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2. Press STATUS . 3. Press COMPRESS . 4. Press SELECT . 5. Set TARGET VFD SPEED to 0%. Verify that the ACTUAL VFD SPEED shown on the VFD dis- play is within 0 to 1 Hz. 1. Press the ENTER softkey on the VFD keypad until all LEDs on the left side of the keypad are illuminated. NOTE: The value displayed is the frequency at which the VFD is being commanded to operate. 2. Adjust VFD parameter P.009 (Input Offset) if outside the tolerance. To confirm that the speed signal from the CVC corre- sponds to the value displayed at the VFD: 3. Verify that the actual speed signal feedback to the chiller controller is 0% by accessing the COMPRESS screen. 4. Verify ACTUAL SPEED VFD is 0%-1%. 5. Adjust VFD parameter r.002 (Analog Output Offset) if outside the tolerance. Set VFD TARGET VFD SPEED to 100%. 1. Press MENU . 2. Press STATUS . 3. Press COMPRESS . 4. Press SELECT . 5. Set TARGET VFD SPEED to 100%. Verify that the ACTUAL VFD SPEED shown on the VFD dis- play corresponds to the 50 Hz or 60 Hz setting. 1. Check the ACTUAL VFD SPEED configuration (50 Hz or 60 Hz) on the ISM_CONF screen. 2. Confirm that the VFD displays the configured line fre- quency within ± 1 Hz. 3. Adjust parameter P.010 (Input Gain) if outside the tolerance. 4. Release the TARGET VFD SPEED so that it can operate in automatic mode. (Refer to Override Operations section on page 16.) 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 CVC temperature controller per the require- ments 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 VFD speed to 100%. 2. Verify that the ACTUAL VFD SPEED is 100% (± 2%). 3. If outside the tolerance, adjust r.003 (Output Analog Gain). 4. Leave running for the next test. ISM Current Calibration Check 1. With the target VFD speed at 100%, load the chiller so that the CVC default display shows 75%-100% under the display title AMPS %. A higher load is preferred. 2. Measure the incoming current with a separate amp meter. 3. Calculate the line side error ratio using the following equation: Amp Meter current – Ave. ISM current Amp Meter current 4. If the Line Side Error Ratio is greater than ± 0.02 adjust the CVC reading by adjusting the ISM CT ratio. 5. Shut down the chiller. Change CT Ratio 1. New CT Ratio = Present CT Ratio multiplied by (1+ Line Side Error Ratio). To access the ISM_CONF screen: 2. Press ENTER . 3. Press SERVICE . 4. Enter the password 1111. 5. Select ISM (STARTER) CONFIG DATA. 6. Enter password 4444. 7. Select ISM_CONF. 8. Change present CT ratio to new ratio using calculation above. 9. Press to the SAVE softkey to save changes. 10. Press the EXIT softkey to exit the ISM_Conf screen. 11. Repeat ISM Current Calibration Check. VFD Current Control Calibration Check 1. With the target VFD speed at 100%, load the chiller so that the CVC default display shows 75%-100% under the display title AMPS %. A higher load is preferred. 2. Access the current on the keypad of the VFD. Determine the Load Side Current Ratio, using the equation below. Load Side Current Ratio = VFD Actual Amps Motor Nameplate Amps Next, access the VFD Load Factor on the capacity control algorithm status screen. Calculate the Load Side Error Ratio using the equation below: Load Side = VFD Load Factor – Load Side Current Ratio Error Ratio Load Side Current Ratio 3. If the load side error ratio is greater than ± 0.02, adjust the VFD load factor by changing the VFD current limit on the Service 2 screen. a. The new VFD current limit = old VFD current limit multiplied by (1+ Load Side Error Ratio). b. Recheck the VFD Current Control Calibration. c. Release the Speed Control by accessing the TAR- GET VFD SPEED control. Press MENU . Press STATUS . Press COMPRESS . (Refer to Override Operations section on page 16.) 60PDF Image | 19XR,XRV Hermetic Centrifugal Liquid Chillers 50/60 Hz With PIC II Controls and HFC-134a
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