REV2-12
TLC Series
haywardflowcontrol.com
6. PRINCIPLE OF OPERATION
6.1. MEASUREMENT MODE
After turning the power supply on, device ID and software version are shown on the display, next the
controller will go into the measurement mode.
In the measure mode, the measurement results, converted over selected characteristic, are displayed on the
LED display. The measurement range equal to the nominal range is called: nominal measurement range, and
the measurement range equal to the extended nominal range is called: permissible measurement range
(Figure 6.1, 6.2).
If the measurement value does not exceed permissible measurement range but displayed value
exceeds range -999 - 9999, the warning "-Ov-" is displayed rather than the calculated value.
In the measurement mode user can check main threshold values. After pressing [^] or [v] button, name of
the threshold (e.g. "rEL1") and the value will be displayed on the display in an alternating mode. If [^] or [v]
is pressed within 5 sec, the next threshold will be displayed, otherwise the device will return to the
measurement mode. If a free access is enabled (see description of "SECu" menu), user can change the value
of particular threshold pressing button [ENTER] (see : PARAMETERS EDITION).
Input type, range of displaying values, characteristic of conversion, decimal point position, and measure
filtering ratio, are user configurable parameters. All accessible parameters can be changed by entering the
menu (see: DEVICE PROGRAMMING). Use the local keyboard or the remote controller to do it. (Note: All
parameters can be remotely changed via RS-485 interface).
Configuration of the device (via menu or RS-485 interface) does not stop the measurements.
nominal measurement range
permissible measurement range
4 mA
20 mA
Figure 6.1. Definitions of measurement ranges in mode 4-20mA
"Lo r" parameter
"Hi r" parameter
