Vertiv
™
NetSure
™
-48 VDC Power System
System Application Guide
Spec. No: 582140001
Proprietary and Confidential © 2022 Vertiv Group Corp.
SAG582140001
Model No: 801
NLDB
, 801
NLEB
, 801
NL
-
B
Page 74
Revision T, September 28, 2022
3.4.11
Startup Time: The Rectifier Module has two startup modes:
(A)
Normal Soft Start Time: The duration from the time when the rectifier is powered on to the time when the
rectifier provides output voltage is
<
8s.
(B)
Current Walk-In: The rise time of the rectifier output voltage is
>
8s at 90% of the rated load, and the
maximum time is 90s at 100% of the rated load.
3.4.12
Hot Swappable: The Rectifier Module is designed to be plug-and-play. The Rectifier Module can be inserted
or removed from a live DC power system with no damage. When the Rectifier Module is plugged into the
system, the system output voltage will not be affected.
3.4.13
Cooling: Each Rectifier Module contains a fan for forced convection cooling.
3.4.14
Fan Control: When the PFC bus voltage is within a normal range, the built-in processor adjusts the fan’s speed
according to the Rectifier Module’s internal temperature and output current. For example, a higher
temperature or output current will increase the fan speed. Above 45°C at full load, the fan operates at full
speed. When the PFC bus voltage is abnormal, such as very low bus voltage, the fan turns off.
3.4.15
Communication Failure: The Rectifier Module’s protection indicator (yellow) will flash should it experience a
communication failure. The failure information will be reported to the Controller and the Controller will process
the failure accordingly. During a communication failure, in order to protect the battery, the Rectifier Module
output voltage will automatically adjust to 53.5 V (this is a default value which can be modified using the
Controller). The Rectifier Module will revert to normal operation once normal communication is restored.
3.4.16
Unbalance of Rectifier Module Output Current: When the output current of the Rectifier Modules in a DC
power system is unbalanced, the Rectifier Module having the unbalanced output current will be identified
automatically and its protection indicator (yellow) will turn on.
The failure information will be reported to the Controller and the Controller will process the failure accordingly.
3.4.17
Paralleling: This system may be connected in parallel with any rectifier of the same polarity and adjusted to
the same output voltage.