key and selecting MANUAL. The FB1000 will display the last saved values for constant power mode. To switch between volts/current/power and time/volt-hours, press function key F1. To change a parameter, press the function key located to the right of the display, next to the parameter you wish to change. The FB1000 will allow a new value to be entered using the keypad numeric keys. Press the function key labeled "Enter" to complete the new setting. Press Clear to erase previous keystrokes. Press Exit to cancel entering a new value. The FB1000 will not accept a power setpoint outside of the allowed range. Press Clear to re-enter an appropriate value.
The limit parameters are normally set to the power supply maximum values. The FB1000 will not accept a limit parameter outside of the allowed range.
In addition, the FB1000 will never exceed the maximum power output specification of 250W.
Timed Operations
It is possible to enter an amount of time for the power supply to provide power, after which it will automatically shut off. Use this feature for timed runs.
Set up a constant mode setpoint and limits as described above. Enter a time duration of 0-99 hours, 59 minutes. A time duration of zero effectively disables timed run mode.
When running a timed run, the time parameter displays the time remaining in the run. When running a non-timed run, the time parameter displays the elapsed time during the run.
Volt-Hour Operations
It is possible to enter an amount of volt-hours for the power supply to provide power, after which it will automatically shut off. Volt-hours is the integration of voltage over time. Use volt-hour control to provide consistency between runs.
Set up a constant mode setpoint and limits as described above. Enter a volt-hour duration of 0- 9999 volt-hours. A volt-hour duration of zero effectively disables volt-hour run mode.
During a run, the volt-hour value displays the accumulated volt-hour value for the run.
Automatic Power-fail Restart
Automatic power-fail restart capability allows a timed or volt-hour run which is interrupted by loss of AC power to be restarted automatically, so that the total time/volt-hour programmed for the run will be met. NOTE: Loss of AC power includes switching off the unit using the power switch located at the rear of the unit. When performing timed or volt-hour runs with power-fail restart enabled, always use the front panel controls to stop a run in progress.
To enable power-fail restart, press the top function key when in the mode selection screen (MANUAL or PROGRAM). The state of power-fail restart will toggle from off to on or on to off with each keypress.
When AC power is restored during a run in which power-fail restart is enabled, the display will show "POWER-FAIL RESTART" for approximately 10 seconds indicating power-fail restart pending. During this time the output is not energized, to allow safely stopping the run (by pressing Run). After the power-fail restart pending delay is completed, the power supply output will ramp up to the setpoint value and the run will continue from that point. Any number of power interruptions can occur during the completion of a single run.
If a power-fail restart occurs during the running of a program the FB1000 will complete the interrupted step, and then advance to the next step in the program.
Programming
The FB1000 can store 9 programs, each containing 9 steps. A program step is a constant voltage, current, or power setpoint with any associated limit parameters, and most importantly a time
FB1000-2 MANUAL | Page 7 | 7608177 Rev. A 8/9/02 |