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Load Function

Although [On/Off] is turned off, there may be dangerous voltage at

the input electrodes. Do not touch the wiring cable or the electrode

terminals.

When protection is generated, the VFD screen displays the following

information:

• The first row shows the meter voltage and the meter current value.

• The second row shows specific protection information, such as OCP.

Clear the Protection

After the instrument triggers protection and generates a protection message,

you need to troubleshoot the possible cause. When the cause is cleared, the

VFD will still prompt the protection information. You can manually clear the pro-

tection information record through the following methods.

• Input a pulse signal to pin 1 of the rear panel P-IO to clear the protection

information.

For details, see 5.11.1 IO–1. Ps-Clear, Not-Invert.

• Press the [Esc] or [Enter] key on the front panel to manually clear the pro-

tection information.

• Connected to the host computer, the PC sends a PROTection:CLEar com-

mand to the instrument to clear the protection information.

After the protection state is cleared, you need to press the [On/Off] key on the

front panel or send the OUTPut ON command to the instrument to reopen

[On/Off].

4.3.1 Set Over-Current Protection (OCP)

Users can enable the OCP function and set the protection limit Level and pro-

tection delay time Delay. When the current (i.e., the Meter value) is greater than

this protection limit and the delay time is exceeded, the instrument will enter the

OCP state.

Possible Cause

Many reasons can cause OCP, the details are as follows:

• The set protection limit Level is lower than the current Meter value.

ITech IT8000 Series User Manual

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