Atec 63800 User Manual
PROGRAMMABLE AC/DC ELECTRONIC LOAD
MODEL 63800 SERIES
Ch ro ma 's 638 00 Se ri es A C/ DC El ec tr on ic
Loads are designed for testing uninterruptible
po wer supp li es( UP S), Off-Gr id Inv erter s,
AC sources and other powe r de vices such
as s wit che s, circ uit b rea ker s, fuse s and
connectors.
The Chroma 63800 Loads can simulate load
conditions under high crest factor and varying
power factors wi th real time compensation
even when the voltage waveform is distorted.
Th i s spec i al f eat u re p rov i des rea l wor ld
si mul ati on capa bi lit y an d prev ent s over -
stressing thereby giving reliable and unbiased
test results.
The 63800's state of the art designed us es
DSP technology to simulate non-linear rectified
loa ds in a un i que R LC op era t ion m ode .
This mode improves st ab il it y by detectin g
the impedance of the UUT and dynamically
ad justi ng the load' s con tro l ban dw idt h to
ensure system stability.
Com prehensive measurement s allow users
to m onitor the outpu t pe rformance of UUT.
Additionally, voltag e & curr ent si gnals can
be routed to an oscilloscope through analog
out p u t s. Th e ins t r u ment ' s GPI B / R S23 2
inter face opti ons pr ovide remote contro l &
monitor for syst em integration. In addition,
built-in digital outputs may be used to control
ex te rnal relay s f or short circuit (cr ow ba r)
testing.
Chroma's 63800 Loads also feature fan speed
co ntr ol ens ur ing low acou st ic n oise. Th e
diagnosis/p rotection funct ions in clude self-
diagnosis routines and protection against over-
power, over-current, over-voltage and over-
temperature.
Programmable
AC/DC Electronic load
MODEL 63800 SERIES
Key Features :
■ Power Rating : 1800W, 3600W, 4500W
■ Voltage Range : 50V - 350Vrms
■ Current Range : Up to 18Arms, 45Arms
■ Peak Current : Up to 54A, 135A
■ Parallel / 3-Phase Function
■ Frequency Range : 45 to 440Hz, DC
■ Crest Factor Range : 1.414 to 5.0
■ Power Factor Range : 0 to 1 lead or
lag (Rectified mode)
■ CC, CR, CV, CP for DC Loading
■ Constant & Rectified Load Modes
for AC Loading
■ Analog Voltage & Current Monitor
■ Timing Measurement for Battery,
UPS, Fuse and Breaker tests
■ Measurement : V, I, PF, CF, P, Q,
S, F, R, Ip-/+ and THDv
■ Short circuit simulation
■ Full Protection : OP, OC, OV and
OT protection
■ GPIB & RS-232 interfaces
Complete AC & DC Load Simulations
Chroma's 63800 AC/DC Electronic Load is designed for both AC & DC Load Simulations. Illustrated below are the various load modes
which are available:
Model 63800
AC Load Simulation DC Load Simulation
Constant Load Modes
Rectified Load Modes
CR Mode
CC Mode
CC Mode
RLC Mode
CV Mode
CR Mode
CP Mode
CP Mode
CP Mode
Inrush Mode
Rectified Mode
AC Load Simulation
The Model 63800 AC/DC Electronic Load provides two unique operating modes for AC load simulation; (1) Constant Load Modes and
(2) Rectified AC Load Modes. Each are described below.
Constant Load Modes
The Constant Load Modes allow users to set the following operating
modes : CC, CR and CP mode. The CC & CP modes in this category
allow users to program PF or CF, or both. For CR mode the PF is
always set to 1.
When both the PF & CF of the loading current are programmed,
the 63800 load controls power factor from 1 to 0 by shifting the
current (with CF defined) relative to the input voltage to get desired
displacement power factor. The power factor range will be limited
based on crest factor programmed. If the programmed PF is positive
then the current will lead the voltage waveform, in opposite, when PF
is set negative, the current will then leg the voltage waveform. (See
below)
PF
CF
I
Figure 1: Crest Factor vs. Power Factor control Range
CFI = I peak / I rms
PF = True power / Apparent power
As seen in Figure 1, for a crest factor of 1.414, the programmed power factor can only be 1 if the input voltage is sine-wave. However, for a CF
of 2.0, the acceptable PF ranges from 0.608 to 0.85; for CF = 3, the PF can then be set from 0.211 to 0.6, etc. So, higher crest factors enable
wider range of power factors.
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