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Asco 7000 Series - User Manual

Asco 7000 Series
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ASCO 7000 SERIES ACTB
Automatic Closed-Transition Transfer &
Bypass-Isolation Switches
H design 600 through 1200 A
Operator’s Manual
381333-194 B
9/2016
DANGER is used in this manual to warn of a
hazard situation which, if not avoided, will result
in death or serious injury.
WARNING is used in this manual to warn of a
hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION is used in this manual to warn of a
hazardous situation which, if not avoided, could
result in minor or moderate injury.
Refer to the outline and wiring drawings provided with
your 7000 Series ACTB for all installation and
connection details and accessories.
Refer to Group 5 Controller User’s Guide 381333–126
for ATS status display messages, time delays, pickup &
dropout settings, and adjustments.
Rating Label
Each 7000 Series 7ACTB contains a rating label to
define the loads and fault circuit withstand/closing
ratings. Refer to the label on the Transfer Switch for
specific values.
Do not exceed the values on the rating label.
Exceeding the rating can cause personal injury
or serious equipment damage.
An experienced licensed electrician must install the
7ACTB.
600-1200 amp sizes

Table of Contents

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Questions and Answers

  • R
    Robert BrownAug 13, 2025
    What to do if Asco 7000 Switch doesn't transfer load to emergency source?
    • C
      christopher12Aug 13, 2025
      If the Asco Switch doesn't transfer the load to the emergency source after the generator starts, verify that the generator output circuit breaker is closed and the generator frequency is at least 95% of nominal (57 Hz for a 60 Hz system). Also, ensure the voltmeter reads at least 90% of the nominal phase-to-phase voltage between terminals EA and EC (or EL1 and EL2 for 2-pole switches). You may need to wait for the Feature 2B time delay to time out.
  • W
    Wyatt HuntAug 17, 2025
    Why won't my Asco 7000 Switch transfer the load back to normal source?
    • H
      Heather BrownAug 17, 2025
      If the Asco Switch fails to transfer the load back to the normal source when power returns or when releasing the Transfer Control switch, ensure the voltmeter reads at least 90% of nominal phase-to-phase voltage between terminals NB and NC, NC and NA, and NA and NB (or NL1 and NL2 for 2 pole switches). Also, wait for the Feature 3A time delay to time out.
  • D
    Douglas MooreAug 20, 2025
    How to troubleshoot an Asco 7000 engine-generator set that won't start?
    • K
      kevincrawfordAug 20, 2025
      If your Asco Switch engine-generator set doesn't start when holding the Transfer Test switch or when the normal power source fails, ensure the starting control is in the automatic position, and that batteries are charged and properly connected. Also, inspect the wiring to the engine starting contacts. Hold the Transfer Test switch for 15 seconds, or ensure the power outage lasts long enough for the Feature 1C time delay, engine cranking, and starting to complete.
  • C
    Casey JohnsonAug 25, 2025
    How to fix an Asco 7000 Switch generator that won't stop after retransfer?
    • K
      Kari WilliamsAug 26, 2025
      If the generator doesn't stop after the load is transferred back to the normal source with your Asco Switch, ensure the starting control is in the automatic position. Also, wait for the Feature 2E time delay to time out.
  • S
    Scott HowellAug 28, 2025
    What does it mean when the '7ACTB Failure to Synchronize' light is on for Asco Switch?
    • M
      Michael EdwardsAug 28, 2025
      If the '7ACTB Failure to Synchronize' light illuminates on your Asco Switch, it indicates that the normal or emergency power source conditions are not suitable for a closed transition transfer. Recheck the voltage and frequency of both power sources, then press the Alarm Reset pushbutton.
  • C
    connie58Sep 1, 2025
    What causes the '7ACTB Extended Parallel Time' light to come on in Asco 7000 Switch?
    • K
      kelly75Sep 1, 2025
      If the '7ACTB Extended Parallel Time' light comes on for your Asco Switch, it means that the CN and CE contacts are closed longer than the controller setting. Open the disconnected source circuit breaker.
  • A
    Alexis BakerSep 5, 2025
    What does the '7ADTB Load Disconnect Active' light on Asco 7000 Switch mean?
    • K
      Kristy TurnerSep 5, 2025
      If the '7ADTB Load Disconnect Active' light comes on for your Asco Switch, it indicates a delayed transition transfer operation.
  • B
    Barbara GoodmanSep 8, 2025
    What does it mean when the '7ACTB TS Locked Out' light is on for Asco 7000?
    • K
      Kevin HillSep 8, 2025
      If the '7ACTB TS Locked Out' light is on for your Asco Switch, a transfer lockout operation has occurred, disabling the transfer switch from automatic operation. Open the disconnected source circuit breaker.

Summary

Nameplate

Catalog Number Identification

Explains the elements of a typical 7000 Series ACTB catalog number for switched neutral, 3 pole, 600 amp, 480 V, Type 1 enclosure.

Installation

Installation Steps

Covers removing the skid, preparing the foundation, and mounting the unit according to outline drawings.

Electrical Connections and Grounding

Details line connections, conductor testing, grounding, and harness connections per code and diagrams.

Functional Test

Voltage Checks

Procedure to check phase-to-phase and phase-to-neutral voltages at normal and emergency source terminals.

Electrical Operation

Procedure to check the electrical operation of the ACTS, including transfer control switch operations.

Testing & Service

Transfer Test

Monthly procedure to check the electrical operation of the Transfer Switch and Controller.

Preventive Maintenance

Recommendations for annual preventive maintenance to ensure reliability and long life.

Replacement Parts

Information on how to order replacement parts, requiring specific identification numbers.

Disconnecting the Controller

Procedure for safely disconnecting the controller for repair purposes.

Manual Load Transfer

Procedure for manually transferring load if the Transfer Switch or Control Panel is out of service.

Trouble-Shooting

Guides users through common problems and their systematic checks for operation, generator set, and voltage.

Maintenance Handle

Instructions on how to use the maintenance handle to manually operate the transfer switch contacts.

Bypassing & Isolating

Bypassing the ATS

Procedure for bypassing the closed transfer switch contacts, requiring specific handle positions.

Bypass to Normal Source

Step-by-step guide to bypass the ATS to the Normal source, including handle and indicator status.

Bypass to Emergency Source

Step-by-step guide to bypass the ATS to the Emergency source, including handle and indicator status.

Isolating the ATS

Procedure for isolating the ATS, involving turning the Isolation Handle to TEST and ISOLATE positions.

Contact Inspection

Procedure for inspecting the condition of the main and arcing contacts annually.

Return to Service

Operate to NORMAL

Procedure to change the transfer switch position to NORMAL using the Transfer Control switch.

Operate to EMERGENCY

Procedure to change the transfer switch position to EMERGENCY using the Transfer Control switch.

Un-Bypass Normal Source

Procedure to return the bypass to the Normal source, including handle and indicator status.

Un-Bypass Emergency Source

Procedure to return the bypass to the Emergency source, including handle and indicator status.

Asco 7000 Series Specifications

General IconGeneral
TypeAutomatic Transfer Switch
Amperage Range30-4000A
Poles2, 3, 4
Enclosure TypeNEMA 1, 3R, 12
StandardsUL 1008, CSA C22.2, IEC 60947-6-1
Control PanelAdvanced microprocessor control

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