MASTERYS BC
from 15 to 20 kVA
6
IT
ALIANOENGLISH
PROBLEM SOLVING
9
The alarm messages displayed enable an immediate diagnosis.
Alarms are divided into two categories:
• alarms related to the UPS external circuits, (input mains, output mains, temperature and environment).
• alarms related to the UPS internal circuits. In this case, the corrective actions will be carried out by the After
Sales Department.
9.1 SYSTEM ALARMS.
• A02: output overload.
The power required by the loads is higher than the power available.
Check that the load is well balanced on the three phases by checking the measurements on the display. If
needed, disconnect any loads that do not need uninterruptible power.
Important!
The accepted overload time limit is defined in the technical specifications. When this time limit is exceeded,
the loads will no longer be powered by the inverter.
• A06: auxiliary mains out of tolerance.
The auxiliary mains supply exceeds the acceptable tolerance values. Possible causes are:
• No voltage or frequency present or voltage and frequency out of acceptable values (see the technical speci-
fications).
• The frequency is subject to continuous variations (typical with power supplied from an incorrectly sized GE).
• A07: temperature over the limits.
The technical plant temperature is higher than the maximum value recommended.
Check the ventilation or air conditioning system in the UPS room.
• A08: maintenance bypass activated.
The output disconnecting switch Q6 is in position 2 (maintenance bypass). The load is therefore powered
directly by mains power supply. See Chapter 7.1.4.
• A17: improper conditions of use.
This alarm does not indicate a malfunction or failure of the UPS, but an incorrect use/sizing of the system. It
is activated in the event of:
• Operation for long periods at high temperatures (battery deterioration)
• High number of overloads (wrong sizing)
• Continuous battery discharging (mains not stable)
• High number of switches onto the bypass (high impulsive loads).
• A22: input mains out of tolerance.
The input mains is not present or not sufficient (voltage and/or frequency values incorrect with reference
to the technical data); if there is no input mains outage, check if no protections upstream of the UPS have
tripped.
Check that the voltage applied and frequency values are in compliance with the values set on the mimic
panel.
Summary of Contents for Masterys MAS2BC115M+D1
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