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NT579-NT579 RS485
TECSYSTEM SHANGHAI
8) PROGRAMMED DATA DIAGNOSTIC
In case of breaking of the internal storage or corruption of the programmed data,
just after switching on, the Ech wording is displayed in the messages page with
the relevant reporting of the Fault contact.
In this case, the default setting is restored as in the Pag. 6 in the section “ECH
ERROR”
To remove the Ech wording, press RESET and run programming to insert the de-
sired values.
After the auto reboot of the unit verify the correct memory working; in case it is
damaged and the Ech wording is still displayed, please return the monitoring
unit to Tecsystem for repair).
9) MEASURING CIRCUIT DIAGNOSTIC
In case of breaking of the internal measuring circuit CAL wording is displayed in
the messages page with the relevant reporting of the Fault contact.
Please return the monitoring unit to Tecsystem for repair.
To remove the CAL wording, press RESET.
10) TEMPERATURE DIAGNOSTIC
If one of the temperature sensor detects a temperature higher than 1°C com-
pared to set value as alarm limit, after approximately 5 seconds ALARM relay
switches together with the turning on of ALARM LED if the channel is selected
on the CHANNEL display.
When the release temperature limit is passed, TRIP relay switches together with
the turning on of TRIP LED if the channel is selected on the CHANNEL display
As soon as the taken temperature return to equal or lower values than the set
limit for ALARM and TRIP relay switching, they de-energise with consequent
turning off of the relevant LED’s.
11) COOLING FAN CONTROL
NT579 monitoring unit, if opportunely programmed, can control ON-OFF of fans
accompanying the transformer, according to set temperatures.
12) FAN TEST
It is possible, through programming (HFn), impose that fans are activated for 5
minutes each “xxx” hours, regardless of column or room temperature values
(example: with HFn=001 fans are activated for 5 minutes each hour).
This function has the aim to periodically verify the working of the fans and their
control apparatus during long idle periods.
Loading “no” value this function is inhibited.
During the self-test of the fans, the LED fan is lit on all channels
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