Surge Prevention Configurations - Carrier AquaEdge 19XRV series Operation, Maintenance And Installation 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.
WARNING
It is the operator's responsibility to distribute access to the
ICVC passwords. Carrier is not responsible for unautho-
rized access violations within the operator's organization.
Failure to observe this warning could result in bodily
injury.
SURGE PREVENTION CONFIGURATIONS —
Prevention Configurations are defined as follows:
• Surge/HGBP Delta Tsmin is the minimum difference
between cooler and condenser saturation temperatures.
(See Fig. 41.)
• Surge/HGBP IGVmin is the lowest position of the guide
vanes that affects Surge prevention. This is not likely to
require adjustment at the jobsite other than to ensure that
it matches the value supplied with the machine selection.
These values produce the minimum load point of the Surge
Prevention line:
• Surge/HGBP Delta Tsmax is the maximum difference
between cooler and condenser saturation temperatures.
(See Fig. 42.)
• Surge/HGBP IGVmax is the highest position of the
guide vanes that affects Surge prevention. This is not
likely to require adjustment at the jobsite other than to
ensure that it matches the value supplied with the
machine selection.
NOTE: The preceding two values produce the full load point
of the surge prevention line.
• Surge Line Shape Factor determines the curvature of the
line mainly in the low load zone. (See Fig. 43.)
• Surge Line Speed Factor determines how much the surge
line moves to accommodate lower compressor speed. As
compressor speed drops the ΔT values on the surge pre-
vention line decrease. Increasing the Speed Factor causes
Surge Prevention to activate sooner as the compressor
speed drops. (See Fig. 44.)
• Surge Line High Offset determines the ΔT increase
beyond the surge prevention line where the high stage of
Surge Prevention takes effect. The high stage produces
larger RPM increase steps. This is not likely to require
adjustment at the jobsite other than to ensure that it
matches the value supplied with the machine selection
• Surge/HGBP Deadband controls the amount the ACTIVE
DELTA TSAT must drop below the Surge Prevention to
de-activate Surge Prevention.
40
35
30
25
20
15
10
5
0
0 10 20
Fig. 41 — Effect of SURGE/HGBP DELTA TSMIN
45
40
35
Surge
30
25
20
15
10
5
0
0 10
Fig. 42 — Effect of SURGE/HGBP DELTA TSMAX
75
30 40 50 60 70 80 90
GV_POS
on Surge Prevention
20 30 40 50 60 70 80 90
GV_POS
on Surge Prevention
Tsmin=30
Tsmin=40
Tsmin=50
100 110
a19-1959
Tsmax=60
Tsmax=70
Tsmax=80
100 110
a19-1960