Overview; Features - NF DP420LS Instruction Manual

1. Outline
1.1

Overview

Programmable AC power source DP420LS/DP480LS are 42 kVA/48 kVA single phase AC
stabilized power source which inherit the performance and function of DP series and support reverse
power flow* for a short time. It is powered from three-phase 200 V AC. It provides various
interfaces such as the external control input/output, communication interface, and remote controller
to address a wide variety of usage. You can configure several products of the same model to
participate in a single-phase three-wire system (max 84 kVA/96 kVA) or three-phase four-wire
system (max 126 kVA/144 kVA) by using a System Cable (optional).
* It is to be noted that regeneration from the load is described as "reverse power flow" in this
manual. Also, it is to be noted that DC regeneration is described as "sink current" and DC power
running is described as "source current"
1.2

Features

  Various interfaces to address a variety of usage
The interface to use for the remote controlling from a computer or sequencer is equipped. USB and
RS232 interface are standard, and either GPIB or LAN (LXI 1.4) interface can be chosen when
ordering. You can use a contact/TTL signal to turn the output on/off or switch the memory without
using a computer. The product also offers the status output for showing the device status and the
output which is synchronized with Sequence or Simulation step. With these functions you can
achieve various types of systemization and automatization. The AGC function and Autocal function
for calibrating the output voltage drop are also provided.
 Sequence function
User can program a sequence to change output voltage, frequency, waveforms and so on with this
function, which provides automation of switching continuously a number of testing conditions.
 Power fluctuation test (=Simulation) function
User can simulate power line abnormalities, such as blackout, voltage rise, voltage drop, abrupt
phase change, abrupt frequency change, and so on.

 Variable current limiter
This function can limit the effective value and the positive/negative peak value of the output current
where the limiting value is variable. You can set the limiter so that the output is turned off when the
limited condition continues for a certain time.

 Short reverse power flow
This product supports the reverse power flow for 20 ms. User does not need to consult with the
power companies about power system interconnection because this product processes the reverse
power internally and does not regenerate to the power system when the reverse power flow is
occurring.
2 PROGRAMMABLE AC POWER SOURCE