Carrier Comprehensive Guide to Shunt Trip Wiring Diagram and Safety Limits
Page 35

Table 3 — Protective Safety Limits and Control Settings

MONITORED PARAMETER

LIMIT

APPLICABLE COMMENTS

TEMPERATURE SENSORS OUT OF

–40 to 245 F (–40 to 118.3 C)

Must be outside range for 2 seconds

RANGE

 

 

PRESSURE TRANSDUCERS OUT OF

0.06 to 0.98 Voltage Ratio

Must be outside range for 3 seconds.

RANGE

 

Ratio = Input Voltage ÷ Voltage Reference

COMPRESSOR DISCHARGE

>220 F (104.4 C)

Preset, alert setting configurable

TEMPERATURE

 

 

MOTOR WINDING TEMPERATURE

>220 F (104.4 C)

Preset, alert setting configurable

BEARING TEMPERATURE

>185 F (85 C)

Preset, alert setting configurable

EVAPORATOR REFRIGERANT

<33 F (for water chilling) (0.6°C)

Preset, configurable chilled medium for water

TEMPERATURE

 

(SETUP1 table)

 

<EVAP REFRIG TRIPPOINT (set point adjustable

Configure chilled medium for brine (SETUP1

 

from 0 to 40 F [–18 to 4 C]) for brine chilling)

table). Adjust EVAP REFRIG TRIPPOINT for

 

 

proper cutout

TRANSDUCER VOLTAGE

<4.5 vdc> 5.5 vdc

Preset

CONDENSER PRESSURE — SWITCH

165 ± 5 psig (1138 ± 34 kPa), reset at

Preset

 

110 ± 7 psig (758 ± 48 kPa)

 

— CONTROL

165 psig (1138 kPa)

Preset

OIL PRESSURE

Cutout <15 psid (103 kPad)

Preset

 

Alert <18 psid (124 kPad)

 

LINE VOLTAGE — HIGH

>150% for one second or >115% for ten seconds

Preset, based on transformed line voltage

 

 

to ISM. Also monitored at CVC/ICVC and

— LOW

<85% for ten seconds or ≤80 for 5 seconds or

CCM power input.

 

<75% for one second

 

 

— SINGLE-CYCLE

<50% for one cycle (if enabled)

Default is disabled.

COMPRESSOR MOTOR LOAD

>110% for 30 seconds

Preset

 

<15% with compressor running

Preset

 

>15% with compressor off

Preset

STARTER ACCELERATION TIME

150% RLA for 20 sec.

For chillers with reduced voltage mechanical

(Determined by inrush current)

 

and solid-state starters

>100% RLA for 45 sec.

 

 

 

>100% RLA for 10 sec.

For chillers with full voltage starters

 

 

(Configures on ISM_CONF table).

STARTER TRANSITION

If ISM contact open >20 sec.

Reduced voltage starters only

CONDENSER FREEZE PROTECTION

Energizes condenser pump relay if

CONDENSER FREEZE POINT configured in

 

condenser refrigerant temperature or condenser

SETUP1 table with a default setting of 34 F

 

entering water temperature is below the configured

(1 C).

 

condenser freeze point temperature. Deenergizes

 

 

when the temperature is 5 F (3 C) above con-

 

 

denser freeze point temperature.

 

DISCHARGE SUPERHEAT

Minimum value calculated based on

Calculated minimum required superheat

 

operating conditions and then compared

and actual superheat are shown on

 

to actual superheat.

OVERRIDE screen.

VARIABLE DIFFUSER OPERATION

Detects discharge pulses caused by

Preset, no calibration needed.

 

incorrect diffuser position.

 

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/ICVC display “freezes,” that is, it stops updating. The first line of the CVC/ICVC default screen displays a primary alarm message; the second line displays a secondary alarm message.

The CVC/ICVC default screen freezes to enable the opera- tor 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/ ICVC default screen remains frozen until the condition that

caused the alarm is remedied by the operator. Use CVC/ICVC display and alarm shutdown record sheet (CL-13) 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/ICVC display returns to normal operation.

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Contents Safety Considerations Start-Up, Operation, and Maintenance InstructionsContents Contents Abbreviations and Explanations Introduction19XR Identification Chiller FamiliarizationTypical 19XR Components Motor and Lubricating OIL Cooling Cycle Refrigeration CycleLubrication Cycle VFD Cooling CycleUnit-Mounted Solid-State Starter Optional Starting EquipmentDefinitions Unit-Mounted Wye-Delta Starter OptionalControls Variable Frequency Drive VFD 19XR Controls and Sensor Locations PIC II Component Panel Location Major PIC II Components Panel LocationsControl Panel CVC/ICVC Operation and Menus Fig Example of Status Screen 19XR Chiller Display Menu Structure CVC/ICVC 19XR Service Menu Structure Time and Date Example of Time Schedule Operation Screen Example of Set Point Screen CVC/ICVC Display Data Example 1 Chiller Display Default ScreenStartup Description Status Units Point Example 2 Maintstat Display ScreenDescription Status Units Point Example 3 Startup Display ScreenExample 5 Heatex Display Screen Example 4 Compress Display ScreenExample 7 Ismstat Display Screen Example 6 Power Display ScreenExample 9 Setpoint Display Screen Menu Setpoint Select Description Status Units Point DefaultExample 8 CVC/ICVCPSWD Display Screen CVC Icvc Description Status Units PointExample 12 Llmaint Display Screen Example 11 Override Display ScreenControl Algorithm Status Override Description Units Point Control Algorithm Status Wsmdefme Description Units Point Example 13 Ismhist Display ScreenExample 14 Wsmdefme Display Screen Example 16 Ismconf Display Screen ISM Starter Config DataIsmconf Description Status Units Point Default Example 15 Netopt Display ScreenExample 17 Options Display Screen Example 18 SETUP1 Display ScreenSpare ALERT/ALARM Enable LAG=2, STANDBY=3 Example 19 SETUP2 Display ScreenExample 20 Leadlag Display Screen Example 22 Tempctl Display Screen Description Status Units Point DefaultReset Type Example 21 Rampdem Display ScreenPIC II System Functions Normal Control mode occurs when Active Delta TSurge Prevention Mode occurs when Active Delta T Mode IGV VFDPage Protective Safety Limits and Control Settings Page Capacity Overrides Evaporator Freeze Protection Icvc only a Page Head Pressure Reference Output Surge Protection Fixed Speed ChillerPage Page Point Example of Attach to Network Device Screen Example of Holiday Period Screen Local Start-Up Local start-up or a manual start-up is Default CVC/ICVC screen, press the MenuSTART-UP/SHUTDOWN Recycle Sequence FigEntering Condenser Water temperature plus 3 F -1.6C Equipment Required Before Initial START-UPJob Data Required 19XR Leak Test Procedures Page Page Temperature Pressure HFC-134a Pressure Temperature FHFC-134a Pressure Temperature C Perform dehydration as follows Inspect WiringWhite G Check StarterManufacturer Cable no Software Configuration Parameter Benshaw RediStart Micro Menu Items Verify VFD Configuration and Change Parameters if Necessary Description Settings VFD Title Setting ParameterDescription Setting Press Menu Press Status Press Compress Press Select Press Status Press Compress Press SelectLoad Surge Prevention Occurs TOO Soon Occurs TOO Late Estimated Minimum Load ConditionsCCM Temperature Thermistors Tests to be Devices Tested Performed Charge Refrigerant into ChillerControl Test Menu Functions Refrigerant HFC-134a Charge Initial START-UPCheck Oil Pressure and Compressor Stop Dry Run to Test Start-Up SequenceCheck Motor Rotation To Stop the Chiller Operating InstructionsOperator Duties To Start the ChillerOperating the Optional Pumpout Unit Pumpout and Refrigerant Transfer ProceduresFLA Date Cooler Condenser CompressorTime BearingValve Condition Turn off pumpout condenser waterChillers with Isolation Valves Test After Service, Repair, or Major Leak If General MaintenanceGuide Vane Actuator Linkage Weekly MaintenanceCheck Safety and Operating Controls Monthly Scheduled MaintenanceInspect the Heat Exchanger Tubes and Flow Devices Compressor Bearing and Gear MaintenanceOptional Pumpout System Controls Ordering Replacement Chiller Parts WhenChecking Pressure Transducers Troubleshooting GuideOccdefcm HeatexLlmaint Ready to Start Terminate Pumpdown ModeShutdown in Progress ICE BuildRunning Temp Control PrestartAlert Autorestart in ProgressSensor FaultRUN Capacity LimitedStop ProtectiveFailure to StartFREEZE-UP LossCommunication PotentialPending Sensor AlertLOW OIL Pressure AutorestartDiffuser Pressure AlertRecycle Option SensorDrop Thermistor Temperature F vs. Resistance/Voltage DropTemperature PIC Resistance Thermistor Temperature C vs. Resistance/Voltage DropControl Modules Power is connected to Plug J1 on each moduleReplacing Defective Processor Modules Chiller Control Module CCM FigIntegrated Starter Module Fig Integratedstartermodule Checked Measure SCR Pairs Recorded Being BetweenNumber of Tubes English Code Heat Exchanger Data EnglishNumber of Tubes Code Heat Exchanger Data SI19XR Additional Data for Marine Waterboxes Compressor WeightsEnglish Motor 19XR Motor Weights Standard and High Efficiency Motors19XR Waterbox Cover Weights English lb 19XR Waterbox Cover Weights SI kg Motor Voltage Code Additional Miscellaneous WeightsOptional Pumpout System Electrical Data Description Torque Compressor Assembly TorquesCompressor Code View B High Speed Shaft 19XR Compressor ClearancesAllen-Bradley Wye-Delta Unit-Mounted Starter 100101 ISM 102Temp 103104 105 106 107 Power Panel Wiring Schematic108 Cutler-Hammer Wye Delta Unit Mounted Starter Sizes 3-5DP109 Cutler-Hammer Wye Delta Unit Mounted Starter Size 6DPSeparate Metering Option Ground Fault Phase Current Option111 AUX 112FU Fuse 113114 VFD 115116 Typical Variable Frequency Drive VFD Wiring Schematic117 118 119 120 121 122 Index Index JOB Data Required Remove and use for job fileCL-2 Inspect Wiring and Record Electrical Data Ratings15 to 40 to 10010 to 60.0CL-4 85 to 200 to460 105 to 115CL-6 30 to50 to 20 to Psi125 to 150 to90 to 125Amp 250 CL-8 65 to90 to 100 CL-9 25 toCL-10 50 to 145CL-11 0000 to0200 0000 to 0200000 100 to Selected line voltage 002 Power Module Dependent Selected motor 100% amps004 To H.022 Job Sheet 60 for 60 Hz and 50 for 50 Hz 028 10 to Job Sheet 60 for 60 Hz and 50 for 50 HzCL-13 CL-14 CCN Local ResetPage Incurring obligations
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19XR, XRV specifications

The Carrier 19XR and 19XRV chillers are sophisticated cooling solutions that represent the forefront of HVAC technology. Designed for large commercial and industrial applications, these chillers provide exceptional performance, energy efficiency, and reliability, making them ideal for a variety of environments ranging from hospitals to manufacturing facilities.

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