PROGRAMMED DATA DIAGNOSTICS
In case of failure of the internal memory or alteration of the programmed data, at start-up Ech is displayed
with the relative warning of the Fault contact.
In this case, for safety reasons, the default parameters are loaded automatically (see the programming table on pages
12-15 according to the model purchased).
Eliminate the Ech message by pressing RESET and 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 repair).
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 interested channel (CHn) switches on.
When the trip temperature threshold is exceeded, the TRIP relay switches and the TRIP LED of the interested channel
(CHn) lights up.
As soon as the temperature goes back to values equal to or lower than the threshold set for the ALARM and TRIP relays,
these relays deenergise and the relative 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
If properly programmed, the T154 unit can control the fans switching ON and OFF to cool the transformer according to
preset temperatures.
The fans on board the machine can be controlled two ways:
Using the temperatures sensed by the sensors on the three columns
CHF 1.2.3
(ex. ON at 80°C - OFF at 70°C) - (ex. ON at 176°F - OFF at 158°F)
With an extra sensor (CH4/YES) dedicated to the ambient temperature inside the transformer room.
CHF 4
(ex. ON at 40°C - OFF at 30°C) - (ex. ON at 104°F - OFF at 86°F)
The ON and OFF values are programmable according to the device range.
FAN TEST
By programming (HFn), it is possible to have the fans operating 5 minutes every "xxx" hours, regardless of the column or
ambient temperature values (i.e.: with HFn=001 the fans are activated for 5 minutes every hour).
This function aims at verifying the fan operation and their control apparatus periodically.
Setting 000 as a value inhibits the function.
IMPORTANT WARNING
Before carrying out the insulation test of the electrical panel the control unit is installed on, disconnect it from the
power supply to prevent it from being seriously damaged.
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