Introduction; Overview; Specifications; Dc Output Ratings - Vertiv NetSure R48-3000e3 User Manual

INTRODUCTION

Overview

The rectifier provides load power, battery float current, and battery recharge current during normal
operating conditions. The rectifier is a constant power design. The rectifier is rated at its maximum
output power. This means that, within the normal operating ambient temperature range and input
voltage range, the maximum available output power is a constant 3000W. Within these ranges, the
rectifier operates in one of three modes, depending upon load demands. Transition between
modes is completely automatic. If ambient temperature rises above or input voltage falls below
acceptable values, the rectifier continues to operate but at derated output power levels.
• Constant Voltage Mode: For any initial output voltage setting from 42 to 58 volts, output
voltage remains constant regardless of load. This is the normal operating condition, in which
loads are being supplied and batteries are float charged. Rectifiers operate in the Constant
Voltage Mode unless load increases to the point where the product of load current and
output voltage is approximately 3000W.
• Constant Power Mode: As load increases above approximately 3000W (non-adjustable),
output current continues to increase, but output voltage decreases as required to maintain
constant output power. Rectifiers operate in the Constant Power Mode unless load
continues to increase to the point where the current limit setting is reached.
• Constant Current Mode: If load increases to the current limit setting, output voltage
decreases linearly to maintain output current at the current limit setting.

Specifications

DC Output Ratings

NOTE! A current limitation can be set by the User and the output voltage level is set through
the controller.
• Voltage: Nominal -48 volts DC, positive ground. Output voltage is adjustable from -42 to -58
volts DC via the associated Controller.
• Output Power and Current: 3000W (62.5A) @ 208/220/230/240VAC input and -48VDC
output.
• Output Characteristics: Refer to Figure 1 for a graph of output voltage vs. output current.
Figure 1: Output Voltage vs. Output Current
• Power Derating Based on Input Voltage: The rectifier power varies with changes in input
voltage and output voltage. It uses an advanced power limitation method. The lower input
Vertiv | NetSure Rectifier Module User Manual (UM1R483000e3) | Rev. 1.0 6