40
Table 6 — Protective Safety Limits and Control Settings
MONITORED PARAMETER
ALARM/
ALERT
LIMIT COMMENTS
Temperature Sensors Out of Range 260-271,
140,141
.06 > Voltage Ratio > .98 or – 40 F >
Temperature>245 F for 3 seconds
Preset Alarm, Voltage Ratio=Input Voltage/
Voltage Reference(5 Volts)
Pressure Transducers Out of Range 260-271 .06 > Voltage Ratio > .98 for 3 seconds Preset Alarm, Voltage Ratio=Input Voltage/
Voltage Reference(5 Volts)
High Compressor Discharge Temperature 231 COMP DISCHARGE TEMP > 220 F
(104.4 C)
Preset Alarm, Configure COMP DISCHARGE
ALERT in SETUP1 screen
167 COMP DISCHARGE TEMP > COMP DISCHARGE
ALERT
Configure COMP DISCHARGE ALERT in SETUP1
screen
103 COMP DISCHARGE TEMP > COMP DISCHARGE
ALERT – 10 F (5.6 C)
Prestart Alert, Configure COMP DISCHARGE
ALERT in SETUP1 screen
High Motor Temperature 233 COMP MOTOR WINDING TEMP > 220 F
(104 C)
Preset Alarm, Configure COMP MOTOR TEMP
OVERRIDE in SETUP1 screen
102 COMP MOTOR WINDING TEMP > COMP MOTOR
TEMP OVERRIDE – 10 F (5.6 C)
Prestart Alert, Configure COMP MOTOR TEMP
OVERRIDE in SETUP1 screen
Compressor Thrust Bearing Temperature 101 COMP THRUST BRG TEMP > COMP THRUST
BRG ALERT – 10 F (5.6 C)
Preset Alert, Configure COMP THRUST BRG
ALERT in SETUP1 screen
234 COMP THRUST BRG TEMP > 185 F
(85 C)
Preset Alarm
Low Evaporator Temperature
(Freeze Protection)
243 Chiller in RECYCLE SHUTDOWN and EVAP
TEMP< EVAP REFRIG TRIPPOINT + 1 F
Preset Alarm, configure EVAP REFRIG
TRIPPOINT in SETUP1 screen
232 EVAP REFRIG TEMP < 33 F (water) and
EVAP APPROACH > EVAP APPROACH ALERT
Preset Alarm, Configure EVAP APPROACH
ALERT in SETUP1 screen
0° F (–17.8 C) < EVAP REFRIG TEMP
< 40 F (4.4 C) (brine) and EVAP APPROACH
> EVAP APPROACH ALERT
Configure EVAP REFRIG TRIP POINT and
CHILLED MEDIUM in SETUP1 screen
104 EVAPORATOR REFRIG TEMP < 33 F
+ REFRIG OVERRIDE DELTA T (water)
Prestart Alert, Configure REFRIG OVERRIDE
DELTA T in SETUP1 screen
EVAPORATOR REFRIG TEMP < EVAP REFRIG
TRIPPOINT (brine)
Prestart Alert, Configure EVAP REFRIG TRIP-
POINT and CHILLED MEDIUM in SETUP1 screen
Transducer Voltage Fault 239 5.5 VDC < Voltage Reference < 4.5 VDC Preset Alarm
High Condenser Pressure — Control 235 CONDENSER PRESSURE > 165 PSI Preset Alarm, Configure COND PRESS
OVERRIDE in SETUP1 screen
Switch 207 High Pressure Switch Open (165 ± 5 PSIG) &
VFD START = YES
Preset Alarm, Switch closes at 110 ± – PSIG
Prestart 106 CONDENSER PRESSURE > COND PRESS
OVERRIDE – 20 PSI
Prestart Alert, Configure COND PRESS
OVERRIDE in SETUP1 screen
CONDENSER PRESSURE > 145 PSI Prestart Alert
Low Condenser Pressure
(Freeze Protection)
244 Chiller in PUMPDOWN mode and CONDENSER
REFRIG TEMP < CONDENSER FREEZE POINT
Preset Alarm, Configure CONDENSER FREEZE
POINT in SETUP1 screen.
154 Energizes condenser pump relay if CONDENSER
REFRIG TEMP < CONDENSER FREEZE POINT.
Deenergizes condenser pump relay when
CONDENSER REFRIG TEMP > CONDENSER
FREEZE POINT + 5° F (2.8° C) and ENTERING
COND LIQUID > CONDENSER FREEZE POINT
Configure CONDENSER FREEZE POINT in
SETUP1 screen
Oil — Low Pressure 228 OIL PRESSURE DELTA P < 13 PSID and
VFD START = TRUE
Preset Alarm
Low Pressure OIL PRESSURE DELTA P < 18 PSID and startup
complete after OIL PRESS VERIFY TIME elapsed
Preset Alarm, Configure OIL PRESS VERIFY
TIME in SETUP1 screen
Low Pressure 142 OIL PRESSURE DELTA P < 18 PSID and startup
complete
Preset Alert
Pressure Sensor Fault 227 OIL PRESSURE DELTA P > 4 PSI immediately
before oil pump turned on
Preset Alarm
Low Temperature 105 OIL SUMP TEMP < 150 F and OIL SUMP TEMP <
EVAP REFRIG TEMP + 50 F (27.8 C)
Prestart Alert
Line Voltage — High 211/145 Line voltage > approximately 528 V, limits are
calculated by VFD
Preset Alarm/Alert
High 108 PERCENT LINE VOLTAGE > Overvoltage
threshold
Preset Prestart Alert
Low 212/146 DC BUS VOLTAGE < approximately 408 V,
limits are calculated by a VFD
Preset Alarm/Alert
Low 107 PERCENT LINE VOLTAGE < Undervoltage
threshold
Preset Prestart Alert
Imbalance 216 LINE VOLTAGE IMBALANCE > LINE VOLTAGE
% IMBALANCE
Configure LINE VOLTAGE % IMBALANCE and
LINE VOLT IMBALANCE TIME in VFD CONF
screen
Line Current — Single Cycle Dropout 210/144 Line Voltage on 2 Phases < 50% for 1 Cycle Preset Alarm
Imbalance 209/143 LINE CURRENT IMBALANCE>LINE CURRENT
% IMBALANCE
Configure LINE CURRENT % IMBALANCE and
LINE CURRENT IMBALANCE TIME in
VFD_CONF screen
Power — Line Frequency Out of Range 222 47 Hz < LINE FREQUENCY < 63 Hz Preset Alarm
ICVC Power on Reset 214/148 Loss of control power to ICVC for excessive time
period
Preset Alarm
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