Rockwell Automation T6200 Compressor Anti-Surge and Capacity Controller - Manual (Page 18)

Input/Output Circuit Description
2-6
Q1
Active from Figure 2-9
Inhibit from Figure 2-9
Active from Figure 2-9
Voltage to
Primary Control Board
Analog
Current
Output
Converter
50
OHM
From
+25.2V
Current
Current
From
Termination
Panel
Microprocessor
125mA
Voltage to
+25.2V
Converter
Inhibit from Figure 2-9
50
OHM
Microprocessor
125mA
Primary Control Board
Reset
DAC
DAC
Reset
Isolated Discrete Inputs
The T6200-C Controller can be configured for up to 16 isolated discrete inputs. The T6200-D Controller
can be configured for up to 28 isolated discrete inputs in addition to the four internally power discrete
inputs. The resistor, in series with the input, is used to limit the maximum current to less than 6.5
milliamperes. In reference to Figure 2-5, the resistor across the opto-isolator is used to increase the
minimum input current to greater than one milliampere.
The opto-isolator provides electrical isolation between inputs and other circuits. Each input is protected
with fuses. A 100 volt transient absorber is provided on each input terminal to prevent arcing between
conductors on the circuit board. The maximum voltage that can be applied continuously is 38 volts dc or
30 volts ac (rms, sine wave). Discrete input channels 22, 31, and 32 can be used as frequency inputs, with
input frequencies up to 25 kHz. Other discrete inputs can be used as frequency inputs with input
frequencies up to 500 Hz.
Discrete Inputs with Excitation from Controller
The discrete input is similar to the isolated discrete input above, without the isolation. The input is
internally powered. In this configuration a separate internal +24 volt regulator is provided for each dry
contact input. Each voltage regulator has thermal, reverse voltage, and short circuit protection. The
regulator supplies up to five milliamperes.
A contact closure between + and – terminals will activate the input. Refer to Figure 2-6. The internally
powered discrete input represents the standard discrete input jumper selection. The T6200 Controller has
a minimum of four internally powered discrete inputs.
Analog Current
Output
FIGURE 2-4.