ITech IT-M3900D Series - Set Under-Voltage Protection (UVP)

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Power Supply Function

1. Press the composite keys [Protect] on the front panel to enter the protection

menu. (1U Model)

2. Press the composite keys [Shift]+[Recall] (Protect) on the front panel to en-

ter the protection menu. (2U Model)

3. Rotate the knob to select 4. UCP (Off) and press [Enter].

4. Press the left/right key or rotate the knob to select On and press [Enter] to

enter the setting interface.

5. Set the warm-up time Warm-up, protection limit Level and delay time Delay

in sequence, and then press [Enter] to confirm.

The VFD screen returns to the Protect menu and the UCP setting (take 10S,

0.1A, 1S as an example) is displayed as follows:

PROTECT

4.UCP 10S, 0.1A, 1.000S

4.5.5 Set Under-Voltage Protection (UVP)

Users can enable the UVP function and set the instrument warm-up time

Warm-up, protection limit Level and protection delay time Delay. When the

voltage (i.e., the Meter value) is lower than this protection limit and the warm-up

time, delay time are exceeded, the power supply will enter the UVP state.

Possible Cause

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

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

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

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

How to Set

The operation steps to set UVP are as follows.