Unit installation

63
MALFUNCTIONS AND CORRECTIVE ACTIONS
1) Controller does not respond to keyboard
a) Check serial cable integrity.
b) Check serial cable connections on both the User Interface Board and the Main Board.
c) Check correct and tight insertion of jumpers TU1 and TD1 on the User Interface Board, main and/or
auxiliary board.
d) Check dip switches and integrity on the User Interface Board.
2) Several analog values reading incorrectly
a) Check correct and tight connection of the probes to the board.
b) Check the probe cable: test for short-circuit.
c) The pressure transducer probe is a 4-20mA transmitter check the polarity of the connection on the
Board.
d) Check if the power supply voltage is into the specified limits: 24Vac +/- 10%.
e) The temperature probe is a PTC sensor disconnect it from the board and measure its resistance that is
1000 ohm at 25°C or 1200 ohm at 50°C.
f) Check jumper configuration (see the respective wiring diagram).
3) Digital input reading incorrectly
a) Check if the auxiliary 220 Vac voltage is present in the electrical box.
b) Check if the AC unit on the Board is correctly connected to one of the 220 Vac terminals in the electrical
box.
c) Check if A1/ A20 inputs are correctly connected with respect to the cabling diagram of the electrical box.
4) No LCD display lit or erratic display behaviour
a) Check serial cable integrity.
b) Check serial cable connections on both the User Interface Board and the Main Board.
c) Check correct and tight insertion of jumpers JU1 and JU2 on the Main Board.
d) Check correct and tight insertion of jumpers TU1 and TD1 on the User Interface Board, main and /or
auxiliary board.
e) Adjust display intensity by rotating trimmer RV1 counter-clockwise (from the back side of the board).
5) No LED H1 blinking light on 1NG or OBI Board
a) Check power supply cable and connection.
b) Check if the power supply voltage is into the specified limits: 24Vac +/- 10%.
c) Check for fuse F1, replace with 1AT/ 250V if blown.
6) Auxiliary board not responding to commands
a) Check if LED H1 on Auxiliary board is blinking, if not go to point (6).
b) Check serial cable integrity.
c) Check serial cable connections on both the Main and the Auxiliary boards.
d) Check that jumpers JU1 and JU2 on the Auxiliary boards are not installed.
e) Check correct and tight insertion of jumpers TU1 and TD1 on the User Interface Board, main and/ or
auxiliary board.
7) Analog Outputs not responding
a) Check Analog Output cables integrity (for short-circuit).
b) Check Analog Output cabling and connections.
c) Check if the power supply voltage is into the specified limits: 24VAC +/- 10%.
d) Check the fuse F1, replace with 1AT/ 250V if blown.
e) Check jumpers and dip switch according to respective wiring diagram.
8) Digital Outputs not responding
a) Check Digital Output cables integrity (no short-circuit, no open-circuit).
b) Check Digital Output cabling and connections.
c) Check if the power supply voltage is into the specified limits: 24VAC +/- 10%.
d) Check the fuse F1, replace with 1AT/ 250V if blown.
9) Serial Communications with Remote Monitoring Control not Functioning
a) Check the serial cable connected on plug-in board IS-485 mounted on the Main Board.
b) Check if the plug-in board is correctly mounted on the Main Board.
c) Check if jumpers X5 and X6 on the plug-in board IS-485 are correctly installed.
d) Check if jumpers X17 and X18 on the GATEWAY board are correctly installed.