POWER SUPPLY
The T54 ED16 series has UNIVERSAL power supply, i.e. it can be supplied by 24 to 240 Vac-Vdc, 50/60Hz irrespectively of
polarity in Vdc (terminals 40-42).
This is obtained thanks to the use of a tested power supply unit, newly designed and manufactured, that frees installers from
worrying about the correct Vac and Vdc supply.
The ground must always be connected to terminal 41.
When the unit is supplied directly by the secondary of the transformer to protect, it can be burnt out by strong overvoltages.
This happens if the main switch is closed and the transformer has no load (blank test). The above-mentioned problems are
much more evident when the 220 Vac voltage is taken directly from the transformer secondary bars and there is a fixed
capacitor battery to phase the transformer itself.
If an existing control unit must be replaced with a new one, to guarantee its correct and safe operation, the
sensor/relay/supply connecting terminals must be replaced with the new terminals supplied.
ALARMS AND VENTILATION
Carry out the electrical connections on the removable terminal blocks only after disconnecting them from the unit.
When the control unit is in one of the modes mentioned below, it does not monitor the temperature and the relays are all
blocked. The fault contact switches and the fault LED flashes.
Vis. programming display
PRG programming
Relay test
The ALARM and TRIP relays switch only when the set temperature thresholds are exceeded.
The FAULT contact, programmed in failsafe mode (default YES), switches when the equipment is powered only if the unit
detects no fault on start up, and stays in this condition until one of the following events occurs:
Data storage fault (Ech message).
Pt100 sensor fault (FCC short-circuited sensor, FOC interrupted sensor or Fcd quick temperature
increase)
CAL damage to the measurement circuit.
Insufficient supply voltage.
During the power on reset after programming (PRG), displaying the data (VIS) and Test relay.
The FAULT failsafe can be disabled selecting FAULT failsafe "NO" see step 26-31 programming page 13.
NOTE: do not connect the FAULT relay to the transformer tripping circuit to avoid unwanted system interruptions.
FAULT CONTACT SWITCHING (failsafe enabled)
The FAN1 contact can be used to control the cooling fans, or it can be included in the conditioning system of the
transformer room, see paragraph Fan control on page 15.
NOTE: always disconnect the unit before performing any electrical connections.
FAULT AND RESET MESSAGE SEQUENCE
Find below the sequence of fault messages and RESET function condition.
1) ECH
2) CAL
3) FCD
4) ERR PT
Eeprom fault
Measurement circuit fault
Temp. quick increase fault
FOC or FCC sensor fault
erasable message
erasable message
resettable condition
non- resettable condition
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