KEPCO KLR Series User Manual - Manual (Page 49)

KLR091313
3-9
Voltage and current settings are not allowed to exceed either a) the limit model setting or b)
83.3% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. The status display shows either >MAX for limit model limits, >OVP for voltage protec-
tion, or >OCP for current protection to indicate which limit is being exceeded.
3.2.10.2 SETPOINT ADJUSTMENT
Tap either the VOLTAGE or CURRENT control to initiate setpoint adjustment (status display
reads SET). The previous setpoint is visible on the corresponding DC VOLTS or DC AMPERES
display.
1. Rotate the corresponding control to change the setpoint as viewed on the corresponding
LED display. If you decide not to change the setting after rotating the control, the previous
setpoint value is restored after approximately 20 seconds. Tap either adjustment control
again to accept the displayed setting.
2. In the setpoint mode, both coarse and fine adjustment are available (see PAR. 3.2.4 to set
coarse/fine preference). The coarse adjustment is approximately 100X the fine adjustment
resolution.
Setpoint adjust can be done with output either on or off, however the output can not be enabled
while setpoint is active (See PAR. 3.2.5).
Voltage and current settings are not allowed to exceed either a) the limit model setting or b)
83.3% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. The status display shows either >MAX for limit model, >OVP for voltage protection, or
>OCP for current protection to indicate which limit is being exceeded. If a fault has been config-
ured for AUTO recovery, the status display flashes >AUTO for one second upon leaving Setpoint
mode (see PAR. 3.2.17.3.2).
3.2.10.3 LAST SETTING RECALL
KLR is capable of saving the last setpoint values for voltage and current prior to unit shutdown,
and recalling them when the unit is next turned on. Enable this function prior to power-up by set-
ting Analog I/O Switch 3 to the ON (down) position (see Table 2-2 and Figure 2-2). Upon next
power-up, each setpoint entry for voltage and current is stored in non-volatile memory, with lat-
est settings displacing prior ones. When the power supply is turned off, the last settings are
saved and automatically retrieved at next power-up as the starting setpoints. Note that this func-
tion applies to setpoint entries only (PAR 3.2.10.2); output changes entered in real-time mode
(PAR 3.2.10.1) are not saved. To disable this function, turn the unit off and set Analog I/O Switch
3 to the OFF (up) position; at next power-up, the stored value buffer is cleared and setpoints will
default to zero volts and minimum current.
NOTE: If the limit model for the power supply is altered, the last settings are reset to zero volts
and minimum current. Last output state (ON or OFF) is not retained; upon restart the
unit defaults to setpoint mode. See AUTOmatic fault recovery mode (PAR. 3.2.17.3.2).
3.2.11 VIEWING/CHANGING OVERVOLTAGE OR OVERCURRENT PROTECTION VALUES
Overvoltage and Overcurrent protection values can be individually programmed. The range for
overvoltage and overcurrent values are 0.2 to 1.2 x E
O
max and 0.72 to 1.2 x I
O
max. If the out-
put voltage/current exceeds the overvoltage/overcurrent protection value, the protection circuit
latches the output off, flashes an overvoltage (OVP) or overcurrent (OCP) protection error mes-
sage on the status display and sets a status bit that can be retrieved through the RS 232, GPIB
or LAN port. The unit must be cycled on and off to restore the output. If the internal relay is pro-