Schneider Electric ALTIVAR 58 TRX Guia de Instalação descarregar pdf (Página 70)

Chapter 2—Menus VVDED397047USR6/03

5—I/O Menu 06/2003

Reference Switching (Auto/Manual)

Switching between two references (at AI1 and AI2) by a logic input

command. When the logic input is closed (set to state 1), AI1 is

enabled. This function automatically assigns AI2 to Speed

Reference 2.

Freewheel Stop (Coast to Stop) / Run Permissive

A logic input can be assigned to the Freewheel Stop / Run Permissive

(NST) function. The drive controller will not run until the logic input is

closed. Opening the logic input assigned to the function (setting it to

state 0) causes the drive controller to stop applying power to the

motor and the motor to coast to a stop. When the logic input is open,

NST is displayed in the Drive state screen on the keypad display to

indicate that a freewheel stop has been requested. The drive

controller will not run until the logic input is closed. This can be used

with the Forced Local function for drive controllers on communication

networks.

A freewheel stop can be used with a stop command and by setting

the FFt parameter. When a stop command is given and the frequency

drops below the frequency set with the FFt parameter, the drive

controller will freewheel stop.

DC Injection Braking

DC injection braking can be activated at the end of each stop cycle

(Adc = Yes) or DC injection braking can be obtained by closing the

logic input assigned to the DC Injection Braking function (setting it to

state 1).

Figure 17: Reference Switching Wiring Diagram

COM

0–20 mA

4–20 mA

+10AI 1LI x + 24 AI 2

LIx contact open, reference = AI2

LIx contact closed, reference = AI1

- +

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 125 126

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Schneider Electric ALTIVAR 58 TRX Guia de Instalação Página 70