circuit; each channel can trigger TRIAC or a pair of inverse parallel SCR with current of 5-500A)
K5 “Burn-proof” single-phase thyristor phase-shift trigger output module (trigger one loop of
TRIAC or a pair of inverse parallel SCR with current of 5-500A), suitable for 200～240VAC power
supply.
X3 0～20/4～20mA linear current output module.(Sharing internal 12VDC power)
X5 0～20/4～20mA linear current output module.(With its own isolated power)
S Photoelectric isolated RS485 communication module(sharing internal 12VDC power)
S4 Photoelectric isolated RS485 communication module(with its own isolated power)
V5/V10/V12/V24 Isolated 5V, 10V, 12V or 24V DC output with maximum current 50mA.
U5 Non isolated 5V/25mA voltage output, giving power supply for valve.
I2 on/off switch or frequency signal input, included 12 VDC power for external sensor.
I4 4-20mA/0-20mA analogue input interface, providing a 24VDC/24mA power supply for a
two-wire transmitter.
1.3 MODULES
AI-518/518P series instruments have five sockets for modules .By installing different modules, the controller
expands its functions and output types.
Multiple function Input/Output (MIO): accepts input signal from 2-wire transmitter or 4-20mA signal by
installing I4 (current input) module. If I2 (on-off signal input) module is installed, the instrument can
switch between setpoint SV1 and SV2 by external trigger. If add I2 moudle, AI-518P will be albe to
on/off control programming.With K3, it’s able to give three phase SCR contact zero crossing control
output.
Main output (OUTP): commonly used as control output such as on-off control(CtrL=0), if oP1.A=1,2,4,
then OUTP will be transmittion output for AI-518, programmalbe given output for AI-518P.
Alarm (ALM): commonly used as alarm output. It supports 1 normal open + normal close relay output
(AL1) by installing L1 or L2 module. It supports 2 normal open relay outputs (AL1+AL2) by installing L5
module.
Auxiliary output (AUX): In a heating/refrigerating dual output system, module X3, X5, L1, L4, G, W1,
W2 can be installed as the second control output. It can also output alarm by installing L1, L2 or L5
module, or used for communicating with computer by installing R module (RS232C interface).
Communication Interface (COMM): Module S or S4 can be installed in for communicating with computer
(RS485 communication interface).
Voltage output module: The voltage output modules like V24, \/10 or V12 are often used for supplying
power for external transducer or feedback resistance of transmitter. These modules can be installed in
any socket. To standardize the wiring, it is recommended to be installed in the first idle socket in the
order of MIO, AUX followed by COMM.
Modules installation: usually all modules will be plugged in before sending product to customers.But if
damage happens, users can plug in or take off or change modules by themselves. Re-setting
parameters is needed sometimes, please refer to parameters specially oP,CF.
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