Vertiv | NetSure Rectifier Module User Manual (UM1R483500e) | Rev. R
INTRODUCTION
Overview
The rectifiers provide load power, battery float current, and battery recharge current during normal operating
conditions. The rectifiers are a constant power design. The rectifiers are rated at their 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 4000 W, 3500 W, or 3200 W (depending on rectifier model).
Within these ranges, the rectifiers operate 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, rectifiers continue to operate but at derated output power levels.
• Constant Voltage Mode: For any initial output voltage setting from 42 VDC to 58 VDC, 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 4000 W,
3500 W, or 3200 W (depending on rectifier model).
• Constant Power Mode: As load increases above approximately 4000 W, 3500 W, or 3200 W (depending
on rectifier model) (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
NOTE!
A current limitation can be set by the User and the output voltage level is set through the
controller.
DC Output Ratings
• Voltage: Nominal -48.0 VDC, Positive Ground.
a) Adjustment Range: The output voltage can be set within the range of -42 VDC to -58 VDC,
adjustable via the controller.
• Output Power and Current:
a) Spec. No. 1R484000e, Model R48-4000e: 4000 W, maximum (69.0 A @ -58 VDC to 83.3 A
@ -48 VDC).
b) Spec. No. 1R483500e, Model R48-3500e: 3500 W, maximum (60.3 A @ -58 VDC to 72.9 A
@ -48 VDC).
a) Spec. No. 1R483200, Model R48-3200 and Spec. No. 1R483200e, Model R48-3200e: 3200 W,
maximum (55.2 A @ -58 VDC to 66.6 A @ -48 VDC).
• Output Characteristics: Refer to Figure 1, Figure 2, Figure 3, and Figure 4 for graphs of rectifier output
voltage vs. output current.
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