Schneider Electric Altivar 58 VW3-A58101 Manual do Utilizador descarregar pdf (Página 61)

VVDED397047US R8/01 ALTIVAR

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58 Keypad Display

08/01 Chapter 2 — Menus

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.

Figure 17: Reference Switching Wiring Diagram

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).

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 ... 56 57 58 59 60 61 62 63 64 65 66 ... 111 112

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Schneider Electric Altivar 58 VW3-A58101 Manual do Utilizador Página 61