KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 47)

KLP073008
3-7
age/current exceeds the overvoltage/overcurrent protection value, the protection circuit latches
the output off, flashes an overvoltage (OVP) or overcurrent (OCP) error message on the status
display and sets a status bit that can be retrieved through the RS 232 or GPIB port. The unit
must be cycled on and off to restore the output. The N.O. and N.C. contacts of the relay provide
status flags via the Analog I/O port connector. The maximum values are 1.2 x E
O
max for over-
voltage protection, and 1.2 x I
O
max for overcurrent protection.
A built-in feature prevents the unit from being programmed within 20% of OVP or 20% of OVC.
For example, if OVP and OVC are set to 12V and 72A, respectively, programming of the output
is automatically limited to 10V and 60A.
NOTE: When a virtual model is defined (PAR. 3.2.5), OVP and OVC are automatically set 20%
and 20%, respectively, above the maximum programmable values established by the
virtual model.
The OVP and/or OVC limits can be changed as follows:
1. Using a thin tool (e.g., end of paper clip), press and hold the PROTECT switch. The output is
switched off, setting voltage to zero Volts, and current to a minimal value, and the status dis-
play shows PROT. The DC VOLTS and DC AMPERES displays show the corresponding
overvoltage and overcurrent protection setpoints while the PROTECT switch is held in.
2. To change the values, operate the corresponding adjustment control while holding the PRO-
TECT switch in. When the PROTECT switch is released, the protection values showing in
the DC VOLTS and DC AMPERES displays are entered as the new protection values.
NOTE: If either adjustment exceeds maximum programmable volts or amps, or if the adjustment
is within 20% of OVP or 20% of OCP, the status display will show >MAX.
3.2.8 CHANGING GPIB ADDRESS
The factory default GPIB address is 6. To change the address from the front panel proceed as
follows:
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads ADDR; the active GPIB address is visible in the DC AMPERES display. To
change the address, proceed to step 2.
3. Rotate the CURRENT control to change the GPIB address.
4. Tap the DC OUTPUT switch to accept the displayed GPIB address. The unit advances to the
next function, Baud Rate, see PAR. 3.2.9.
3.2.9 CHANGING RS232 BAUD RATE
The factory default RS232 baud rate is 9600. To change the baud rate from the front panel pro-
ceed as follows:
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)