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Designers Manual
Advanced Energy CoolX600 Series
For example, a CmC module is adjustable from 15 V to 28 V, its I
max
is 8.33 A, and
its power rating is 200 W.
• At 24 V, the module can deliver 8.33 A continuously (that is, 200 W).
• At 28 V, the module can still deliver 200 W, which equates to 7.14 A continuous
current.
R
REEM
MO
OTTEE SSEEN
NSSEE
Remote sensing can be used to compensate for voltage drops in output leads, and is
available on all modules via the J3 sense connector. Refer to
Figure 6
‑
12
on page 6
‑
6.
☞
Important
Remote sensing is not available on dual modules.
Remote sensing is implemented by connecting pin 1 (positive sense) on J3 to the
positive side of the remote load and pin 2 (negative sense) on J3 to the negative side
of the remote load. The maximum line drop that remote sensing can compensate for
is 0.5 V. However, remote sensing cannot cause the maximum module voltage to be
exceeded at the output terminals. Observe the following precautions when using
remote sensing:
• Use separate twisted pairs for power and sense wiring.
• Route the sensing leads to prevent pickup, which might appear as ripple on the
output.
• Never disconnect the output power rail with the sensing still connected to the
load.
In certain applications where there is a high dynamic impedance along the power
leads to the sensing point, remote sensing might cause system instability. This system
problem can be overcome by using resistors in the sense leads (positive sense lead:
R1 = 10 Ω, negative sense lead: R2 = 10 Ω) and local AC sensing (using 22 μF
capacitors between the remote sense pins and the output terminals).
The resistance of the power cables (R
cable
) must be such that the voltage drop across
the cables is less than 0.5 V (to ensure remote sensing operates correctly).
R
cable
< 0.5
I
out
For example, the R
cable
for a CmA module, 5 V/21 A, must be less than 23.8 Ω.
M
MEEAASSU
UR
REEM
MEEN
NTT O
OFF R
RIIPPPPLLEE AAN
ND
D N
NO
OIISSEE
It is important to use the correct method to measure ripple and noise. Take care to
prevent forming a loop antenna with the tip and ground lead of the oscilloscope
probe. Such a loop would cause erroneous readings from pickup of remnant radiation
near the output connectors. Advanced Energy recommends that you use an x1 probe
with the ground sheath of the probe tip used for ground connection.
Advanced Energy
®
CoolX
®
600 Modular Power Supply
57010208-00B
Installation, Setup, and Operation
6‑24
