52/54
MegaFlex 1000 to 1600
UPS Installation Guide / REV-A
5.2.6 X1 terminal block - AUX External Maintenance Bypass
If the UPS system is equipped with an external Maintenance Bypass Switch, it is possible to connect a NO
(Normally Open) voltage-free aux. contact from the External Bypass Switch to the programmable input X1 / 10,
21, making the UPS operate as if the internal switch “Q2 – Bypass Manual” (if provided by customer) has closed.
This function can be activated by changing a dedicated parameter (“Service Code” required).
When this NO (Normally Open) contact closes, the output Inverter Contactor K7 it is automatically opened and the
Load transfer back to Inverter will be inhibited.
In a Parallel System, the input on the Customer Interface of each unit must be connected to a
separate AUX contact of the External Maintenance Bypass Switch.
5.2.7 X1 terminal block – eBoost control signal
The UPS operation in either eBoost operating mode can be controlled via a NO (Normally Open) contact by installing
the “eBoost” signal, routed to the programmable function contacts (see Section 5.2.3).
When this contact closes, eBoost operation mode is inhibited.
The Parameter for the activation of such function is “Service Code” protected.
Contact your ABB Service Center for its activation.
This function is particularly useful for controlling eBoost operation following critical conditions on either the load
side or the input utility, including generator operation when the “GENERATOR ON” signal has not been installed.
When using the “eBoost control” function on the programmable user relays of the Customer
Interface X1 terminals in a Parallel System, a separate NO (Normally Open) contact must be
connected to each individual unit.
