Vertiv™ NetSure™ IPE Series -48 VDC Outdoor Rectifier Installation and User Manual
Proprietary and Confidential © 2022 Vertiv Group Corp.
5
1.4
Rectifier Overview
The rectifier provides load power 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 2000 W. 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 VDC to -58 VDC (factory set at -56.4 VDC),
output voltage remains constant regardless of load. This is the normal operating condition, in which loads are being
supplied. The rectifier operates in the Constant Voltage Mode unless load increases to the point where the product of
load current and output voltage is approximately 2000 W.
•
Constant Power Mode: As load increases above approximately 2000 W (non-adjustable), output current continues to
increase, but output voltage decreases as required to maintain constant output power. The rectifier operates 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.
•
Fold Back: The fold back function is necessary to protect the rectifier against excessive load. The rectifier will deliver
maximum current of 41.7 A down to 42 VDC output. If the load demand exceeds 41.7 A, the rectifier output will "fold
back", reducing the voltage as shown in Figure 1.1 so as to limit the current and protect the rectifier. (The dotted line in
Figure 1.1 represents the Fold Back.)
1.5
Rectifier Specifications
The specifications are for a single unit only, unless otherwise noted.
1.5.1
DC Output Ratings
1.
Voltage: -42 VDC to -58 VDC, positive ground. Output voltage is factory set at -56.4 VDC.
2.
Output Power and Current: 2000 W (41.7 A) @ 200 VAC to 250 VAC input and -48 VDC output.
3.
Output Characteristics: Refer to Figure 1.1 for a graph of output voltage vs. output current.
4.
Power Derating Based on Input Voltage: The rectifier power varies with changes in input voltage. It uses an advanced
power limitation method. The lower input threshold is 85 VAC. The rectifier can provide its maximum rated power
(2000 W) as long as the input voltage is within the range of 176 VAC to 300 VAC. Below 176 VAC, and down to 85 VAC,
the rectifier will continue to operate normally but will be in a power derating mode. Between
85
VAC
and
176
VAC
the
output
power
derating
linearly
based
on
the
input
voltage
as
follows:
-
At input voltage of 85 VAC with output >48 VDC, maximum output power is 1000 W.
-
At input voltage of 176 VAC with output >48 VDC, maximum output power is 2000 W.
The relationship between the output power and input voltage is illustrated in Figure 1.2.
5.
Power Derating Based on Temperature: The rectifier delivers full power when operating at an ambient temperature of
+55 °C (+131 °F) or below. The rectifier continuously monitors the ambient temperature surrounding the power
conversion circuit. If this temperature for any reason (such as a high ambient temperature) increases above
approxi55 °C (+131 °F), the rectifier will not shut down. Rather, the rectifier limits its maximum output power to
maintain the temperature limit of the rectifier. Operation b55 °C (+131 °F) and +75 °C (+167 °F) will result in
output power being decreased. Full power capability is restored when the temperature decreases to below
approxi55 °C (+131 °F). Refer to Figure 1.3 to view the relationship between the output power and the ambient
temperature.
