Section 1
General Information
Receiving & Installation 3-5
MN718
Analog Inputs and Outputs
Analog Inputs
Two analog inputs are available: analog input #1 (J1-1 and J1-2) and analog input #2
(J1-4 and J1-5) as shown in Figure 3-28. Either analog input #1 or #2 may be grounded
provided the common mode range is not exceeded. Either analog input may be selected
in the Level 1 INPUT block, Command Select parameter value. Analog input #1 is
selected if parameter value “Potentiometer” is selected. Analog input #2 is selected if
parameter value “+/–10Volts, +/–5 Volts or 4-20mA” is selected. Figure 3-29 shows the
equivalent circuits of the Analog Inputs.
Figure 3-28 Analog Inputs and Outputs
Analog Ground
Analog Input 1
Pot Reference
Analog Input +2
Analog Input -2
Analog Output 1
Analog Output 2
Command Pot
or
0-10VDC
±
5VDC,
±
10VDC
or 4-20 mA Input
5K
W
Programmable 0-5VDC
(Factory Preset: Speed)
Programmable 0-5VDC
(Factory Preset: Current)
Terminal Tightening Torque = 7 Lb-in (0.8 Nm).
Analog Input #1
The single ended analog input #1 is used when the controller is set to Standard 3 Wire,
Fan Pump 2 or 3 Wire, Process, or Bipolar Control (not Keypad or 15 Speed 2 Wire
modes). When using a potentiometer as the speed command, process feedback or
setpoint source, the Level 1 Input block COMMAND SELECT parameter must be set to
“POTENTIOMETER”.
1.
Connect the wires from the 5K
W
pot as shown in Figure 3-28. One end of the
pot is connected to J1-1 (analog ground) and the other end is connected to J1-3
(reference voltage).
2.
Connect the wiper of the pot to J1-2. The voltage across terminals J1-1 and
J1-2 is the speed command input.
3.
A 0-10VDC speed command signal may be connected across J1-1 and J1-2
instead of a 5K
W
pot.
Содержание 18H Series
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Страница 144: ...Appendix C Appendix C 1 MN718 ...