5.5 vdc
165 ± 5 psig (1138 ± 34 kPa), reset at 110 ± 7 psig (758 ± 48 kPa)
165 psig (1138 kPa)
Cutout <15 psid (103 kPad) Alert <18 psid (124 kPad)
>150% for one second or >115% for ten seconds
<85% for ten seconds or ≤80 for 5 seconds or <75% for one second
<50% for one cycle (if enabled)
>110% for 30 seconds
<15% with compressor running
>15% with compressor off
150% RLA for 20 sec.
>100% RLA for 45 sec.
>100% RLA for 10 sec.
If IM contact open >20 sec.
Energizes condenser pump relay if
condenser refrigerant temperature or condenser entering water temperature is below the configured condenser freeze point temperature. Deenergizes when the temperature is 5 F (3 C) above con- denser freeze point temperature.
Minimum value calculated based on operating conditions and then compared to actual superheat.
Detects discharge pulses caused by incorrect diffuser position.
MONITORED PARAMETER
TEMPERATURE SENSORS OUT OF RANGE
PRESSURE TRANSDUCERS OUT OF RANGE
COMPRESSOR DISCHARGE TEMPERATURE
MOTOR WINDING TEMPERATURE BEARING TEMPERATURE
EVAPORATOR REFRIGERANT TEMPERATURE
TRANSDUCER VOLTAGE CONDENSER PRESSURE — SWITCH
APPLICABLE COMMENTS
Must be outside range for 2 seconds
Must be outside range for 3 seconds. Ratio = Input Voltage ÷ Voltage Reference
Preset, alert setting configurable
Preset, alert setting configurable Preset, alert setting configurable
Preset, configurable chilled medium for water (SETUP1 table)
Configure chilled medium for brine (SETUP1 table). Adjust EVAP REFRIG TRIPPOINT for proper cutout
Preset Preset
Preset Preset
Preset, based on transformed line voltage to ISM. Also monitored at CVC and CCM power input.
Default is disabled. Preset
Preset
Preset
For chillers with reduced voltage mechanical and solid-state starters
For chillers with full voltage starters (Configures on ISM_CONF table).
Reduced voltage starters only
CONDENSER FREEZE POINT configured in SETUP1 table with a default setting of 34 F (1 C).
Calculated minimum required superheat and actual superheat are shown on OVERRIDE screen.
Preset, no calibration needed.
is remedied by the operator. Use CVC display and alarm shut- down record sheet (CL-14) to record all values from default screen freeze.
Knowledge of the operating state of the chiller at the time an alarm occurs is useful when troubleshooting. Additional chiller information can be viewed on the status screens and the ISM_HIST screen. Troubleshooting information is recorded in the ALARM HISTORY table, which can be accessed from the SERVICE menu.
To determine what caused the alarm, the operator should read both the primary and secondary default screen messages, as well as the alarm history. The primary message indicates the most recent alarm condition. The secondary message gives more detail on the alarm condition. Since there may be more than one alarm condition, another alarm message may appear after the first condition is cleared. Check the ALARM HISTO- RY screen for additional help in determining the reasons for the alarms. Once all existing alarms are cleared (by pressing the
RESET softkey), the default CVC display returns to normal operation.
— CONTROL
OIL PRESSURE
LINE VOLTAGE — HIGH — LOW
— SINGLE-CYCLE COMPRESSOR MOTOR LOAD
STARTER ACCELERATION TIME (Determined by inrush current)
STARTER TRANSITION CONDENSER FREEZE PROTECTION
DISCHARGE SUPERHEAT VARIABLE DIFFUSER OPERATION
Shunt Trip (Option) — The function of the shunt trip option on the PIC II is to act as a safety trip. The shunt trip is wired from an output on the ISM to a shunt trip equipped mo- tor circuit breaker. If the PIC II tries to shut down the compres- sor using a normal shutdown procedure but is unsuccessful for 20 seconds, the shunt trip output is energized and causes the circuit breaker to trip off. If ground fault protection has been applied to the starter, the ground fault trip also energizes the shunt trip to trip the circuit breaker. Protective devices in the starter can also energize the shunt trip. The shunt trip feature can be tested using the Control Test feature.
Default Screen Freeze — When the chiller is in an alarm state, the default CVC display “freezes,” that is, it stops updating. The first line of the CVC default screen displays a primary alarm message; the second line displays a secondary alarm message.
The CVC default screen freezes to enable the operator to see the conditions of the chiller at the time of the alarm. If the value in alarm is one normally displayed on the default screen, it flashes between normal and reverse video. The CVC default screen remains frozen until the condition that caused the alarm
35
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