Lakeshore Learning Materials 622 - Manual (Page 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 . 0 0 1 V
* * H I A C L I N E * *
O U T P U T S : *
+1.999A
T H E U N I T W I L L B E T U R N E D
O F F T O A V O I D D A M A G E .
V E R I F Y A C I N P U T S E T T I N G
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 . 0 0 1 V
* * T E M P F A U L T * *
O U T P U T S : *
+1.999A
T H E U N I T W I L L B E T U R N E D
O F F T O A V O I D D A M A G E .
I N T E R N A L T E M P T O O H I
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 . 0 0 1 V
* * R A I L F A U L T * *
O U T P U T S : *
+1.999A
T H E U N I T W I L L B E T U R N E D
O F F T O A V O I D D A M A G E .
D C R A I L V O L T A G E T O O H I
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:
C A U T I O N ! S E T T I N G N O T S A M E A S S A V E D V A L U E
L A S T P E R S I S T E N C E C U R R E N T :
P R E S E N T S U P P L Y C U R R E N T :
E N T E R K E Y T O C H A N G E T O L A S T P E R S I S T E N C E
C U R R E N T , W A I T R U N U P D E L A Y , T H E N T U R N O F F .
¥ K E Y T O T U R N O F F A T P R E S E N T C U R R E N T .
E s c K E Y T O A B O R T .
H E A T E R C U R R E N T : 5 0 m A
1 0 . 0 0 0 A
5 . 0 0 0 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 . 0 0 1 V
* * O U T P U T I N H . * *
O U T P U T I N H I B I T :
T H E O U T P U T C U R R E N T S E T -
T I N G I S F O R C E D T O Z E R O .
T H E O U T P U T S E T T I N G S
C A N N O T B E C H A N G E D U N T I L
O I I S R E L E A S E D .
O U T P U T S : *
+1.999A
+ 0 . 0 0 1 V
* * O U T P U T I N H . * *
O U T P U T S : *
+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:
O U T P U T C U R R E N T W O U L D B E S E T T O M O R E T H A N
I S T E P L I M I T P E R M I T T E D I N 1 U P D A T E .
T H E C U R R E N T S E T T I N G W I L L N O T B E C H A N G E D .
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:
T H E P E R S I S T E N C E I S O F F .
T H E S W I T C H H E A T E R I S O N .
C A N N O T B E G I N W I T H H E A T E R O N .
H I T T H E E s c K E Y T O A B O R T .
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:
T H E M A G N E T S T A R T C U R R E N T A N D T H E M A G N E T
E N D C U R R E N T A R E T H E S A M E . P R E S S T H E E s c
K E Y T O A B O R T , T H E E N T E R K E Y T O C O N T I N U E .
CAUTION
Maximum Power Output Exceeded
When users utilize external current programming and
output power exceeds 1000 watts, the MPS displays:
+ 0 . 0 0 1 V
* * O V E R P O W E R * *
M A X I M U M P O W E R O U T P U T
E X C E E D E D :
T H E O U T P U T P O W E R I S
G R E A T E R T H A N P E R M I T T E D .
S E E M A N U A L F O R L I M I T .
T H E O U T P U T C U R R E N T I S
F O R C E D T O Z E R O A M P E R E .
P R E S S ¥ T O C L E A R E R R O R .
O U T P U T S : *
+1.999A
O U T P U T S : *
+1.999A
Front panel settings are software limited to prevent
power over 1000 watts.