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Power Supply Function

the protection (hour: minute: second) and the number of protection informa-

tion in the message queue and the total number of protection information.

Users can turn the page through the knob to view all the protection

information.

Clear the Protection

After the instrument triggers protection and generates a protection message,

you need to troubleshoot the possible cause. When the protection is resolved,

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

protection 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 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].

4.5.1 Set Over-Voltage Protection (OVP)

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

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

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

the OVP state.

Possible Cause

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

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

• The external (AC input) inputs a higher voltage.

• The power supply outputs a high voltage due to a fault.

Please avoid inputting a external voltage higher than 120% rated

value, or the instrument will be damaged.

ITech IT-M3900C Series User Manual

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