ABB AX400 Series User Manual page 67

Single and dual input analyzers for pH/Redox (ORP)
AX416, AX436, AX460, AX466 & AX468
Relay Outputs – On/Off
Number of relays
Three supplied as standard or five with option board fitted
Number of set points
Three supplied as standard or five with option board fitted
Set point adjustment
Configurable as normal or failsafe high/low or diagnostic alert
Hysteresis of reading
Programmable 0 to 5 % in 0.1 % increments
Delay
Programmable 0 to 60 s in 1 s intervals
Relay contacts
Single-pole changeover
Rating 5 A, 115/230 V AC, 5 A DC
Insulation
2 kV RMS contacts to earth/ground
Analog Outputs
Number of current outputs (fully isolated)
Two supplied as standard or four with option board fitted
Output ranges
0 to 10 mA, 0 to 20 mA or 4 to 20 mA
Analog output programmable to any value between 0 and 22 mA to
indicate system failure
Accuracy
±0.25 % FSD, ±0.5 % of reading (whichever is the greater)
Resolution
0.1 % at 10mA, 0.05 % at 20 mA
Maximum load resistance
750 at 20 mA
Configuration
Can be assigned to either measured variable or either sample
temperature
Digital Communications
Communications
Profibus-DP (with option board fitted)
IM/AX4PH Rev. P
Control Function – AX460 Only
Controller Type
P, PI, PID (configurable)
Control Outputs
Output
Can be assigned a maximum of two relays, two analog outputs, or
one of each
Analog
Current output control (0 to 100 %)
Time proportioning cycle time
1.0 to 300.0 s, programmable in increments of 0.1 s
Pulse frequency
1 to 120 pulses per minute, programmable in increments of 1 pulse
per minute
Controller action
Reverse, direct or bi-directional (programmable)
Proportional band
0.1 to 999.9 %, programmable in increments of 0.1 %
Integral action time (Integral reset)
1 to 7200 s, programmable in increments of 1 s (0 = Off)
Derivative
0.1 to 999.9s programmable in increments of 0.1s, available only for
single set point control
Auto/Manual
User-programmable
Access to Functions
Direct keypad access
Measurement, maintenance, configuration, diagnostics and service
functions
Performed without external equipment or internal jumpers
Sensor Cleaning Function
Configurable cleaning action relay contact
Continuous
Pulse in 1 s on and off times
Frequency
5 minutes to 24 hours, programmable in 15 minute increments up to
1 hour then in 1 hour increments for 1 to 24 hours
Duration
15 s to 10 minutes, programmable in 15 s increments up to 1 minute
then in 1 minute increments up to 10 minutes
Recovery period
30 s to 5 minutes, programmable in 30 s increments
9 Specification
65