Problems with Honeywell DCS system cards
Thread Content
The Honeywell EPKS system uses C300 controllers, with AI/AO/DI/DO cards connected to them. One of the AO points in my system is associated with the card link-BAR-MTL5546Y-field i/p. When using a multimeter to measure TB1-1 and TB1-2 on that card, the voltage is 5.5VDC, while the voltage at the safety gate terminals of MTL5546Y in the same row is 1.9V. Why is the voltage different at the safety gate terminals in the same row? Seeking your advice···
The AI outputs are all 24VDC; why is this different?
:@:@:@:@:@:@:@
Are your TB1-1 and TB1-2 the terminal blocks between the safety barrier and the field locator? It’s best to first insert the multimeter to measure the current; if the current is not the same, then the voltage should be different as well.
It’s the terminal on the card； The current hasn’t been measured yet; I’ll check it by connecting it tomorrow
AO does not require 24V power supply for the field devices; although its maximum voltage can reach 24V, the voltage that is measured is the sending current multiplied by the inherent resistance of the circuit.