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Insufficient voltage
trouble

Edwards EST EST4

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What This Code Means

The power supply voltage has dropped below the minimum operating threshold.

Common Causes

  • 1Loss of AC primary power
  • 2Failed power supply charging circuit
  • 3Excessive current draw on the 24VDC rails

Resolution Steps

Check the AC power source and circuit breakers. Measure the output voltage of the power supply and check for overloaded circuits.

Manual References(2)

Field Notes

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Related Codes

SUPERVISORYThe control unit enters the supervisory state when a point signals a supervisory condition, such as a valve tamper switch activation or a system-level supervision fault.A short is detected on the loopA shorted circuit has been detected on the Signature loop controller (SLC) wiring, which typically reports a trouble condition on all devices on that circuit.TroubleGeneral fault within the system hardware or wiring that prevents normal operation.Ground faultThe system detects a low resistance path (approximately 10 kΩ or less) between a circuit conductor and earth ground, or voltages outside the range of 12.3 VDC to 16.8 VDC during testing.bad type faultThis condition occurs when a substituted device is a different model than the suspect device but is preprogrammed with the same device address.

Related Questions

How do I perform a walk test on the EST4, and can individual SLC loops be isolated for testing?What are the battery sizing requirements for the EST4, and what is the replacement procedure?What is the maximum SLC loop length and device count per loop on the EST4?
All EST4 trouble codesEST4 panel page