42
Wiring and Electrical Connections
• General warnings
Before connecting cables make sure the power supply complies with the instrument’s requirements.
Separate the probe cables from the power supply cables, from the outputs and the power connections.
Do not exceed the maximum current allowed on each relay 5A resistive, in case of heavier loads use a suitable external relay.
• Wiring connections
24Vac/dc supply: use terminals 1-2
• Always use a class 2 transformer with minimum power 5VA such as TF5.
• Terminals [21-22], [23-24], [25.26], [27-28] are provided with JST 2 PINS connectors, they require the CABCJ15 (1,5mt) or
CABCJ30 (3mt) wiring cables
• Probes connection
If using terminal ends be sure there are no bear parts which could cause short circuiting or introduce noise disturbance at high
frequencies. To minimize the induced disturbances use shielded cables with the shield connected to earth.
Pressure probe (4 - 20 mA): respect the polarity. If using terminal ends be sure there are no bear parts which could cause short
circuiting or introduce noise disturbance at high frequencies. To minimize the induced disturbances use shielded cables with the
shield connected to earth.
Temperature probe: it is recommended to place the temperature probe away from direct air streams to correctly measure the
temperature.
Low voltage side (14PINs connector): Keep the cables away from the power cables. Use shielded cable to lengthen the cables.
NOTE 1: The PIN 4 is the common line for the temperature probes
NOTE 2: The PIN 3 gives a 12Vdc supply for the 4-20mA pressure transducers
PP07 PP11, PP30, PP50 4÷20mA pressure transducers respect the polarity.
Suction (P1C = Cur)
Brown (+) to terminal 6 ; white (-) to terminal 5
Condenser (P2C = Cur)
Brown (+) to terminal 6 ; white (-) to terminal 7
35 7
46 8
12V
40mA
§
Pb1Pb2
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