Programmed Data Diagnostics; Temperature Diagnostics; Cooling Fan Control; Fan Test - TECSYSTEM NT538 WS Instruction Manual

PROGRAMMED DATA DIAGNOSTICS

In case of failure of the internal memory or corruption of programmed data, just after switching on, Ech appears with the
relevant Fault contact signal.
In this case, for safety reasons, the default parameters are loaded automatically (see programming table on pages 13-14).
Eliminate the Ech indication by pressing RESET and run programming to enter the desired values.
Finally switch the unit off and back on to check the memory works correctly, if it is damaged Ech will be displayed again
(send the control unit to TECSYSTEM srl for repairs).

TEMPERATURE DIAGNOSTICS

When one of the temperature sensors senses a temperature 1°C higher than the alarm threshold, 5 seconds later the
ALARM relay switches and the ALARM LED of the affected channel (CHn) lights up.
When the trip temperature limit is exceeded, , 5 seconds later the TRIP relay switches and the TRIP LED of the affected
channel (CHn) lights up.
As soon as the recorded temperature returns to values equal to or lower than the limit set for the ALARM and TRIP relays
switching, these relays de-energise and the corresponding LEDs switch off.
The ALARM and TRIP values are kept in the internal memory: they can be recalled by entering the Vis modes
(programmed parameter display) and modified in PRG (programming) mode.

COOLING FAN CONTROL

The unit NT538 WS has two contacts FAN (FAN1 and FAN2), if properly programmed, can control ON-OFF of fans for
cooling system checked.
The high flexibility of the NT538 WS allows you to select, for each channel, an operation mode for contact management of
FAN1 and FAN2. During the programming of the individual channel, enabled, you will be asked to select one of the
following ways to activate FAN, dedicated to that channel:

YES FAN1+ FAN2 enabled flashing
The selected channel, CHn, will enable the switching of both FAN1 and FAN2 contacts in relation to the ON – OFF
thresholds programmed for FAN1 and FAN2.

YES only FAN1 enabled flashing
The selected channel, CHn, will enable the switching of the FAN1 contact in relation to the ON – OFF thresholds
programmed for FAN1

YES only FAN2 enabled flashing
The selected channel, CHn, will enable the switching of theFAN2 contact in relation to the ON – OFF thresholds
programmed for FAN2.

NO FAN1+ FAN2 disabled flashing
The FAN function on the selected channel, CHn, is disabled. No FAN threshold is associated with the selected channel.
The FAN1 thresholds: (ON - OFF) and FAN2: (ON - OFF) are common for all CHn channels enabled, programmable in
steps 12-19 of programming page 13.
FAN1: (e.g. ON at 70°C - OFF at 60°C)
FAN2: (e.g. ON at 45°C - OFF at 35°C)
The values of ON and OFF can be programmed depending on the range of the device, FAN ON must always be greater by
at least 1 °C since FAN OFF (recommended Δ FAN POWER ON-OFF + 10 ° C).
The FAN 1 / FAN 2 LED light up when the temperature exceeds 1°C the FAN ON threshold, the corresponding relay
switches, and turns off when the temperature goes below 1°C the FAN OFF threshold, the corresponding relay switches.

FAN TEST

It is possible, by programming (HFn), to make sure that the fans are operated for 5 minutes every xxx" hours, regardless
of the temperature values of the columns or the environment (e.g.: with HFn = 001 the fans are activated for 5 minutes
every hour).
This function is designed to periodically check the operation of the fans and of their control equipment.
Setting NO, this function is inhibited.
To enable the HFN function, read the programming section on pages 13-14.
IMPORTANT INFORMATION
Before carrying out the isolation test of the electrical panel the control unit is installed on, disconnect it together
with the sensors from the power supply to prevent it from being seriously damaged.
NT538 WS
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