ABC Operating Instructions
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These instructions are a quick reference for understanding the operation of Kepco's
ABC power supply. More detailed information can be found in the Operator's Manual which accompanies each unit.
CONNECT THE LOAD -
The Sense terminals must be connected for the power supply to work.
For local sensing, use the links supplied on the barrier strip at the rear.
For remote sensing, remove the links and make the 4-wire connections at
your load.
CONNECT SOURCE POWER -
The power supply accepts a wide range of source power: 85-264V a-c, 47-63 Hz or 400Hz.
The POWER switch turns the unit on and off. The power supply is equipped with a
grounded North American 2-blade plug. Overseas users may substitute their
national plug; the chassis end is a standard 15A IEC connector.
LOCAL OPERATION
THE ALPHANUMERIC DISPLAY (LCD) -
Operations are done from the keypad and observed on the LCD. Optimize
LCD contrast by pressing MENU once, then press numbers until viewing is
optimum. The LCD displays the actual output voltage and current and the
operating mode: Local or Remote and constant voltage (CV) or current (CC).
and a blinking colon (:), or a blinking equal sign (=). Enter a command
when you see a blinking colon (:), enter numbers when you see a blinking
equal sign (=). Six keys have a dual function (command/number): the blinking
colon (:) or equal sign (=) tells you which key function is effective.
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USING THE KEYPAD -
Use ENTER to accept numbers entered or execute a command. Use CLEAR if you
make a mistake and don't want to change the status quo. Valid entries are
accompanied by a short beep; invalid entries by a longer buzz. (The speaker
can be disabled by pressing MENU three times and entering 0.)
OUTPUT SETTINGS -
V SET sets output voltage; I SET sets output current. Depending on the
mode (CV or CC), one setting acts as a limit, the other programs the output voltage or current.
As long as the voltage across the load produces a current that is
less than or equal to the I SET value, the unit operates in CV mode
(voltage programmed to V SET value, current limited by I SET value). If
the load resistance decreases to the point that current through the load reaches the
I SET value, the unit automatically enters CC mode (current programmed to
I SET value, voltage limited by V SET value.
The arrow keys can be used to increase or
decrease output voltage (CV mode) or current (CC mode) by the least amount
possible (approximately the maximum rating divided by 4000).
OUTPUT ON/OFF -
(ON) enables programmed output settings to appear at the output. (OFF) sets
output voltage and current to zero and the LCD reads "Output is OFF'"
RESET -
Use RESET to restore the power-on defaults (output on, V SET and I SET at
zero, OV SET and OC SET at approximately 10% above rated output).
PROTECTION -
OV SET and OC SET establish protection for overvoltage and overcurrent
conditions. If the output attempts to exceed programmed OV SET or OC SET
values, the LCD indicates which condition occurred, and the output goes
to zero. RESET or cycle the power supply off and on to recover.
CALIBRATION -
CALIB leads you through a digital calibration procedure (password protected).
The initial password is the voltage rating plus current rating (e.g., 1010 for
ABC 10-10DM). You can change it using the MENU. The previous calibration
is saved and can be restored. The original factory calibration can also be restored if desired.
(See Section 4 of the Operator's Manual.)
STORAGE LOCATIONS -
Forty locations are available to either save active settings or to establish
a local program that can be sequenced (EDIT PROG). STORE lets you save the
active programmed settings (V SET, I SET, OV SET and OC SET). Just select a
location (from 1 to 40). RECALL applies the V SET and I SET values previously stored.
LOCAL PROGRAMMING -
The same forty locations are also available for local programming. Each location
stores values for six parameters: output voltage, output current, overcurrent
protection, overvoltage protection, time duration (between 0.01 and 2.5 seconds)
for the programmed parameters, and the address of the next memory location in the
program. Local programs are set up using EDIT PROG; a MEMORY LOCATION WORKSHEET
table included in the Operator's Manual helps you to program Kepco's ABC.
Select the starting location and enter the desired values for each parameter. Use
arrow keys to scroll forward or backward to view the next parameter or memory
location. Set the last address to 0 for the program to run once and stop. If
you want the program to cycle indefinitely, set the last address to the starting
address. After all parameters have been entered, use CLEAR or ENTER to exit EDIT
PROG mode. To run the program one step at a time, press STEP, select a starting
location, then press STEP to execute the next step. To run the program, press
RUN and select the starting location. If the program is designed to cycle, press
CLEAR or RESET to stop it. The TIME key offers a quick and easy way to change the
time for any memory location without entering EDIT PROG mode.
MENU FEATURES -
Press MENU to scroll through the MENU functions. Press CLEAR to exit, enter
number(s) and press ENTER to change a feature. The following features are included:
- Set LCD contrast: set from 1 to 9 for optimum viewing.
- Set GPIB address select: Set from1 to 30
- Set speaker on/off: 0 to disable beeps and buzzes, 1 to enable.
- Change password (required for calibration): Enter old password, then the new password.
- Restore previous calibration values: (See Section 4 of Operator's Manual.)
- View Model number, Serial number and firmware version (not changeable)
- Set maximum values for V SET and I SET:
To prevent damage to a sensitive load the maximum output voltage and current can be
reduced from the rated value to a user-selected maximum.
- Delay protection:
To allow for large initial transients (e.g., from inductive loads), overvoltage
and overcurrent protection can be delayed about 8 seconds by entering a count (count
of 30 is about one second, maximum count is 255). If an overvoltage or overcurrent condition
is still present at the end of the delay, protection trips the power supply off.
- Control LCD during local program execution:
(0) displays **Running Program** and (1) displays voltage/current measurements while a local program is running. When
set to (1), the actual time duration of each step will be slightly shorter than the
programmed value because the internal processor requires time to display the values
on the LCD. Set to (0) for accurate time durations.
