Electronic
Figure 3.50 Electronic Setting Screen 1
1. Output VOL: Select the output rated voltage.
a. When UPS is HV system, there are four options, 208V , 220V ,230V and 240V.
b. When UPS is LV system, there are two options, 120V and 127V.
2. Output FRE: Select output rated frequency.
a. 50Hz: The output frequency is setting for 50Hz.
b. 60Hz: The output frequency is setting for 60Hz.
3. CVCF Mode (constant voltage and constant frequency function)
a. Enable: CVCF function is enabled. The output frequency will be fixed at 50Hz or 60Hz according to setting
of “Output Freq.”. The input frequency could be from 46Hz to 64Hz.
b. Disable: CVCF function is disabled. The output frequency will synchronize with the bypass frequency
within 46~54Hz for 50Hz system or within 54~64Hz for 60Hz system. Disable is the default setting.
4. Bypass Forbid:
a. Enable: Bypass Forbid is enabled. It’s not allowed for running in Bypass mode under any situations.
b. Disable: Bypass Forbid is disabled. UPS will run in Bypass mode. It is the default setting.
5. Neutral Line Check: Check if neutral line is correctly connected or not.
a. Disable: Disable the neutral loss detection function. The UPS will not detect the neutral loss or not.
b. Auto: The UPS will automatically detect the neutral is lost or not. If neutral loss is detected, an alarm will be
generated. If the UPS is turned on, it will transfer to battery mode. When neutral is restored and detected,
the alarm will be muted automatically and the UPS will go back to normal mode automatically.
c. Check: The UPS will detect the neutral loss or not only when first commission. If neutral loss is detected, an
alarm will be generated. If the UPS is turned on, it will transfer to battery mode. When neutral is restored,
the alarm will NOT be muted automatically and the UPS will NOT go back to normal mode automatically.
Make sure to enter this selection and restart the UPS again to mute alarm.
6. ISO Compensation:
When UPS is connected to output isolation, it will compensate the output voltage.
3 Operations Proprietary and Confidential ©2024 Vertiv Group Corp. 59
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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