American Standard CH530 Momentary Power Loss (MPL) Protection.

CDHF-SVU01C-EN

72

Momentary Power Loss (MPL)Protection.

Improved power measurement and

protection algorithms allow the unit

to accommodate more power

anomalies than ever. If the chiller

must shut down, faster restarts get

the machine up and running as soon

as possible.

Momentary power loss (MPL) detects

the existence of a power loss to the

compressor motor and responds by

initiating the disconnection of the

compressor motor from the power

source. Power interruptions of less

than 30 line-cycles are defined as

momentary power losses. Tests have

shown that these short-term power

interruptions can be damaging to the

motor and compressor if the chiller

is reconnected to the line while the

motor and line phases do not match.

The chiller will be shut down when a

MPL is detected and will display a

non-latching diagnostic indicating

the failure. The oil pump will be run

for the post-lube time period when

power returns. The compressor and

compressor motor are protected from

damage from large torques and

inrush currents resulting from

reconnecting the compressor motor

to the power source following a

momentary loss of power.

MPL’s greater than 2 or 3 cycles are

detected resulting in unit shut down.

Disconnection from the line is

initiated within 6 line cycles of the

power loss. MPL protection is active

anytime the compressor is in the

running mode. (The transition

complete input has been satisfied).

MPL is enabled however can be

disabled, if required via the service

tool.

Figure 29. Sequence of operation: momentary power loss, (DynaView

™

and starter module remain powered)

Machine Protection

and Adaptive

Control

Enforce Stop to Start Timer

(5 to 200 Seconds 7 Sec is Default)

Contents

Main Warnings and Cautions Contents Typical Product Description Block Unit Nameplate Literature change About this manual Page Page Commonly Used Acronyms Figure 1. General Duplex unit components - front view Page Cooling Cycle Page Page Page Figure 7. Sequence of operation overview. Figure 8. CDHE/F/G sequence of operation: auto to running Figure 9. CDHE, CDHF, and CDHG sequence of operation: running Page Figure 12. CDHF/G sequence of operation: lead 1/lag 2 Figure 13. CDHE/F/G sequence of operation: lead 2 lag 1 Figure 14. CDHF/G sequence of operation: equalize starts and hours Figure 15. CDHF/G sequence of operation: combined start Page Oil and Refrigerant Pump Surface Temperatures! Page Base Loading Control Algorithm: Page Ice Machine Control Figure 18. Sequence of operation: ice making: running to ice making Figure 19. Sequence of operation: ice making: stopped to ice to ice building complete Hot Water control Unit Control Panel (UCP) Control Panel Devices and Unit Mounted Devices Figure 20. Left control panel Unit Control Panel (UCP) Tracer CH530 Chiller Controller Figure 21. DynaView main processor Page Page A general description of the top level modes is show in the following table. Figure 22 Figure 23 Page Main Screen Data Fields Table Diagnostic Screen Page Page Report Menu Report name: System Evaporator Report name: Circuit Evaporator Report name: System Condenser Report name: Circuit Condenser Report name: System ASHRAE Chiller Log Report name: Circuit ASHRAE Chiller Log Historic Diagnostics Log Page Chiller Feature Settings System Mode Overrides Circuit Mode Overrides (0 to disable) Purge Display Settings { Page Page Page Page Control Panel Internally mounted devices Interprocessor Communication Inter Processor Communications IPC3 Page Page Control Panel Devices Head Relief Request Output Maximum Capacity Relay Compressor Running Relay Machine Shutdown Manual Reset (MMR) Chilled and Condenser Water Flow Interlock Circuits Refrigerant Monitor Input 1A17 Page CDRP Refrigerant Pressure Output Option 1A15: Figure 25. Condenser pressure based output Page GBAS (Generic Building Automation System) Figure 27. Voltage versus percent RLA External Chilled Water Setpoint (ECWS) External Current Limit Setpoint WPSR (WFC Water Pressure Sensing Option) Module Characteristics Page Recommended Length to Run external Output signals Unit mounted devices Page Page Electrical Sequence UCP and Wye-Delta Starter Control Circuits Page Page Figure 24. Test and start timing sequence Page Momentary Power Loss (MPL) Protection. and starter module remain powered) Figure 29. Sequence of operation: momentary power loss, (DynaView Current Overload Protection Figure 30. Overload trip time versus percent RLA Current Limit Protection Reverse Rotation Protection Differential to Start or Stop SoftLoading Evaporator Limit Leaving Water Temperature Cutout Low Refrigerant Temperature Cutout Page Condenser Limit Restart Inhibit Page Page Controls Chilled Water Reset (CWR) Return Water = Maximum Reset. Outdoor Air Temperature Where Constant Return Reset Ratio: Figure 32. Outdoor air temperature versus degrees of reset Page Page Page Unit Start-Up Procedures Unit Startup Seasonal Unit Start-Up Unit Startup Live Electrical Components! Toxic Hazards! Unit Shutdown Unit Shutdown Procedures Seasonal Unit Shutdown Oil Pump Heater Operation! Trouble Analysis Moisture Contamination! Hazardous Voltage w/Capacitors! Normal Chiller Operating Characteristics Weekly Maintenance Every 6 Months Every 3 Months Off-Season Maintenance Annual Maintenance Oil Maintenance Compressor Oil Change Oil Change Procedure Heater Damage! Oil Maintenance Replacing Oil Filter Other Maintenance Requirements Oil Supply System Problems! Hazardous Voltage w/ Capacitors! Figure 37. Rotary valve in drain position Refrigerant Charge Contains Refrigerant! Recovery and Recycle Connections Leak Testing Figure 38. Typical chemical cleaning setup Cleaning the Condenser Proper Water Treatment! Unit Corrosion Damage! Cleaning the Evaporator Control Settings and Adjustments Purge System Unit Preparation Contains Refrigerant! Live Electrical Components!