KEPCO KLN 750W Series, Firmware Version 1.60 to 1.6x - Manual (Page 43)

KLN 750W 032614
3-7
3.3.1.1 FRONT PANEL LOCKOUT
To prevent unauthorized setting of the power supply, KEYLOCK can be enabled which disables
the front panel keys and the encoder.
Press SHIFT key to enter SHIFT mode ( LED lit), then tap the encoder to enable KEYLOCK.
The yellow indicator goes on and all the front panel keys (except SHIFT) and the encoder
are disabled.
To exit KEYLOCK tap the encoder while in SHIFT mode ( LED lit).
3.3.2 SET VOLTAGE OR OVERVOLTAGE PROTECTION (OVP)
The maximum setting for voltage is 110% of rated voltage and cannot be adjusted to exceed the
OVP setting. The maximum setting for OVP is 110% of rated voltage and cannot be set to less
than the programmed value of V. See PAR. B.25 and B.29 for SCPI commands.
1. Verify Output Mode set to ENTER (see PAR. 3.3.8)
2. To set voltage, press V/OVP (V set) key. To set OVP, first press SHIFT key (blue LED
goes on), then press V/OVP key.
3. The right-most digit blinks. Rotate the encoder to change the value. Tap the encoder to go to
the next digit. When adjustment is complete, press ENTER to confirm.
3.3.3 SET CURRENT OR OVERCURRENT PROTECTION (OCP)
The maximum setting for current is 110% of rated current and cannot be adjusted to exceed the
OCP setting. The maximum setting for OCP is 110% of rated current and cannot be set to less
than the programmed value of A. See PAR. B.10 and B.12 for SCPI commands.
1. Verify Output Mode set to ENTER (see PAR. 3.3.8)
2. To set current, press A/OCP (A set) key. To set OCP, first press SHIFT key (blue LED
goes on), then press A/OCP key.
3. The right-most digit blinks. Rotate the encoder to change the value. Tap the encoder to go to
the next digit. When adjustment is complete, press ENTER to confirm.
3.3.4 OVP/OVC OPERATION AND RECOVERY
If the unit detects an overvoltage or overcurrent condition, the OVP or OCP indicator and the red
ALARM indicator on the front panel light, the unit starts beeping and the output is set to OFF
(output voltage and current are zero). To recover, recycle power by turning the unit off then on:
the unit power up with output off, no beeps and OVP/OVC indicator not lit. Before turning the
output ON, either 1) programmed voltage or current must be reduced, or 2) OVP or OCP setting
must be increased; otherwise the unit will again detect OVP or OVC condition resulting in output
OFF, unit beeping and OVP or OVC indicator lit. Note that OVP and OCP can not be set to less
than the programmed value for voltage and current respectively, and voltage and current can
not be programmed to be higher than the OVP and OCP setpoint, respectively.
CAUTION: The unit may detect OVP or OCP if voltage/current is programmed very close to
the OVP/OCP limits. For this case, changing the settings as outlined above is
acceptable. However, detection of OVP/OCP normally indicates a malfunction,
either in the load, or in the KLN power supply itself, therefore the cause of the mal-
function should be determined before setting the output to ON.