ABB RCNA-01 Instrukcja Użytkownika Pobierz pdf (Strona 312)

100

101

308 Parameter listing and descriptions

ACH550-01 User's Manual

8119 AUTOCHNG LEVEL 0.0…100.0%

Sets an upper limit, as a percentage of output capacity, for the

autochange logic. When the output from the PID/PFA control block

exceeds this limit, autochange is prevented. For example, use this

parameter to deny autochange when the Pump-Fan system is operating

near maximum capacity.

Autochange overview

The purpose of the autochange operation is to equalise duty time

between multiple motors used in a system. At each autochange

operation:

• A different motor takes a turn connected to the ACH550 output – the

speed regulated motor.

• The starting order of the other motors rotates.

The Autochange function requires:

• external switchgear for changing the drive’s output power

connections.

• parameter 8120

INTERLOCKS = value > 0.

Autochange is performed when:

• The running time since the previous autochange reaches the time set

by parameter 8118

AUTOCHNG INTERV.

• the PFA input is below the level set by parameter 8119

AUTOCHNG

LEVEL.

Code Description Range

1 2 ... 307 308 309 310 311 312 313 314 315 316 317 ... 473 474

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