Ametek Amrel PLA 2U, Operation Manual

Page: 55 / 162

M470039-01 REV-F Page 54
REMOTE SENSE CONFIGURATION
Turn off the electronic load before making any connections on the rear panel terminal block.
In remote sense opera tion, the electronic loa d senses the input a t output termina ls of the source. As shown in figure 2 .4,
the remote sense termina ls of the Load a re connected to the output of the source. Remote sensing compensates for the
volta ge drop in a pplica tions tha t require long lea ds. It is useful in a ny opera ting mode requirin g a ccura te volta ge rea d
ba ck. Loa d lea ds should be bundled or tied together to minimize inducta nce.
Note: Use the largest gauge size, lowest inductance and shortest possible length for the sources line.
FIGURE 2.4 REMOTE SENSE CONFIGURATIONS
PARALLEL CONNECTIONS
The electronic loa ds can be connected in pa ra lle l to increa se power dissipa tion a nd a llow current sha ring. Numerous
Electronic Loa ds can be directly pa ra lleled in CC or CRM or CP mode, with the proper setup a nd configura tion. Pa ra llel
operation in a ll opera ting modes is recommended when using the externa l control port to send in a n in-sync externa l
control signa l. By utilizin g a n externa l control signa l a nd ensuring a ll eLOAD a re identica l in model, opera ting ra nge a nd
mode; synchronized pa ra llel eLOAD opera tion ca n be a chieved, providing optim ized performance a nd results. As a rule
of thumb, pa ra llel Loa d Bank opera tion is for current sha ring a mongst a number of loads, to ea se the overpower
restrict ions of a sin gle loa d. In short, pa ra llel opera tion increa ses the power ha ndling ca pability for high current a nd high
volta ge applica tions. Ea ch Electronic Loa d will d issipa te the power it ha s been progra mmed for. If two Electronic Loa ds
a re connected in pa ra llel, with Loa d 1 programmed for 10 A a nd Loa d 2 programmed for 15 A, the tota l current dr a wn
from the source is 25 A. In a nother scena rio, if Loa d 1 is pro gra mmed for 0.5 ohm a nd Loa d 2 is progra mmed for 0.5
ohm, the tota l equiva lent resista nce of the two pa ra lle led Loads is 0.25 ohm. eLOAD (with firmwa re version 2.86 or
la ter) offers a n a dva nce control of pa ra llel opera tion; plea se refer to Appendix B section 11 for “Ma ster-Sla ve Pa ra llel
Operation” step-by-step procedures and important details.
CAUTION
DC Power Supply
_
+
PROGRAMMING
ELECTRONIC LOAD
–
(-) Sense Pin – 2 at External Programming Port
+
(+) Sense Pin – 1 at External Programming Port