ABB C1300 User Manual page 50

C1300
Advanced circular chart recorder
Example – Reservoir level monitoring using:

process variable 1 with an engineering range of 0 to 100 feet

logic equation 1 result assigned to relay 1.1 that is used to operate the control valve.
Control
Valve
Alarm B1
Alarm A1
80
50
feet
feet
Flow Conditions
Close reservoir control valve if:
• Reservoir level >50 feet AND
rate of change >10 ft/hr
OR
• Reservoir level >80 ft
OR
• Manual override switch operated
48
Manual Overide
Relay Output
Level Sensor
Input Elements
• Alarm A1 – set to high process trip at 50 ft
• Alarm B1 – set to high process trip at 80 ft
• Alarm C1 – set to fast rate trip at 10% of
range per hour (10 ft/hr)
• Manual override switch:
Connected to digital input 1.1
Digital input number
Module number
Negative polarity
Volt-free switching
3 Configuration
Rate of
change
Level
> 10ft/h
Time
Alarm C1
Entering the Logic Equation
IM/C1300 Rev. J