Display; Operating Program Control; Notes On Scan And Man Functions; Led Test - TECSYSTEM NT538 WS Instruction Manual

DISPLAY

The first display is dedicated to temperatures.
The second display to the monitored channel.
When the device is switched on or after a reset, the model of the NT538 control unit, the type of sensors, VER "00"
(firmware version), the temperature range of the device and the WS (web server) identification are always shown on the
display.
Pressing the MODE key, the display modes can be set:

SCAN: the control unit shows in scanning (every 2 seconds) all the enabled (°C) and disabled (NO) channels.

AUTO: the control unit displays the hottest channel automatically.

MAN: manual reading of the channel temperature using the up/down keys

T.MAX: the control unit displays the maximum temperature reached by the sensors, any situations of alarm or fault that
have occurred since the last reset. Select channels with cursors

OPERATING PROGRAM CONTROL

To control the protection levels programmed, press the PRG key twice to access the VIS programme. Repeatedly pressing
the PRG key, 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 key.

NOTES ON SCAN AND MAN FUNCTIONS

During the SCAN and MAN modes, the operation of the NT538 can be displayed.
1) RUN cPU:
This message appears when the device is turned on.
2) Ech Err:
This message appears when damage in the EEPROM memory is detected.
Pressing Reset will cancel the message and restore the original default parameters, listed in the programming
paragraph on pages 13-14. Return the control unit to TECSYSTEM for repairs.
3) CAL Err:
This message appears when damage is found in the measurement circuit.
The temperature values displayed might be incorrect. Return the control unit to TECSYSTEM for repairs.
4) Pt Err :
This message appears when it is detected that one or more PT100 sensors are not working correctly, FOC, FCC
and FCD indications in the temperature sensor diagnostics paragraph on page 16.
In case of Err the FAULT relay will be de-energised.
The above messages will be displayed following the 1-2-3-4 priority stated.
NOTE: in any display mode in case of faulty sensor failure (fcc, foc or fcd) the control unit will automatically set up in SCAN
mode (PRIVILEGED SCAN) allowing immediate displaying of the fault condition on the relative CHn channel (the Mode
key is disabled ).

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 you to carry out a test of the relay operation without having to use further devices. To start the test
procedure, press and hold the TEST button for approximately 5 seconds: the TST indication appears for 2 seconds
confirming entry into the Relays Test mode.
The LED that is lit shows the relay to be tested; use the cursors
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 it is possible to use the PT100 model simulator: 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.


, reset the values with RESET.

to select the desired relay.
NT538 WS
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