ABB ACS355 series Panduan Tambahan - Halaman 8

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INSTALLATION

WIRING SCHEMATICS

NOTE: Pre-set speeds override any

Frequency (Speed) inputs.

Use switches across terminals

9-14 and 9-15 on the VFD.

Install Leader-Follower connection

wiring if desired to operate 2nd

VFD at the same speeds.

EXAMPLE OF OPERATION OF 2 VFDS BY A CO2 CONTROLLER.

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ABB VFD SUPPLEMENTAL MANUAL

ABB VARIABLE FREQUENCY DRIVES

USING VFD PRESETS FOR THE SPEED SIGNALS

The VFD can be programmed with 3 pre-set speeds. Contact switches can then be used to direct the VFD

to operate at one of those speeds. See ABB manuals for additional options. Leader-follower wiring can also

be used to make a second VFD operate at the same speed as the ﬁ rst VFD.

USE OF 2 SWITCHES TO COMMAND THE VFD

TO OPERATE AT ANY OF 3 PRE-SET SPEEDS.

USE WITH A CO2 CONTROLLER

The example below corresponds to the example in the section "Scaling and Response to Analog Inputs".

The scaling parameter settings for the FA VFD in your application are likely to be different.

1.800.627.4499

If both VFDs are to run at the same speed, no scaling

parameters need be applied to the EA VFD in this example

since it is controlled as a "Follower".

If it is desired that the VFDs should shut off when CO2

levels drop below a setpoint, connect the Normally

Open contacts of the CO2 controller (terminals 3 & 4)

to terminals 9 & 12 of the FA VFD. Adjust the operating

parameters of the CO2 controller to set the relay setpoint.