Function Message Description
11 UPS warning UPS is warning, but the UPS can still function normally
12 EPO Active Urgently power off the UPS.
13 Maintain Bypass The UPS transfers to Maintain bypass mode.
14 Over temperature warning/shutdown The temperature is too high.
15 Over Charger The battery is overcharge
16 Charger Fail The Charger is in failure
17 Fan Lock The Fan of ups is in failure
18 Line AC fail Power failure
19 Inverter Short UPS output is short
20 Negative Power There's energy being pumped back into the UPS
21 Summary Alarm Bypass mode/battery mode/bat open/bypass loss/fault/warning/line fail
The default settings are:
• Out 1: Back feed protection (Function #8)
• Out 2: Summary alarm (Function #21)
Out 1 by default is NO (Normally Open): Normally the contact is open, and when its function is active the pins OUT1 and COM1
will be internally connected.
OUT 2 by default is NO (Normally Open): Normally the contact is open, and when its function is active the pins OUT2 and
COM2 will be internally connected.
The output dry contacts are rated for max 60V DC and 1 A.
If needed, it is possible to convert the Output Dry Contacts into NC (Normally Closed) and to modify the function assigned to
each Output Port. Contact the dealer.
3.8.2 Dry Contacts Input
There are two Input Dry Contacts on MTP 20-40-80kVA.
Figure 3.66 Two Input Dry Contacts
Both of them have fixed function. In particular:
3 Operations Proprietary and Confidential ©2024 Vertiv Group Corp. 77
Vertiv™ Liebert® MTP Online UPS User Manual 20-40-80kVA
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