Analog Inputs - Baldor 23H Series Installation & Operating Manual

Analog Inputs

Analog Input #1
(Single Ended)
Analog Input #2
(Differential)
3-24 Receiving & Installation
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 may be selected in the
Level 1 INPUT block, Command Select parameter value. Analog input #1 is selected if
the parameter value is "Potentiometer". Analog input #2 is selected if the parameter
value is "+/-10Volts, +/-5 Volts or 4-20mA". Figure 3-29 shows the equivalent circuits of
the Analog Inputs.
Figure 3-28 Analog Inputs
Command Pot or
0-10VDC
±5VDC, ±10VDC or 4-20 mA Input
See recommended terminal tightening torques in Section 7.
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".
Note: A potentiometer value of 5kW to 10kW, 0.5 watt may be used.
Parameter Selection
The single ended analog input #1 can be used in one of three ways:
1. Speed or Torque command (Level 1 Input block, Command Select=Potentiometer).
2. Process Feedback (Level 2 Process Control block, Process Feedback=Potentiometer).
3. Setpoint Source (Level 2 Process Control block, Setpoint Source=Potentiometer).
When using Analog Input #1, the respective parameter must be set to
"POTENTIOMETER".
Analog input #2 accepts a differential command ±5VDC, ±10VDC or 4-20 mA.
If pin J1-4 is positive with respect to pin 5, the motor will rotate in the forward direction.
If pin J1-4 is negative with respect to pin 5, the motor will rotate in the reverse direction.
JP1 must be set for voltage or current operation as required. Analog Input #2 can be
connected for single ended operation by grounding either of the inputs, provided the
common mode voltage range is not exceeded.
Note: The common mode voltage can be measured with a voltmeter. Apply the
maximum command voltage to analog input 2 (J1-4, 5). Measure the AC and
DC voltage across J1-1 to J1-4. Add the AC and DC readings together.
Measure the AC and DC voltage from J1-1 to J1-5. Add the AC and DC
readings together.
If either of these measurement totals exceeds a total of ±15 volts, then the
common mode voltage range has been exceeded. To correct this condition,
either change the command source or isolate the command signal with a
signal isolator.
J1
Analog GND
1
Analog Input 1
2
Pot Reference
3
5KW
Analog Input +2
4
Analog Input -2
5
Analog Input 1
Analog Input 2
MN723