Ametek Amrel PLA 2U, Operation Manual

Page: 53 / 162

M470039-01 REV-F Page 52
LOAD WIRING LENGTH FOR OPERATION WITH SENSE LINES
For a pplica tions tha t use remote sensing, you must limit the volta ge drop a cross ea ch source line. We recommend that
you use the la rger loa d wirin g or ensure a sma ller volta ge d rop (1V typica l ma x.) a long the wire, a lthough the remote
sensing will compensa te for volta ge drops up to 1% of V
MAX
in ea ch line. Plea se see the following ta ble:
Max Rated Voltage Max Voltage Drop Compensation
100 V 1 V
200 V 2 V
300 V 3 V
400 V 4 V
500 V 5 V
600 V 6 V
700 V 7 V
800 V 8 V
TABLE 2.5 VOLTAGE DROP COMPENSATION
NOISE AND IMPEDANCE EFFECTS
To minimize noise pickup or ra dia tion, use shie lded pa ir wiring or shortest possib le length for source wires. Connect the
shield to the cha ssis via a rea r panel mounting screw. Where shie ldin g is impossib le or impra ctica l, simply twistin g the
wires together will offer some noise immunity. When using loca l sense connections, the user must use the la rgest
pra ctica l wire size to minimize the effects of loa d line impeda nce on the regula tion of the loa d.
LOAD CONNECTIONS
The electronic loa d is designed with a n a ir-cooling/wa ter-coolin g system tha t provides a irflow/wa ter flow through the
heat sink to remove the hea t generated by the Power M OSFETs. To obta in efficient hea t excha nge ra te between hea t sink
a nd power MOSFETs, the user needs to follow the instruction outlined belo w to ensure the hea t is removed from heat
sink properly to prevent excess hea t from a ccumula ting in the po we r module. Under high powe r ha ndling a pplica tions or
increa sed tempera ture opera tion, hea t dissipa tion becomes a key fa ctor in determining the relia bility of the overa ll unit.
INPUT TERMINAL
For the safety of personnel and to prevent electrical shock due to high voltage, do not come in contact or obstruct
the input terminals. Refer to the next page diagram, for the location of the input terminals.
Never touch the input terminal when your hands are wet. Dry your hands first before operate the instrument.
Observe the ma ximum current handling ca pability of the power ca bles from DUT to the Loa d Ba nk. Plea se refer to Ta ble
2.4 for higher current ra ting ca bles. Observe the ma ximum input current a nd volta ge of the termina ls. Do not underra te
the cable, excessive current will ca use the tempera ture to increa se and ca use melting of the insu la tion rubber of the
termina l a nd ca ble insula tion sleeves resulting in input ca ble shorts.
For the high current a pplica tions, la rge dia meter power ca bles a re necessa ry to prevent loa d oscilla tion. The power ca bles
should be a s short a s possible to reduce inducta nce from the power ca ble a nd ca use oscilla tion between power sources and
the loa d unit.
WARNING
WARNING