Specifications

77
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.
SOFTWARE VERSION 9 AND LOWER
SOFTWARE VERSION 10 AND HIGHER
VFD CONTROL VERIFICATION (Non-Running) — In
order to verify and, if necessary, tune the speed control signal
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. Adjust VFD parameter P.009 (Input offset) if outside the
tolerance. The VFD will declare an "Aln" Alarm if P.009
is too small.
3. Verify that the actual speed signal feedback to the chiller
controller is 0% by accessing the ACTUAL VFD SPEED
in the ICVC COMPRESS screen.
4. Verify ACTUAL VFD SPEED is 0% to 1% on the ICVC.
5. Adjust VFD parameter r.002 (Analog Output Offset) if
outside the tolerance. A "C" will be displayed next to AC-
TUAL VFD SPEED if r.002 is too small. The "C" stands
for communications fault.
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. Adjust parameter P.010 (input Gain) if outside the toler-
ance.
3. Release the TARGET VFD SPEED so that it can operate
in automatic mode. (Refer to Override Operations Sec-
tion on page 19.)
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%).
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 ICVC default display shows 75% to 100% un-
der the display title AMPS %. A higher load is preferred.
2. Measure the incoming current of all three input phases
with a separate true RMS amp meter.
3. Calculate an average Amp Meter Current of the three in-
put phases.
VFD OPTION ENABLED
VFD CURRENT LIMIT MOTOR FLA from "Load Side" section
of the VFD enclosure nameplate
DESCRIPTION SETTINGS
SURGE/HGBP
DELTA T1
Surge parameter label
SURGE/HGBP
DELTA P1
Surge parameter label
SURGE/HGBP
DELTA T2
Surge parameter label
SURGE/HGBP
DELTA P2
Surge parameter label
DESCRIPTION SETTINGS
SURGE/HGBP
DELTA TSMIN
Surge parameter label
SURGE/HGBP
IGVMIN
Surge parameter label
SURGE/HGBP
DELTA TSMAX
Surge parameter label
SURGE/HGBP
IGVMAX
Surge parameter label
SURGE LINE
SHAPE FACTOR
Surge parameter label
SAVE
EXIT
MENU
SERVICE
MENU
SERVICE
MENU
STATUS
COMPRESS
SELECT
MENU
STATUS
COMPRESS
SELECT