Ai1 And Ai2 As Pt100, Pt1000, Ptc And Kty84 Sensor Inputs (Xai, Xao); External Power Supply For The Control Unit (Xpow) - ABB ACS880-11 Hardware Manual

AI1 and AI2 as Pt100, Pt1000, PTC and KTY84 sensor inputs (XAI, XAO)

Three Pt100, Pt1000 and PTC sensors or one KTY84 sensor for motor temperature
measurement can be connected between an analog input and output as shown
below. Leave the other end of the shield unconnected or ground it indirectly via a few
nanofarads high-frequency capacitor, for example, 3.3 nF / 630 V. The shield can also
be grounded directly at both ends if they are in the same ground line with no
significant voltage drop between the end points.
1...3 × Pt100/Pt1000/PTC or 1 × KTY
T T
1) Set the input type to voltage with switch J1 for analog input AI1or with J2 for analog input
AI2. Set the appropriate analog input unit to V (volt) in parameter group 12 Standard AI.
2) Select the excitation mode in parameter group 13 Standard AO.
WARNING! As the inputs pictured above are not insulated according to IEC 60664, the
connection of the motor temperature sensor requires double or reinforced insulation
between motor live parts and the sensor. If the assembly does not fulfill the requirement, the I/O
board terminals must be protected against contact and must not be connected to other
equipment or the temperature sensor must be isolated from the I/O terminals.

External power supply for the control unit (XPOW)

External +24 V (2 A) power supply for the control unit can be connected to terminal
block XPOW. Using an external supply is recommended if
• the control board needs to be kept operational during input power breaks, for
example, due to continuous fieldbus communication
• immediate restart is needed after power breaks (that is, no control board power
up delay is allowed).
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Electrical installation – USA 135
XAI
1)
AIn+
AIn-
XAO
2)
AOn
AGND