Emerson Digistart CS Guia Del Usuario página 8

4. 4-20 mA Analog Output
4.1 Overview
The Remote Keypad has a 4-20 mA analog output for monitoring motor current. The 4-20 mA output is available on terminals B10, B11.
The analog output signal spans from 4 mA when the motor current is zero (when the soft starter is not running) to 20 mA when the
motor current is 125% of the Motor FLC setting in the Remote Keypad (Pr 6).
4.2 Calibration
The Remote Keypad Motor FLC parameter (Pr 6) must be adjusted to match the Motor FLC setting in the soft starter.
The lower end of the analog output signal can be calibrated using the Remote Keypad Analog Output 4 mA Offset parameter (Pr 7).
This is set to give a 4 mA output signal when the motor current is zero.
The 4-20 mA analog output has an accuracy of ±10%. It is not designed for process signal control and should only be used for motor
current monitoring and metering.
4.3 Programming
When the 4-20 mA output is being used, the Remote Keypad's Motor FLC and Analog Output 4 mA Offset parameters (Pr 6 and 7) must
be set appropriately (see Calibration). Programming can only be carried out while the soft starter is not running.
4.3.1 Programming procedure
1. To enter Programming Mode, hold down the Data/Prog pushbutton for four seconds. The default value of the first parameter will
be displayed.
2. Use the Data/Prog pushbutton to advance to the next parameter.
3. Use the Stop and Reset pushbuttons to adjust parameter values.
Programming Mode closes when the Data/Prog pushbutton is pressed after Pr 9.
There is a 20 second timeout when the Remote Keypad is in Programming Mode. Programming Mode will automatically
NOTE
close if no input is registered for 20 seconds. Any changes already made will be saved.
4.3.2 Programmable parameters
Table 4-1 Programmable parameters
Parameter
Number
1 RS485 Network Baud Rate
2 RS485 Network Satellite Address
3 RS485 Network Timeout
4 RS485 Network Protocol
5 Modbus Protocol Parity
6 Motor FLC (A)
7 Analog Output
4 mA Offset (%)
8 Start, Stop, Quick Stop function
disable
Current ÷ 10
9
1
Pr 1 to 5 only apply when the Remote Keypad is being used as a Modbus or AP ASCII network gateway. See the Modbus Module
User Guide for details.
2
Remote Keypad Reset pushbutton is always enabled.
8
Description
1
1
1
1
1
www.controltechniques.com
Default
Setting
4
20
0
1
0
10 1 to 2868
100 80 to 120
0 0 = Remote Keypad start, stop, quick stop function enabled.
1 = Remote Keypad start, stop, quick stop function enabled.
2 = Remote Keypad start, stop, quick stop function disabled.
3 = Remote Keypad start, stop, quick stop function disabled.
0 0 = off (required for Digistart CS)
1 = on (not suitable for Digistart CS)
Adjustable Range
Remote Keypad User Guide
2
2
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