For Sales and Support, Contact Walker EMD • Toll-free: (800) 876-4444 • Tel: (203) 426-7700 • Fax: (203) 426-7800 • www.walkeremd.com
Power Dissipation
The Axiom drive dissipates power that results in cabinet heating. The
following table lists power dissipation values. Calculate the cabinet
cooling requirements using the power dissipation information and
formulae below.
NOTE:
These values do not include shunt regulator power
(regenerated power).
NOTE:
These values correspond to a drive operating at its full
continuous current rating at 100% duty cycle. As such they can be
considered as maximum or “worst case.”
PV10
28W
PV20
47W
PV30
65W
Maximum power losses are shown to help size a NEMA 12 or equiv-
alent enclosure and to ensure the required ventilation. Typical power
losses are about one-half maximum power losses.
When sizing an enclosure with no active method of heat
dissipation, the following equation approximates the size of the
required enclosure:
T = 4.08 * (Q/A) + 1.1
where:
T = Temperature difference between inside air and outside ambient
air (°F)
Q = Heat generated in enclosure (watts)
A = Enclosure surface area in ft2 = (2dw + 2dh + 2wh) / 144
d = Depth in inches
h = Height in inches
w = Width in inches
B : S P E C I F I C A T I O N S
B - 4
