KEPCO KLP 10-150-1.2K, Руководство пользователя

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KLP031308
3-7
2. In the setpoint mode, both coarse (rotate the control) and fine (rotate while pressing control
in) adjustment is available. The coarse adjustment is approximately 100X the fine adjust-
ment 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. 3.2.3).
Voltage and current settings are not allowed to exceed either a) the virtual model setting or b)
80% of the protection value. Attempts to set voltage or current beyond these limits will not be
accepted. The status display shows either
>MAX
for virtual model,
>OVP
for voltage protection,
or
>OCP
for current protection to indicate which limit is being exceeded. If a fault has been con-
figured for AUTO recovery, the status display flashes
>AUTO
for one second upon leaving Set-
point mode (see PAR 3.2.13.5.2).
3.2.7.3 LAST SETTING RECALL
KLP 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 3.2.7.2); output changes entered in real-time mode
(PAR 3.2.7.1) 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 virtual model for the power supply is altered, the last settings are reset to zero
volts and minimum current.
3.2.8 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-
grammed to FAULT mode (see PAR. 3.2.13.3), 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. 3.2.6), OVP and OVC are automatically set 20%
and 20%, respectively, above the maximum programmable values established by the
virtual model. If OVP or OVC are lowered by the user, valid settings will actually be
lower than the virtual model limits because values within 20% of OVP or 20% of OVC
are prohibited.
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-