Carrier XRV Dokumentacja Pobierz pdf (Strona 69)

VERIFY VFD CONFIGURATION AND CHANGE

PARAMETERS IF NECESSARY (Fig. 35)

VFD CHILLER FIELD SET UP AND VERIFICATION

Label Locations

— Verify that the following labels have been

installed properly and match the chiller requisition:

• Surge Parameters — Located inside the control panel. See

Fig. 10.

• Refrigeration Machine Nameplate — Located on the right

side of the control panel. See Fig. 10.

• External Machine Electrical Data Nameplate — Located on

the right side of the VFD as viewed from its front. See

Fig. 35.

• Internal Machine Electrical Data Nameplate — Located on

the inside of the left VFD enclosure door. See Fig. 35.

• Record all nameplate information on the Initial Start-up

Checklist at the end of this manual.

Check VFD_CONFIG TABLE

— Enter the VFD_CONF

screen on the ICVC by entering the following screen

sequence when the chiller is not running:

•MENU

•SERVICE

• Password (default 1111)

•VFD CONFIG DATA

• Password (default 4444)

• VFD_CONF

Confirm that the following parameters in the

VFD_CONF screen match the values on the Internal

Machine Electrical Data Nameplate:

• Motor Nameplate Voltage — Voltage required to run at

motor rating.

• Compressor 100% Speed — Compressor speed required to

run at chiller design point.

• Rated Line Voltage — Nominal line voltage selected for the

job site.

• Rated Line Amps — Line current required for the chiller to

run at the design point.

• Rated Line Kilowatts — Line power required for the chiller

to run at the design point.

• Motor Rated Load kW — Power consumed by the motor

when running at the chiller design point.

• Motor Rated Load Amps — Motor current required for the

chiller to run at the design point.

• Motor Nameplate Amps — Motor nameplate full load

amps.

• Motor Nameplate RPM — Rated speed of the motor when

running at motor nameplate rated frequency, rated current,

and rated voltage.

• Motor Nameplate kW — Motor nameplate rated power.

• Inverter PWM Frequency — Sets the carrier frequency for

the pulse width modulation output.

NOTE: Other parameters on these screens are normally left at

the default settings; however, they may be changed by the

operator as required. The voltage and current imbalance level

and imbalance persistence time on the VFD_CONF table can

be adjusted to increase or decrease the sensitivity of these fault

conditions. Increasing time or persistence decreases sensitivity.

Decreasing time or persistence increases sensitivity to the fault

condition.

NOTE: Some of the parameters can be changed only when the

drive is stopped.

HAND CALCULATE VARIABLE PRIMARY FLOW

(VPF) SURGE PREVENTION CONFIGURATIONS —

The configurations entered determine the Surge Prevention line

that the controls use to raise the speed of the VFD if the com-

pressor operating point nears this line.

Calculate ΔP maximum and ΔP minimum using 2 point

method shown in sections below. If the original selection con-

figuration points are available, use ΔP1 and ΔP4 from that se-

lection as ΔP maximum and ΔP minimum. If the original selec-

tion configuration was for a 2 point surge line, use ΔP1 and

ΔP2.

Use the default values for the following configurations:

• Surge / HGBP IGV min. = 5.0

• Surge / HGBP IGV max = 100.0

• Surge Line Shape Factor = -0.040

• Surge Line Speed Factor = 1.85

• Surge Line High Offset = 1.0

• Surge/ HGBP Deadband = 1

Calculate Maximum Load

— To calculate the maximum load

points, use the design load condition data. If the chiller full load

cooler temperature difference is more than 15 F (8.3 C),

estimate the refrigerant suction and condensing temperatures at

this difference. Use the proper saturated pressure and tempera-

ture for the particular refrigerant used.

Suction Temperature:

42 F (5.6 C) = 37 psig (255 kPa) saturated

refrigerant pressure (HFC-134a)

Condensing Temperature:

98 F (36.7 C) = 120 psig (1827 kPa) saturated

refrigerant pressure (HFC-134a)

IMPORTANT: The VFD controller has been factory con-

figured for use and communications to the International

Chiller Visual Controller (ICVC). Some parameters are

specific to the chiller configuration and will need to be ver-

ified prior to operation. All command functions must be

initiated from the ICVC.

Fig. 35 — Machine Electrical Data Nameplate

INTERNAL EXTERNAL

a19-1626

WARNING

It is the operator’s responsibility to distribute access to the

ICVC passwords. Carrier is not responsible for unauthor-

ized access violations within the operator’s organization.

Failure to observe this warning could result in bodily

injury.

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