8
NT539
DISPLAY
The first display is dedicated to show the temperatures.
Second display to show the monitored channel.
Pressing MODE key, the display mode is loaded:
•
SCAN
: the monitoring unit displays all the activated (°C) and deactivated (NO) channels scanning every 2 seconds.
•
AUTO
: the monitoring unit displays the hottest channel automatically.
•
MAN
: manual reading of the channel temperature using the up/down keys
.
•
T.MAX
: the monitoring unit displays the highest temperature reached by the sensors and any situation of alarm or
fault occurred, after the last reset. Select channels with cursors
, reset values with RESET.
OPERATING PROGRAM CONTROL
To control the protection levels programmed, press the PRG button twice to access the
VIS
display mode. By repeatedly
pressing the PRG button, you can scroll through all the previously loaded values in sequence.
After 1 minute's keyboard inactivity, the programming display procedure is automatically abandoned.
To stop the display, press the ENT button.
LED TEST
We suggest carrying out the control unit LED test regularly.
For this operation, press the TEST key briefly; all the displays turn on for 2 seconds.
If one of the LEDS does not work, please return the control unit to TECSYSTEM for repair.
ALARM RELAY TEST
This function allows carrying out a test of the relay operation without having to use any other devices.
To start the test procedure, keep the TEST button pressed for about 5 seconds: TST appears for 2 seconds, confirming
you have entered Relay Test mode.
The LED that is lit shows the relay to be tested; use the cursors
to select the desired relay.
Press the SET and RESET keys to energise and de-energise the relay to be tested; the display will show ON-OFF.
After 1 minute's keyboard inactivity, the RELAY TEST procedure will be automatically abandoned. To stop the RELAY
TEST procedure, press the TEST key.
Alternatively, you can use the PT100 simulator model: SIM PT100.
ALARM RELAY SILENCING
If you want to silence the ALARM signal, press the RESET key: the relay de-energises and the ALARM LED, which was
fixed, will start flashing.
Silencing is automatically disabled when the temperature goes below the ALARM threshold.
