West Control Solutions CALogix - Manual (Page 20)

− 0-5V
Models with 0 to 5V input use an internal resistor to spread the signal across the input range 0 to 50 mV using a
divider of 100. Where a transducer provides a smaller output, the input maximum and minimum values can be
similarly calculated.
− 0-10V
Models with 0 to 10V input use an internal resistor to spread the signal across the input range 0 to 50 mV using a
divider of 200. Where a transducer provides a smaller output, the input maximum and minimum values can be
similarly calculated.
Decide what scale minimum and maximum will be required, and whether the scale needs inverting.
Example
The example below gives an example of how a 4–20mA input could be configured for an application.
The input to the controller is linear where 4mA = 80 units and 20mA = 300 units.
Action
Parameter Menu Parameter Value
Select input sensor type
Input settings linear
Select unit
Module settings select from list, if unit not available select Set
Allocate SP1 output
Output settings Select output 1, 2 or 3
Enter Linear high
Input settings Enter 50 (represents 20mA i.e. multiplier 2.5)
Enter Linear low
Input settings Enter 10 (represents 4mA i.e multipler 2.5)
Enter Linear low scale
Input settings Enter 80 (i.e. units at 4mA)
Enter Linear high scale
Input settings Enter 300 (i.e. units at 20mA)
Enter display resolution
Input settings Set as 0.01, 0.1, 1
Note: changing the display resolution will affect set-point value and other operating parameters. Ensure that
display resolution settings are selected before adjusting set-point and tuning the controller to the application.
ERROR MESSAGES
CALogix-sw error messages are shown below
Tune Fail -
Will be displayed if an autotune cycle fails
1. Check setpoint is not set at 0
2. The characteristics of the load exceed the algorithm limits
i. Change conditions e.g. raise setpoint
ii. Try tune at setpoint, atsp
iii. If error persists call local CAL representative.
Input Fail –
Sensor is open/short circuit or linear input is over range. Check sensor/wiring/connections.
Error On/Off – Error On/Off
will be displayed if autotune when in On/Off control.
PID
MODULE SETTINGS (* = module position number)
Module * - settings Default Options
Module name
Module * User defined
A user defined label (name) up to 10 characters can be set for each module.
Operating units
None °C, °F, Bar, PSI, PH, RH, Set, None
Process-value operating units can be defined as °C, °F, Bar, PSI, Ph, RH or Set.
Important note : If switching from °C to °F or vice versa, ensure that set-point and other temperature-value based parameter
settings are adjusted accordingly to reflect the change made. Failure do so may result in dangerous operation or damage to the system.
Module * – input settings Default Options
Sensor Type
J B, E, J, K, L, N, R, S, T, RTD 2-wire, RTD 3-wire, linear,
custom sensor**, custom sensor with cjc**.
**consult factory
Display Resolution 1 0.01, 0.1, 1
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