21
4.5 SETTING THE PROTECTION MODES
The power supplies have overvoltage protection (OVP) and overcurrent protection (OCP) features to guard against
abnormal operating conditions. When either of these two functions are activated, the unit disables the output. The
LCD annunciator will indicate the condition and an audible signal will sound.
4.5.1 SETTING THE OVERVOLTAGE THRESHOLD
To locally program the threshold voltage press "OVSET", enter the value and press "ENTER". For example, to
program an overvoltage value of 4.50V, press:
OVSET UTILITY
4 4
••
5 0 ENTER
4.5.2 ENABLING / DISABLING OVERVOLTAGE PROTECTION
In all models, the user can enable or disable the OVP circuit by pressing the "OVP/4" key. When enabled the OVP
annunciator is on.
When the OVP annunciator is blinking, the overvoltage protection circuit has been activated and disabled the
output. An audible signal will also sound. To reset, Press the "OVP/4" key and the annunciator will stop blinking.
Turn the output on and press the "OVP/4" key again.
<NOTES:>
When remote sensing, take into consideration the voltage drop across the load leads since
the threshold measurement is taken at the output terminals.
In inductive load applications, a high-surge voltage would enable the OVP circuit and
disable the output.
Also note the programming resolution and programming accuracy specifications
When the OVP circuit is disabled, the threshold voltage becomes invalid.
4.5.3 ENABLING / DISABLING OVERCURRENT PROTECTION
To enable the overcurrent protection circuit, press the "OCP/5" key and the OCP annunciator is turned on. To
disable the overcurrent protection, press the "OCP/5" key again and the annunciator is turned off.
When the OCP annunciator is blinking, the overcurrent protection circuit has been activated and disabled the
output. An audible signal will also sound. To reset, Press the "OCP/5" key and the annunciator will stop blinking.
Turn the output on and press the "OCP/5" key again.
<NOTE:>
If OCP is on and the constant current mode ( CC ) is activated, the power supply output is
disabled.
4.6 ENABLING / DISABLING OUTPUTS
All models of the PPS series have the capability of disabling their outputs to have their setting parameters
modified. Once the modification has been completed, one can enable the power supply to operate at the new values.
To Next Page
Loading...