Start-Up, Operation, and Maintenance Instructions
Start-Up, Operation, and Maintenance Instructions
Start-Up, Operation, and Maintenance Instructions
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2. Press STATUS .<br />
3. Press COMPRESS .<br />
4. Press SELECT .<br />
5. Set TARGET VFD SPEED to 0%.<br />
Verify that the ACTUAL VFD SPEED shown on the VFD display<br />
is within 0 to 1 Hz.<br />
1. Press the ENTER softkey on the VFD keypad until all<br />
LEDs on the left side of the keypad are illuminated.<br />
NOTE: The value displayed is the frequency at which the<br />
VFD is being comm<strong>and</strong>ed to operate.<br />
2. Adjust VFD parameter P.009 (Input Offset) if outside the<br />
tolerance.<br />
To confirm that the speed signal from the CVC/ICVC<br />
corresponds to the value displayed at the VFD:<br />
3. Verify that the actual speed signal feedback to the chiller<br />
controller is 0% by accessing the COMPRESS screen.<br />
4. Verify ACTUAL SPEED VFD is 0%-1% on CVC/ICVC.<br />
5. Adjust VFD parameter r.002 (Analog Output Offset) if<br />
outside the tolerance.<br />
Set VFD TARGET VFD SPEED to 100%.<br />
1. Press MENU .<br />
2. Press STATUS .<br />
3. Press COMPRESS .<br />
4. Press SELECT .<br />
5. Set TARGET VFD SPEED to 100%.<br />
Verify that the ACTUAL VFD SPEED shown on the VFD display<br />
corresponds to the 50 Hz or 60 Hz setting.<br />
1. Check the ACTUAL VFD SPEED configuration (50 Hz<br />
or 60 Hz) on the ISM_CONF screen.<br />
2. Confirm that the VFD displays the configured line frequency<br />
within ± 1 Hz.<br />
3. Adjust parameter P.010 (Input Gain) if outside the<br />
tolerance.<br />
4. Release the TARGET VFD SPEED so that it can operate<br />
in automatic mode. (Refer to Override <strong>Operation</strong>s section<br />
on page 16.)<br />
VFD CONTROL VERIFICATION (Running)<br />
Preparation<br />
1. Disconnect power to the VFD. Verify that the branch disconnects<br />
or other local disconnects are open <strong>and</strong> properly<br />
tagged out.<br />
2. Connect a voltmeter <strong>and</strong> ampmeter to the line side of the<br />
VFD. Locate meters safely away from the power cables.<br />
3. Reconnect power to the VFD.<br />
4. Measure the voltage on the line side of the drive.<br />
5. Verify it is within 10% of the chiller nameplate voltage.<br />
6. Set up the CVC/ICVC temperature controller per the requirements<br />
of the job.<br />
7. <strong>Start</strong> the chiller <strong>and</strong> verify the rotation of the compressor<br />
just as it starts.<br />
8. Allow the chiller to load up. Verify that the chiller loads<br />
up smoothly.<br />
NOTE: One or two surges may be counted during the first<br />
minute of operation.<br />
Verify That Actual VFD Speed is 100% (±2%)<br />
1. Set the VFD speed to 100%.<br />
2. Verify that the ACTUAL VFD SPEED is 100% (± 2%).<br />
3. If outside the tolerance, adjust r.003 (Output Analog<br />
Gain).<br />
60<br />
4. Leave running for the next test.<br />
ISM Current Calibration Check<br />
1. With the target VFD speed at 100%, load the chiller so<br />
that the CVC/ICVC default display shows 75% to 100%<br />
under the display title AMPS %. A higher load is<br />
preferred.<br />
2. Measure the incoming current with a separate amp meter.<br />
3. Calculate the line side error ratio using the following<br />
equation:<br />
Amp Meter current – Ave. ISM current<br />
Amp Meter current<br />
4. If the Line Side Error Ratio is greater than ± 0.02 adjust<br />
the CVC/ICVC reading by adjusting the ISM CT<br />
ratio.<br />
5. Shut down the chiller.<br />
Change CT Ratio<br />
1. New CT Ratio = Present CT Ratio multiplied by (1+ Line<br />
Side Error Ratio).<br />
To access the ISM_CONF screen:<br />
2. Press ENTER .<br />
3. Press SERVICE .<br />
4. Enter the password 1111.<br />
5. Select ISM (STARTER) CONFIG DATA.<br />
6. Enter password 4444.<br />
7. Select ISM_CONF.<br />
8. Change present CT ratio to new ratio using calculation<br />
above.<br />
9. Press to the SAVE softkey to save changes.<br />
10. Press the EXIT softkey to exit the ISM_CONF screen.<br />
11. Repeat ISM Current Calibration Check.<br />
VFD Current Control Calibration Check<br />
1. With the target VFD speed at 100%, load the chiller so<br />
that the CVC/ICVC default display shows 75% to 100%<br />
under the display title AMPS %. A higher load is<br />
preferred.<br />
2. Access the current on the keypad of the VFD. Determine<br />
the Load Side Current Ratio, using the equation below.<br />
Load Side Current Ratio =<br />
VFD Actual Load Amps<br />
Motor Nameplate Amps<br />
Next, access the VFD Load Factor on the Capacity Control<br />
screen. Calculate the Load Side Error Ratio using the<br />
equation below:<br />
Load Side<br />
Error Ratio<br />
= VFD Load Factor – Load Side Current Ratio<br />
Load Side Current Ratio<br />
3. If the load side error ratio is greater than ± 0.02, adjust the<br />
VFD load factor by changing the VFD current limit on<br />
the Setup 2 screen.<br />
a. The new VFD current limit = old VFD current<br />
limit multiplied by (1+ Load Side Error Ratio).<br />
b. Recheck the VFD Current Control Calibration.<br />
c. Release the Speed Control by accessing the TAR-<br />
GET VFD SPEED control.<br />
Press MENU .<br />
Press STATUS .<br />
Press COMPRESS<br />
.<br />
(Refer to Override <strong>Operation</strong>s section on page 16.)