Set Uv-Test Mode (For Cbv2) - Mitsubishi Electric MELPRO S Series Operation Manual

4.6.3.

Set UV-TEST Mode (for CBV2)

The UV-TEST is use for the relay characteristic test.
In the CBV2, under/overvoltage elements are tripped when one of the phases is operated. In other words,
under/overvoltage elements operate as an OR sequence of AB-phase, BC-phase and CA-phase.
However this OR sequence interferes with a testing for the relay characteristic. It is because that an amplifier
would output a single phase under testing. For undervoltage element, other phases which not related to the
testing are interfered with the under testing phase.
This UV-TEST mode inactivates this OR sequence of each phase and enable a single-phase operation.
Table 4-1 shows the setting items of the UV-TEST.
LED Indication
For example, in case of setting "AB-phase", this protection relay focuses on "AB-phase". Even though
BC-phase and CA-phase are zero voltage, the undervoltage element doesn't operate when AB-phase is
injected beyond the setting value.
<ATTENTION>
DON'T forget the setting back to off before in-service condition.
Under the UV-TEST mode, the yellow LED of "UV-TEST" is turned on. The position of "UV-TEST" LED is
shown in Fig. 4-1
Table 4-1 LED indication for test mode (CBV2)
This value means "OFF" setting of the Test Mode in the over/under voltage
element.
This value means "AB-phase" setting of the Test Mode in the over/under voltage
element.
This value means "BC-phase" setting of the Test Mode in the over/under voltage
element.
This value means "CA-phase" setting of the Test Mode in the over/under voltage
element.
Fig. 4-1 Position of "UV-TEST" LED
Detail
"UV TEST" LED is turned on.
31 / 47 JEP0-IL9537