Conair MPW, MPA manual Checking Replacing Fuses, If fuses continue to fail

Page 69

This procedure covers the factory-installed fuses on the unit’s motherboard. If you have installed an electrical disconnect or emergency stop switch, additional fuses and/or breakers may have been used elsewhere in the in the main power circuit.

To replace a blown fuse:

1	Disconnect and lockout the main power.

2	Open the electrical enclosure door. Turn the screw
	on the front panel counterclockwise to open.

3	Replace the fuse. The fuses are located on the mother-
	board and are labeled and identified on the orange shield.

4	Close the electrical enclosure and restart the unit.

If fuses continue to fail:

❒Verify that the unit is receiving the correct voltage. Check the voltage, phasing and amperage ratings on the unit’s nameplate.

❒Verify that the unit’s transformer is operating correctly. Check for proper voltage (120V 10%) to the voltage sensing device for the fuse location.

❒Check all wiring referencing the fusing location for loose connections, damage or improper grounding. Verify that the correct device is being used for this fuse

location. See DISABLING OR ENABLING OUTPUT

MONITORS in the MAINTENANCE section.

CHECKING AND

REPLACING

FUSES

WARNING:

Shock Hazard

Only qualified service personnel familiar with electrical testing and industrial equipment should examine and correct problems that require opening the unit with power on to diagnose the cause of a problem.

						6 5 4 3 2 1	4 3 2 1
Fuse 1						LLS/WPS LLS/WPS AUTOSTART AUTOSTART HPS/LPS HPS/LPS	OPS OPS FSTAT FSTAT	L1	L2	L3
Control	AC IN 4	AC IN + 3	AC OUT 2	AC OUT + 1	F1			3 PHASE INPUT
Control
power

F5							Fuse 5
						4
UNLDR 1/ VENT 2 SOL			+			4	Unloader valve 1
UNLDR 1/ VENT 2 SOL						3	Unloader valve 1
UNLDR 2/ COOL 1 SOL			+			2
UNLDR 2/ COOL 1 SOL						1	Fuse 4
F4							Fuse 4
F4							Unloader valve 2
	PUMP
	PUMP				4
	PUMP				3
	PUMP OL					2
	PUMP OL					2
	PUMP OL				1

F2 Fuse 2

Pump

		PMP AUX	6
		PMP AUX	5
		1FS/ PURGE/ COMP AUX	4
OFF		1FS/ COMP AUX	3
OFF	8 7 6 5 4 3 2 1	PUMPDOWN	2
		PUMPDOWN	1

IMPORTANT: Always refer to the wiring dia-

ON

CONFIGURATION

DIP SWITCH

HEAT/COMP

HEAT/COMP

HTS/COMP OL

HTS/COMP OL

F3

4
3
2
1	Fuse 3
6	Fuse 3

grams that came with your chiller to locate spe-

ALARM

N

C

NC

5	Compressor
4	Compressor
3

cific electrical compo-

+ 120 Ohm + TR TR GND GND + TR TR 120 Ohm				(-2) CONTROL OPER PNL CABLE

NO

C 110V

LLS/PURGE 3SOL
LLS/PURGE 3SOL			+
PURGE 4SOL
PURGE 4 SOL			+
TCPL'S			F6
SUP RET
Y R R Y

2

1

4

3

2

Fuse 6

Level switch

nents. Illustrations in the User Guide are intended to be representative only.

1

2

3

4

5

6

7

8

1

2

3

4

UGH004/0999

microKool Portable Chillers

TROUBLESHOOTING 6-13

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Contents Page Date Manual Number UGH004/0999 Serial numbers Model numbers Introduction Table of ContentsTroubleshooting Introduction Purpose User Guide HOW Guide is OrganizedYour Responsibility AS a User Read this SO no ONE Gets Hurt Page Description What is the Microkool CHILLER?Typical Applications HOW IT Works Water Cooled HOW IT Works AIR Cooled High Efficiency Compressors FeaturesPsi Pressure Specifications MPW Water CooledMPA-5 Specifications MPA AIR CooledFreeze Protection Requirements Freezing Points of Aqueous Ethylene Glycol SolutionsInstallation Unpacking BoxesMicroKool Portable Chillers come fully assembled Preparing for Installation Make sure the installation area providesInstall plumbing for process and cooling lines Install pipe to the rear of the chiller Connecting Process Water Supply LinesRemove the shipping pipe plug from the female Coat the pipe threads with thread sealantOpen the unit’s electrical enclosure Connecting Main Power SupplyApply power to the unit Testing the InstallationTurn on the condenser water supply MPW Units and check for leaks. If any leaks appear, stopEntering Setpoint Deviation Parameters Dip switch Configuration Initial SetupOpen the electrical enclosure Change Dip Switch 1 to Changing Temperature UnitsOpen the electrical enclosure Set dip switch 3 to on Disconnect and lock out main power to the unitSelect a new passcode using Setpoint adjustment buttonsPress the RUN button to save the passcode Open the electricalFollow Steps 1 through 5 Select a new control point using the Display button Selecting Temperature Control PointPress the RUN button to save the control point Set dip switch 5 toInsert the two power leads from the device Installing Auto Start FeatureSet dip switch 4 to the on position When Auto Start is enabledTo disable Auto Start Activating SPI Communication Apply power to the chiller Enter the passcode, if necessaryConnect the host machine to the chiller Enter the node addressOperation Setpoint display PC-1 Control FeaturesPumpdown On/Off PC-2 Control FeaturesTo raise and swivel the control panel Positioning Control PanelTo lower the control panel To detach the PC-2 control panelPress Setpoint to select the parameter you want to change Entering a PasscodeEnter the passcode Starting the ChillerStopping the Chiller Using Pumpdown FeatureTo shut down the unit Press Stop Press Button to turn on PumpdownPerforming AN Auto Tune Insufficient setpoint/process deviation Page Maintenance Preventative Maintenance Schedule Quarterly every 3 months Inspect power cords, wires and electrical connectionsCleaning Condensers Cleaning EvaporatorsRefilling the Tank Locate the fill port at Back of the chillerTo fill the reservoir If the charge is low, recharge the system Checking Refrigerant ChargePerforming System Tests Set dip switches 3Press To shut down the chiller Then open the electrical enclosureKEY/DISPLAY Test Connect all inputs to the system Input TestPress any key to display the first test menus Select the Input Test menuOutput Test Connect all outputs to the systemSelect the Output Test menu Select the OM Enable/Disable menu Disabling or Enabling Output MonitorsSave changes and exit the output menu Release the Setpoint key Calibrating Temperature SensorsPress the up key to begin calibrating Exit Calibration ModeWait until the control displays don or bad Press SelectLogging Operating Hours Index through test menus to the operating logExit the Operating Hours Log Troubleshooting FEW Words Before BeginningVerify that you have manuals for other equip Messages shown on the control panel. TheseCause of a Problem HOW to IdentifyMotor? Supplied to the pumpIs the required water flow Greater than the pump’sLoose? Is the thermocoupleLevel Switch fuse Has the indicated device Ply wire leads becomeHas one of the main sup Disconnected?Compressor Refrigerant pressure is either too low or too high Shut Down AlarmsAll models Air-cooled unitsInstalled correctly? Is the freezestat settingFreeze Stat Input is open Is there sufficient fluid Flow through he evaporaCable? Is something wrong withSystem Alarms Chiller Will not Power UP If fuses continue to fail Checking Replacing FusesOn the front panel counterclockwise to open Replace the fuse. The fuses are located on the motherResetting Overloads Check the overloadLocate the pump overload module attached Replacing the Motherboard Reverse this procedure to install the new con Replacing Compressor ContactorRemove and discard the old contactor Checking Unloader Valve Replacing the Freezestat From outside the United States, call WE’RE Here to HelpAppendix A-2 SPI Command Pairs SPI Commands Supported by Conair MicrokoolStatus, Process SPI Status WordsStatus, Machine Appendix B-4 PARTS/DIAGRAMS PD-2 PD-3 PD-4 PD-5