The application is a control system for four fuel dispensers.
There are eight inputs:
Four contact closures (or 122V AC)
Four 122V AC sources
Six outputs:
Contact closures (or 120V AC)
The site is now controlled by:
Four time delay relays
Eight SPST relays
The logic is:
Fuel control system closes contact for a dispenser (contact closure or 122 VAC input to PLC)
Timer starts
And Start Pump & pipe leak detector (same contact closure or 120 VAC output from PLC)
When time for leak detection ends (timer), and dispenser's meter starts (122VAC input to PLC), then dispenser-valve opens (120 VAC output from PLC)
There are two fuel pumps, & four dispensers, two dispensers for each fuel.
The goal is to provide more reliable service, fewer points of contact failure, easier service, and lower cost. The cost is now $155 for relay parts and 8 hours for installation.
Are some models or brands better?
Thanks in advance for your advice.
There are eight inputs:
Four contact closures (or 122V AC)
Four 122V AC sources
Six outputs:
Contact closures (or 120V AC)
The site is now controlled by:
Four time delay relays
Eight SPST relays
The logic is:
Fuel control system closes contact for a dispenser (contact closure or 122 VAC input to PLC)
Timer starts
And Start Pump & pipe leak detector (same contact closure or 120 VAC output from PLC)
When time for leak detection ends (timer), and dispenser's meter starts (122VAC input to PLC), then dispenser-valve opens (120 VAC output from PLC)
There are two fuel pumps, & four dispensers, two dispensers for each fuel.
The goal is to provide more reliable service, fewer points of contact failure, easier service, and lower cost. The cost is now $155 for relay parts and 8 hours for installation.
Are some models or brands better?
Thanks in advance for your advice.