User manual

LABKON Series
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GMC-I Messtechnik GmbH 23
3.7 Error Messages Display
If some error has been detected, “err” annunciator will be lit. Then you can read the error messages through front panel
operation with following steps:
1 Press “2nd” + “Error” keys and the display will show the error messages.
Example 1: if there is a wrong command, “err” annunciator will turn on. Then check the error messages with following steps:
Step
Operational Details
Display Information
1
Press “2nd” +“Error” keys and the display will show the
error messages.
ERROR -103
2
If some error has been detected, repeat the first step.
3
When there is no error, “err” annunciator will be off.
Repeat the first step, then “NO ERROR” will be showed
in the display.
NO ERROR
3.8 Local/ Remote Operation Switch
If it is necessary to operate the power supply with the keys and knobs of the front panel, the power supply must be kept in
local control state. The power supply will be in this state as soon as it is switched on.
In remote control state, all keys and knobs become invalid (except “2nd” and “Local” keys). When the power source receives
the remote command (SYST:REM) through RS232 Interface or commands through GPIB Interface, REM annunciator will be
on and remote control becomes valid. In remote control state, all operations of the power supply are controlled by remote
controller. After receiving the command demanding the power supply to return to local control (eg. SYST:LOC ), the power
supply will go back to local control state and REM annunciator will be off. In remote control state, the power supply can be
returned to local control state by pressing “2nd” +“Local” keys even if it has not received the returning command.
3.9 Protection Function
There are two protections states: over-voltage protection and over-temperature protection for LABKON Series. Once
anything abnormal is detected, the corresponding state symbol in the State Register will be set; the power supply will disable
its output and beep to give an alarm; the display reveals the reason for the unusual condition and the power supply enters
into abnormal latched state. Except specific operations, the supply will stop responding to other commands. For example:
when the temperature is too high, supply output will turn off and beep to give an alarm. OT will be showed in the lower right
corner of the display and the power supply will not respond to other commands.
3.9.1 Abnormal Latched State Clearance
When the power supply enters into abnormal latched state, it fails to respond to other commands. Only when the abnormal
latched state is cleared by pressing “2nd” + “Clear” keys, can normal operations be restored. Obviously, the reason for the
abnormal latch must be solved, or the power supply will enter into abnormal latched state once again immediately.
3.9.2 Over-Voltage
The user can set the over-voltage protection value (Voltage Over) in the menu as needed. When the supply's output voltage
is higher than the set value, the system enters into over-voltage protection status and the display shows OV. This state can
be cleared by decreasing the output voltage or increasing the over-voltage protection value. Otherwise, even though you can
remove the latched state by pressing “2nd” + “Clear” keys, the system will automatically enter over-voltage protection status
once again for over-voltage.
3.9.3 Over-Temperature
If the internal temperature of the supply is above the safety limitation, over-temperature protection will be triggered; the
supply output will turn off and OT is displayed. In the meantime, OT and PS in the Questionable Status Register will be set
and keep in this state until they are reset and over-temperature state is removed. You can’t clear the abnormal latched state
until the supply temperature falls to its normal range.