Introduction
1-6 Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4 www.eaton.com/powerquality
1.2.6 Additional Output Surge Protection
The Eaton 93PM UPS complies with ANSI 62.41 for line surges. However, if added security is required an
additional Surge Protection Device (SPD) can be installed. For this application, a 480V Delta Style SPD Type 1
or Type 2 installed on the load side is recommended. The SPD must meet the Maximum Continuous Operating
Voltage (MCOV) for a 480V Delta Style SPD. Eaton offers a variety of SPD solutions including the Eaton SPD
Series with various kA ratings options.
1.3 Battery System
The battery system provides emergency short-term backup power to safeguard operation during brownouts,
blackouts, and other power interruptions.
1.3.1 Battery Configurations
The Eaton 93PM–50 UPS battery system can be internal to the UPS cabinet, can be external Integrated Battery
Cabinets (IBCs), or both. Internal batteries are not available when a redundant module is installed. The external
IBCs are connected in parallel with the internal batteries to provide extended run time. The battery system is
equipped with sealed lead-acid, maintenance-free batteries.
External IBCs are available at 480V (240 cell). Internal batteries are available at 480V (240 cell).
An external battery disconnect switch or tie point must be used when IBCs are located separate from the UPS
cabinet and wiring exceeds the number of battery terminals available.
A supplemental 48 Vdc shunt trip signal for an external battery disconnect device (IBCs only) is provided by the
UPS, but is not required for normal operation.
1.3.2 Optional Thermal Sensor
Thermal runaway protection for VRLA batteries can be provided by adding an optional thermal sensor to the
internal battery section or external battery cabinet.
The sensor is wired to the thermal sensor terminal and programmed to turn the charger off when a trip signal
is received.
The thermal sensor will maintain the trip state until it is reset by service. Service should be called to inspect the
batteries and reset the sensor in case of such an event.
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