Warning Code Warning Event Warning Code Warning Event
07 Over charge 36 Unbalanced inverter current
08 Low battery 3A Cover of maintain switch is open
09 Overload 3C Utility extremely unbalanced
0A Fan failure 3D Bypass is unstable
0B EPO enable 3E Battery voltage too high
0D Over temperature 3F Unbalanced battery voltage
0E Charger failure 40 Charger short circuited
42 ISO over temperature 41 Bypass loss
21 Line situations are different in parallel system 43 Bus soft start error
3.8 Dry Contact Port
3.8.1 Dry Contacts Output
There are two Output Dry Contacts on MTP 20-40-80kVA.
Figure 3.65 Two Output Dry Contacts
Both of them have programmable function.
The complete list of available functions is the following:
Function Message Description
1 Load on inverter The UPS is working normally.
2 Load on bypass The UPS is in Bypass mode.
3 Load on Battery The UPS is in Battery mode.
4 Low battery The battery voltage is low.
5 Bypass input abnormal The bypass voltage or frequency is abnormal.
6 Battery test failure Performs the battery test. The battery test fails.
7 Communication failure DSP and MCU stop communication
8 Back feed Back feed feature
9 Output overload warning/shutdown Connected load is over rated output of the UPS.
10 UPS fault Ups is in fault
76 Proprietary and Confidential ©2024 Vertiv Group Corp. 3 Operations
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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