Carrier AquaEdge 19XR series Start-Up, Operation And Maintenance Instructions Manual Download Page 78

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5. Scroll down and select the ISM_CONF DATA screen to

modify or view the ISM parameters:

6. Press to the

softkey to save changes when exiting

the ISM_CONF screeen.

7. Press the

softkey to and exit the ISM Configura-

tion Screen.

VFD Enable Configuration — To access the parameters:

1. Press .
2. Press .
3. Select EQUIPMENT SERVICE.
4. Scroll down and select SETUP2.
5. Verify the following parameters:

Configure Surge Parameters

1. Press .
2. Press .
3. Select EQUIPMENT SERVICE and OPTIONS to verify

that the parameters in the applicable table below match

the surge prevention parameters for the design conditions

of the chiller. These parameters are found on a label on

the bottom surface of the inside of the chiller control

panel.

VFD CONTROL VERIFICATION (NON-RUNNING) —

In order to verify and, if necessary, tune the speed control sig-

nal of the chiller controller to the VFD (ISM terminal J8-1

labeled 4-20 mA OUT VFD) and the speed feedback signal

from the VFD to the chiller controller (ISM terminal J8-2

labeled VFD HZ), follow the steps below.
Set

TARGET VFD SPEED

to 0%.

1. Press .

2. Press .
3. Press .
4. Press .
5. Set

TARGET VFD SPEED

to 0%.

Verify that the

VFD SPEED REFERENCE

shown on the

VFD display is within 0 to 1 Hz of zero.

1. Press the ENTER softkey on the VFD keypad until all

LEDs on the left side of the keypad are illuminated ex-

cept the Password LED.
NOTE: The value shown in the VFD display is the fre-

quency at which the VFD is being commanded to

operate. This value is called the VFD Speed reference.

2. Verify that the actual speed signal feedback to the chiller

controller is 0% by accessing the ACTUAL VFD SPEED

in the ICVC COMPRESS screen.

3. Verify ACTUAL VFD SPEED is 0% to 1% on the ICVC.

Set TARGET VFD SPEED to 100%.

1. Press .
2. Press .
3. Press .
4. Press .
5. Set

TARGET VFD SPEED

to 100%.

Verify that the VFD Speed Reference shown on the VFD

display corresponds to the 50 or 60 Hz setting (100% TARGET

VFD SPEED).

1. Confirm that the VFD Speed reference displays the TAR-

GET VFD SPEED frequency within ± 1 Hz.

2. Release the TARGET VFD SPEED so that it can operate

in automatic mode. (Refer to Override Operations Sec-

tion on page 23.)

VFD CONTROL VERIFICATION (Running)

Preparation

1. Disconnect power to the VFD. Verify that the branch dis-

connects or other local disconnects are open and properly

tagged out.

2. Connect a voltmeter and ampmeter to the line side of the

VFD. Locate meters safely away from the power cables.

3. Reconnect power to the VFD.
4. Measure the voltage on the line side of the drive.
5. Verify it is within 10% of the chiller nameplate voltage.
6. Set up the ICVC set point per the requirements of the job.
7. Start the chiller and verify the rotation of the compressor

just as it starts.

8. Allow the chiller to load up. Verify that the chiller loads

up smoothly.

NOTE: One or two surges may be counted during the first

minute of operation.
Verify That Actual VFD Speed is 100% (±2%)

1. Set the

TARGET VFD SPEED

in the COMPRESS screen

to 100%.

2. Verify that the

ACTUAL VFD SPEED

is 100% (± 2%).