Application Guide

SAG582140001 System Application Guide
Issue AN, June 4, 2014 Spec. No. 582140001 (Model 801
NLDB, 801NLEB, 801NL-B)
Page 86 of 115
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4.4.7 High Temperature Protection:
(A) When the PFC board temperature is higher than 85°C, the rectifier turns off. When
the PFC board temperature is lower than 75°C, the rectifier resumes to normal operation,
and the hysteresis is at least 10°C.
(B) When the “ambient temperature – PFC board temperature” is higher than 5°C, the rectifier
turns off. When the “ambient temperature – PFC board temperature” is lower than 2°C, the
rectifier resumes to normal operation, and the hysteresis is at least 3°C.
(C) When the DC board temperature is higher than 105°C, the rectifier turns off. When the DC
board temperature is lower than 95°C, the rectifier resumes to normal operation, and the
hysteresis is at least 10°C.
4.4.8 Fan Fault Protection: An alarm will be generated upon a fan fault. In such cases, the fault
indicator (red) on the Rectifier Module front panel will flash and the Rectifier Module will also
inhibit its output. Auto-recovery is enabled upon the clearing of the corresponding fault.
4.4.9 PFC Over/Under Voltage: The rectifier will shut down when its bus voltage is higher than the
over voltage set point or is lower than the under voltage set point. During such conditions, the
rectifier does not output any power and its protection indicator (yellow) will light up.
4.4.10 Load Sharing (via MCA): The MCA load sharing feature automatically balances the load. If the
MCA's load sharing feature is disabled for any reason, pre-programmed slope control in each
Rectifier Module balances the load. The MCA's load sharing feature is disabled whenever the
system is in current limit, the system is delivering more than 97% capacity, or the system is
delivering less than 3% capacity.
Active Load Sharing (Rectifier Module): The Rectifier Module uses advanced digital active
load sharing technology that maintains balancing to within ±3A. The difference in the average
current between rectifiers is <±3A for loads in the 10 to 100% range.
4.4.11 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.
4.4.12 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.
4.4.13 Cooling: Each Rectifier Module contains a fan for forced convection cooling.
4.4.14 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.
4.4.15 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.
4.4.16 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.
4.4.17 Paralleling: This system may be connected in parallel with any rectifier of the same polarity and
adjusted to the same output voltage.
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