The ActionI/Q model Q500 is a DIN rail mount, loop-powered isolator, with single, dual or quad (4) channel capability. Each channel accepts a 0-20mA or 4-20mA input, provides up to 1800VDC of isolation and outputs a proportional 0(4)-20mA signal. The Q500 provides signal isolation from input to output and channel to channel.

All ActionI/Q modules feature SnapLoc, plug-in, screw terminals for easy installation and low Mean-Time- To-Repair (MTTR). If desired, two or more modules can slide together and interlock for solid, high density mounting. This is accomplished by removing either the foot, or the adjacent unit's face plate, for right-hand side or left-hand side mounting, respectively. The module to be attached will easily slide on to the side of the mounted unit.

Application

Loop-powered isolators are used to isolate process signals transmitted between field instrumentation, Programmable Logic Controllers (PLC), Distributed Control Systems (DCS) and Data Acquisition Systems (DAS). Outputs from these systems can also drive one or more isolator channels of the Q500. Field devices such as flow, level or temperature transmitters may also drive a Q500 isolator channel.

The 1800VDC isolation capability of the Q500 prevents ground loops from causing errors in 4-20mA current signals and may reduce susceptibility to Radio Frequency Interference (RFI). Isolation also provides protection from high voltages and current spikes which may damage expensive Supervisory Control And Data Acquisition (SCADA) equipment, such as a PLC or DCS.

Operation

The ActionI/Q model Q500 operates as a looppowered isolator, with each channel deriving its power from the input loop current, 0(4)- 20mA. The effective load of a Q500 isolator channel on a loop is 300W plus the output load resistance. For example, if the load on an output of the Q500 is 500W, then the current loop connected to the input of the Q500 would need to drive 300W plus 500W (i.e. 800W) at a maximum current of 20mA, or 800W x 20mA which equals 16.0V.

Input 

• Ranges: 0(4) to 20mA, 30VDC max, each channel 
• Voltage Drop: 6V (300W), plus output load
  

Output 

• Range: 0 (4) to 20mA, 
• Drive: 10V or 500W maximum @ 20mA, 100W minimum
  

Output Accuracy   

Better than ± 0.2% of full-scale, including linearity, repeatability, maximum

Linearity     

0.1% of span typical, from 4 to 20mA at 250W load

Stability     

±0.02%/oC of span maximum for full-scale and zero

Load Regulation     

±0.1% of span, typical per 10W change

Common Mode Rejection Ratio   

> 100dB (DC to 60Hz)

Isolation     

1800V DC, input to output and channel to channel.