the controller or the transfer switch, call ASI or your local ASCO Power Technolo- gies sales office. Furnish the Serial No., Catalog No., & BOM No. from the transfer switch nameplate.
MANUAL LOAD TRANSFER | MAINTENANCE HANDLE |
This procedure manually transfers load to other source if the Transfer Switch or Control Panel are out of service.
Close enclosure doors to prevent personal injury in case of electrical system fault.
1.Be sure that the Bypass Handle is CLOSED on either Emergency or Normal (see page
2.Be sure that the Isolation Handle is in the TEST or ISOLATE position (see page
3.Turn the Bypass Handle counterclockwise to OPEN the Bypass Switch. Then Bypass to the other source (see page
Bypass and isolate the Transfer Switch before using the maintenance handle! See pages
Turn counterclockwise to OPEN contacts.
Turn clockwise to |
| Grasp |
CLOSE contacts. |
| handle |
slide hub | insert | firmly |
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handle |
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onto shaft |
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into hole |
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& insert pin |
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Pull out shaft to operate | Push in shaft to operate | |
Emergency contacts. | Normal contacts. |