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Table 10 — LID Primary and Secondary Messages and Custom Alarm/Alert Messages

with Troubleshooting Guides (cont)

N. ADDITIONAL TROUBLESHOOTING INFORMATION

DESCRIPTION REMEDY

At power-up, default screen does not ap-

pear. Instead, ‘‘Uploading Tables’’ mes-

sage continually appears.

Check for proper communications wiring on PSIO module. Check that the Level I communications wires are terminated to the

Level I PSIO connection.

Blank LID screen. Check red LED on LID (power supply) for proper operation. If LED is blinking, but green LEDs are not, replace LID module

(memory failure).

Scrambled LID display screens. Attach to the local PSIO bus/address on the Attach to Network Device table of the Service menu.

SMM communications failure. Check that PSIO communication plugs are connected correctly. Check SMM communication plug. Check for proper SMM power

supply. See Troubleshooting Guide on page 68. If battery was removed or battery terminals shorted, module has been erased;

replace. Check that wire strands are not crossing over to other terminal pin connections.

‘‘Communications Failure’’ highlighted

message at bottom of LID.

LID is not properly addressed to the PSIO. Make sure that the Local Device on the Attach to Network Device table is set to read

the PSIO bus/address. Check LEDs on PSIO. Is red LED operating properly? Are green LEDs blinking? See Troubleshooting

Guide on page 68. If battery was removed or battery terminals shorted, module has been erased. Replace, if necessary.

‘‘Control Test Disabled’’ message. Press the STOP softkey. The PIC must be in the OFF mode for the Control Test to operate. Clear all alarms. Check line voltage

percent on Status01 screen. The value must be within 90% to 110%. Check voltage input to SMM. Calibrate starter voltage

potentiometer for accuracy.

Slide valve solenoid will not

energize in Control Test.

Put machine into pumpdown mode or equalize the pressure. Check slide valve actuator solenoid wiring.

Pressure transducers will not

calibrate.

At 0 psi (0 kPa), simply SELECT the transducer then press ENTER softkey. Pressing the INCREASE or DECREASE softkeys

may cause calibration errors. Only use the INCREASE and DECREASE softkeys at the high pressure calibration point.

Pressure transducers are not

reading correctly.

Schrader ﬁttings can be installed too deep. Check that the transducer can fully depress the Schrader valve depressor pin. The

top of the pin should be between .010 in. above the top of the valve body to .035 in. below the top of the valve body. Use a

Schrader ﬁtting installation tool.

Sensor reads −40 F (−40 C). Indicates the loop is open. Check for proper connections and wire placement.

Nuisance high-pressure switch trips. Check Schrader ﬁtting on discharge pressure switch.

Discharge isolation valve appears to be

installed backwards.

There is a small arrow on the discharge isolation valve which would normally indicate the direction of gas ﬂow through the valve.

However, the valve is correctly installed with the arrow pointing upward. This is because the better scaling surface is on the high

pressure side which sees refrigerant pressure during shipment. During machine operation, ﬂow through the valve will not be

restricted and damage to the valve will not be incurred. Refrigerant can be isolated in the cooler since the valve operates reliably

in either direction.

Refrigerant appears to be leaking through

machine insulation.

Gas-off of insulation glue may activate a refrigerant leak detector.

Low megger reading on motor. Liquid refrigerant will remain on bottom of motor housing. Terminal no. 3 will be submerged. May have as low as 1 to 2 megohm

readings on terminal no. 3 and corresponding terminal no. 6 only. Check for power factor correction capacitors on starter.

Machine never comes out of

UNOCCUPIED mode.

Conﬁgure time and date by selecting Time and Date from the Service menu.

Holiday Scheduling and Daylight

Savings Time is not acknowledged.

The broadcast acknowledger on the Equipment Conﬁguration BRODEFS table must be active. Only one broadcast acknowl-

edger per communication network should be active.

Nuisance water/brine ﬂow trips. Check that ﬂow switch contacts are gold plated. Recommended Delta-Pro switch comes preset to make at 2 psid.

(14 kPad) It is possible to adjust this setting lower even though the speciﬁcation states that 2 psid (14 kPad) is the lower limit.

Turn the calibration set screw (counter) clockwise to (decrease) increase the acting.

Shutdown on low oil pressure at

start-up.

Oil pressure created by system pressure differential. System pressure differential established by the difference between leaving

condenser water temperature and leaving chilled water temperature. Minimum differential must exist between ECDW and LCW.

Minimum ECDW at start-up is dependent on several factors (see Oil Cycle section). * Do not defeat machine control timers.

Increase ramp loading rate. Open cooling tower bypass. Decrease ﬂow rates. Check for dirty oil ﬁlter. Later machines include

head pressure control poppet valve. Check that starter transition timer is set such that motor is up to full speed within 5 seconds.

Check economizer back-pressure valve operation, if applicable. Check hot gas bypass ball valve.

Shutdown on low discharge superheat.

(Applicable to Frame 1 and 2 machines

only.)

Excessive oil charge. Refrigerant migration into oil causes oil to rise above baffle in separator, which results in oil ﬂoodback.

Oil is lost to refrigerant circuit; cooler foams up; discharge temperature goes to zero superheat; wet discharge; diluted oil. Oil

must be heated to 35 F (19 C) above evaporator refrigerant temperature to boil off excess refrigerant. Manually reclaim oil from

refrigerant circuit. Remove excess oil. Machine will alarm or indicate low oil level if there was excess oil loss. Check refrigerant

charge.

‘‘Starter Fault’’ message. Starter Fault switch on the front of the starter (if applicable) may be faulty. This Starter Fault switch only indicates a problem

with transition. Other causes of Start Fault are ground fault, under/over voltage relays, and phase relays.

Compressor starts when starter is

reset after alarm shutdown.

When a starter trip occurs, the SMM deliberately maintains its 24-v output to the 1CR relay for up to 10 seconds in order to

determine the type of fault that has occurred.

Default screen readings are locked up

while Status01 screen readings are fine.

Reset all alarms. Default screen reading freeze when an alarm occurs.

CHILLED WATER/BRINE temperature too

high (machine running).

1. Chilled water set point set too high. Access set point on LID and verify.

2. Capacity override or excessive cooling load (machine at design capacity). Check LID status messages. Check for outside

air inﬁltration into conditioned space.

3. Condenser temperature too high. Check for proper ﬂow; examine cooling tower operation; check for air or water leaks.

Check for fouled tubes.

4. Refrigerant level low. Check for leads. Add refrigerant. Trim charge.

5. Liquid bypass in waterbox. Examine division plates and gaskets for leaks.

6. Slide valve fails to close (load). Use Control Test to check operation.

7. Chilled water control point too high. Access Control Algorithm Status to check chilled water control operation.

8. Slide valve fails to close (load) fully. Be sure that the manual slide valve count is released. Check slide valve solenoids.

Check that sensor is in the proper terminals.

CHILLED WATER/BRINE temperature tool

low (machine running).

1. Chilled water set point set too high. Access set point on LID and verify.

2. Chilled water control point too low. Access Control Algorithm Status table to check chilled water control for proper resets.

3. Slide valve fails to open (unload). Be sure that manual slide valve count is released. Check chilled water sensor accuracy.

Check slide valve solenoids.

CHILLED WATER/BRINE temperature

ﬂuctuates; slide valve hunts.

1. Deadband too narrow. Conﬁgure LID for a larger deadband.

2. Proportional band too narrow. Either INC or DEC proportional bands should be widened.

3. Defective slide valve actuator. Check through Control Test.

4. Defective temperature sensor. Check sensor accuracy.

Kilowatt reading on Status01 table does

not change during operation.

This feature is only active when the starter is provided with an optional 4-10 mA kW transducer wired to the SMM.

LEGEND

LED — Light-Emitting Diode

LID — Local Interface Device

PSIO — Processor Sensor Input/Output Module

SMM — Starter Management Module

*A ﬁeld supplied, water temperature control system should be installed. The system should maintain the leaving condenser water temperature at a temperature that is

18 F (10 C) above the leaving chilled water temperature.

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