PEL-60-60-10 - Physical Instruments

PROTECTION FUNCTION
OV PROTECTION
OV DELAY
UV PROTECTION
UV DELAY
OC PROTECTION
OC DELAY
UC PROTECTION
UC DELAY
OP PROTECTION
OP DELAY
UP PROTECTION
UP DELAY
PEL provides programmable OVP/OCP/OPP and UVP/UCP/UPP over-limit and under-limit protection
capabilities. The user can program all of the protection values and delay times. Protection will be activated
when the protection mode has been tripped the PEL will interrupt the input power source. The delay time
provides a programmed delay time to accommodate short duration surges without inadvertently tripping the
unit off.
The delay time is 10mS minimum with resolution 10mS also. The protection can be disabled by setting the
delay time to 0mS.
Press the "Utility/Local" key then use the keys to select the PROTECTION function then the "ENTER"
key. Use keys to select the appropriate protection or delay function by pressing the "ENTER key to
display the current value. Press the "ENTER" key to edit or enter the new value then press the “ENTER” key
to confirm entry. Press “CLEAR” key to escape the PROTECTION MODE.
FAULT signal becomes active TTL high, whenever any of the protections, above, are tripped. When this
occurs, the appropriate bits in the status register are set and the fault signal is latched. The status bits will
remain set until the electronic load is reset via the GPIB or RS232 (*RST command) or at the front panel
(CLEAR key). Of course, the condition that caused the protection feature to trip must be corrected or the load
will turn off again.
: Because the protection is done through software, the response time for the delay trip time
must be set to at least 50mS for each protection feature. Otherwise the load may not reset correctly if
the trip delay time is too short.
RECORD FUNCTION (Optional)
RECORD Setting:
RECORD INTERVAL
RECORD CLEAR
PRINTER ON/OFF
The PEL provide 255 points of recording capability to help the user store test data without extra devices.
The RECORD INTERVAL is the time interval between desired recording points. The interval time can be set
from 10mS to 600,000mS. Once the PEL INPUT has been enabled, recording is activated based on the preset
interval time. Recording will be stopped after PEL INPUT has been disabled. If the Record Interval value is 0
(zero) the recording mode is disabled.
Press the "Utility/Local" key then use the keys to select the RECORD function then the "ENTER" key.
Use the keys to select RECORD INTERVAL then press "ENTER" to display the current value. Press the
"ENTER" key to edit or enter the new value then the “ENTER” key to confirm. Press “CLEAR” key to exit
the RECORD MODE.
To review the recording data press the "3" key then use keys to retrieve the data from memory. All
data is stored in the non-volatile memory, therefore the data will not be erased even after the power to the unit
has been turned off. If the record feature is allowed to continue past 255 point, the first records will be erased.
In other words memory is wrap around only 255 recording points are stored.
RECORD CLEAR erases the data in the memory, press the "3" key first then the "Utility/Local" key to clear
all records in memory.
40 M470030-01 Rev A