Lakeshore Learning Materials 622 Manual do Utilizador descarregar pdf (Página 61)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual

Error Messages & Troubleshooting

5-3

High AC (HI AC) Detected

Any time the AC line rises above 120% of the

nominal line selected, the MPS turns off the front

panel circuit breaker and enters AC Loss Mode.

This halts excessive utility voltages to internal

circuitry. If this occurs on power up, the MPS turns

off the front panel circuit breaker and displays:

+0.001V

** HI AC LINE**

OUTPUTS: *

+1.999A

THE UNIT WILL BE TURNED

OFF TO AVOID DAMAGE.

VERIFY AC INPUT SETTING

HI AC INPUT

LINE FAULT:

Overtemperature Detected

If the MPS detects internal over temperature or

other internal fault, it activates the OVP circuit,

turns off the front panel circuit breaker, and then

turns itself off. OVP stays active until it completely

discharges the load. If the heat sink temperature

exceeds 95 °C (203 °F), the MPS displays:

+0.001V

** TEMP FAULT**

OUTPUTS: *

+1.999A

THE UNIT WILL BE TURNED

OFF TO AVOID DAMAGE.

INTERNAL TEMP TOO HI

INTERNAL

TEMP FAULT:

Rail Fault Detected

Excessive DC rail voltage (unable to return power

to the utility or some other internal fault), causes

the MPS to display:

+0.001V

** RAIL FAULT**

OUTPUTS: *

+1.999A

THE UNIT WILL BE TURNED

OFF TO AVOID DAMAGE.

DC RAIL VOLTAGE TOO HI

INTERNAL

RAIL FAULT:

PSH Current Not The Same As Saved Value

When the PSH is turned ON, the MPS checks the

present current setting against the current setting

stored when the PSH was turned OFF. If the two

do not match, the MPS sounds an alarm for about

½ second and displays:

CAUTION! SETTING NOT SAME AS SAVED VALUE

LAST PERSISTENCE CURRENT :

PRESENT SUPPLY CURRENT :

ENTER KEY TO CHANGE TO LAST PERSISTENCE

CURRENT, WAIT RUNUP DELAY, THEN TURN OFF.

¥ KEY TO TURN OFF AT PRESENT CURRENT.

Esc KEY TO ABORT.

HEATER CURRENT: 50 mA

10.000 A

5.000 A

Press the Data Entry up or down arrow to turn the

PSH ON. Press no key for approximately 30

seconds, or press Esc to keep the PSH OFF.

Output Inhibit

When the red Output Inhibit button is pressed, the

MPS displays:

+0.001V

**OUTPUT INH.**

OUTPUT INHIBIT:

THE OUTPUT CURRENT SET-

TING IS FORCED TO ZERO.

THE OUTPUT SETTINGS

CANNOT BE CHANGED UNTIL

OI IS RELEASED.

OUTPUTS: *

+1.999A

+0.001V

**OUTPUT INH.**

OUTPUTS: *

+1.999A

I STEP Limit Exceeded

When the user attempts to change the current setting

by more than the step limit setting, the MPS displays:

OUTPUT CURRENT WOULD BE SET TO MORE THAN

I STEP LIMIT PERMITTED IN 1 UPDATE.

THE CURRENT SETTING WILL NOT BE CHANGED.

I STEP LIMIT EXCEEDED

BY THIS SETTING

Caution – Persistence Is Off, Heater Is On

When the user attempts to start Automatic Mode with

persistence Off, the MPS displays:

THE PERSISTENCE IS OFF.

THE SWITCH HEATER IS ON.

CANNOT BEGIN WITH HEATER ON.

HIT THE Esc KEY TO ABORT.

CAUTION

Caution – Same Magnet Start and End Current

To enter an automatic PSH cycle, the magnet start and

end current must be different. If they are the same, the

MPS displays:

THE MAGNET START CURRENT AND THE MAGNET

END CURRENT ARE THE SAME. PRESS THE Esc

KEY TO ABORT, THE ENTER KEY TO CONTINUE.

CAUTION

Maximum Power Output Exceeded

When users utilize external current programming and

output power exceeds 1000 watts, the MPS displays:

+0.001V

**OVER POWER **

MAXIMUM POWER OUTPUT

EXCEEDED:

THE OUTPUT POWER IS

GREATER THAN PERMITTED.

SEE MANUAL FOR LIMIT.

THE OUTPUT CURRENT IS

FORCED TO ZERO AMPERE.

PRESS ¥ TO CLEAR ERROR.

OUTPUTS: *

+1.999A

OUTPUTS: *

+1.999A

Front panel settings are software limited to prevent

power over 1000 watts.

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