Lakeshore Learning Materials 622 - Manual (Page 59)

Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual
Error Messages & Troubleshooting 5-1
CHAPTER 5
ERROR MESSAGES AND TROUBLESHOOTING
5.0 GENERAL
This chapter covers Software Error Messages
(Paragraph 5.1), Factory Default Settings (Para-
graph 5.2), Calibration Procedure (Paragraph 5.3),
Performance Test (Paragraph 5.4), Rear Panel
Connectors Definition (Paragraph 5.5), IEEE-488
Connector Definition (Paragraph 5.6), and Serial
Interface Cable and Adapters (Paragraph 5.7).
5.1 SOFTWARE ERROR MESSAGES
The MPS constantly monitors its circuits for faults
like low or high line voltage, line loss, or internal
temperature and rail faults. Upon detection, the
error and a brief description display. Below are
error messages that may display during normal
operation:
Error 01 – Unwriteable NOVRAM Error
A N U N W R I T E A B L E N O V R A M D A T A L O C A T I O N
E X I S T S I N T H E D I S P L A Y N O V R A M . T H I S
E R R O R I S N O T C O R R E C T A B L E B Y T H E U S E R .
C O N T A C T L S C I F O R A R E P L A C E M E N T N O V R A M .
ERROR 01:
Error 02 – NOVRAM Data Verification Error
A N O V R A M D A T A V E R I F I C A T I O N E R R O R E X I S T S
I N T H E D I S P L A Y N O V R A M . I N I T I A L I Z E T H E
N O V R A M B Y P R E S S I N G T H E E s c K E Y F O R
1 0 S E C O N D S . I F T H E E R R O R S T I L L E X I S T S ,
C O N T A C T L S C I F O R A R E P L A C E M E N T N O V R A M .
ERROR 02:
Error 06 – Calibration Data NOVRAM Error
A C A L I B R A T I O N D A T A N O V R A M E R R O R E X I S T S
I N T H E M A I N F R A M E . M A I N F R A M E C A L I B R A T I O N
M U S T B E P E R F O R M E D . C O N T A C T L S C I .
ERROR 06:
Output Current Step Limit Exceeded
If the MPS detects an output current change that
exceeds the step limit, it enters Step Limit Mode
and forces MPS output to 0 amps and 1 volt. On
the next display update cycle, the MPS closes the
FLT contacts to indicate the fault, sounds an alarm
about once per second, and displays:
+ 0 . 0 0 1 V
* S T E P L I M I T ^ *
I S T E P L I M I T E X C E E D E D :
O U T P U T C U R R E N T C H A N G E D
M O R E T H A N T H E I S T E P
L I M I T I N O N E U P D A T E .
T H E O K U T P U T S E T T I N G S A R E
F O R C E D T O 0 A N D 1 V .
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
The MPS sounds the alarm and halts operation until
the user presses a Data Entry up or down key to clear
the fault. When the fault clears, the MPS opens the
FLT contacts, silences the alarm, and displays the
normal display.
Remote Inhibit (RI) Detected
The Remote Inhibit (RI) and Fault (FLT) indicators
provide hardware fault indication and remote shutdown
in addition to internal protection features. The FLT
indicator is a set of normally closed contacts when the
unit is OFF. When the unit is ON and no fault is
present, the contacts are open. If the MPS detects a
fault or an RI input assertion from an external contact
closure, it enters Remote Inhibit Mode, forces output
settings to 0 amps and 1 volt, and turns ON the front
panel Fault annunciator. The MPS closes the FLT
contacts to indicate a fault, sounds the alarm once per
second, and displays:
+ 0 . 0 0 1 V
* * R E M O T E I N H . * *
R E M O T E 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
R I I S R E L E A S E D .
O U T P U T S : *
+1.999A
The alarm stops sounding when RI is removed, but the
MPS continues to display RI until the user enters new
output settings, then turns them OFF. This latching
action informs the user of RI activity.
When the MPS detects no RI input activity, it turns
OFF the front panel Fault annunciator and internal
alarm, and opens the FLT contacts. When the MPS
software detects open FLT contacts (RI is inactive), it
displays the Normal Display.
To insert a 2 to 3 second delay between RI activation
and the initial fault operation, turn CAL AND ID switch
7 ON (up); the MPS polls for RI activity after the delay.
If RI is still active, the fault operation continues; if not, it
is ignored.
In multiple MPS configuration, if an external contact
closure activates the MPS RI indicators, the MPS units
enter Multiple MPS Remote Inhibit Mode. They activate
their output over voltage protection (OVP) circuits and
turn off their output circuits. If a charged load is
present, the OVP circuits discharge it, the front panel
Fault annunciators turn ON, and the alarm sounds
about once per second. If a MPS detects a fault, it
closes the FLT contacts to initiate Multiple MPS
Remote Inhibit Mode.