17
NT538 WS EVO
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 thermometers detects a temperature higher than 1 ° C with respect to the pre-set value as the alarm limit,
after approximately 5 seconds the
ALARM
relay switches and the channel
ALARM
LED (CH
n
)switches on.
When the trip temperature limit is exceeded, after approximately 5 seconds the
TRIP
relay switches and the channel
TRIP
LED (CH
n
) switches on.
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 values of
ALARM
and
TRIP
are kept in the internal memories: they can be recalled by entering the Vis modes (displaying
programmed parameters) and modifiable in the PRG mode (programming).
COOLING FAN CONTROL
The NT538 WS control unit is fitted with two FAN contacts (FAN1 and FAN2) and, if programmed correctly, can control the
fans switching ON and OFF to cool the controlled system.
The high flexibility of the NT538 WS EVO is used to choose, for each channel, an operating mode to manage the contacts of
FAN1 and FAN2. While programming the individual enabled channel, there will be a prompt to select one of the following FAN
activation modes, dedicated to that channel:
•
YES FAN1 + FAN2 enabled flashing
The selected channel, CH
n
, will enable the switching of both contacts FAN1 and FAN2 in relation to the ON - OFF
thresholds programmed for FAN1 and FAN2.
•
YES only FAN1 enabled flashing
The selected channel, CH
n
, will enable switching of the FAN1 contact in relation to the ON - OFF thresholds programmed
for FAN1.
•
YES only FAN2 enabled flashing
The selected channel, CH
n
, will enable switching of the FAN2 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 thresholds of FAN1: (ON - OFF) and FAN2: (ON - OFF) are common for all enabled CH
n
channels, 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 ON and OFF values are programmable according to the range of the device, FAN ON must always be at least 1°C higher
than the recommended Δ FAN (ON_OFF) +10°C.
The FAN 1/ 2 LED lights 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.
