AMETEK SGI Series - Manual (Page 36)

Installation Sorensen SGI Series
2-14 M550221-01 Rev AA
2.6 LOAD CONSIDERATIONS
This section provides guidelines for incorporating protective diode networks at
the output of the power supply to prevent damage while driving inductive loads
or loads having stored energy that could be circulated back to the power
supply.
2.6.1 Inductive and Stored-Energy Loads
To prevent damage to the power supply from inductive voltage kickback,
connect an anti-
parallel diode (rated at greater than the supply’s output voltage
and current) across the output: Connect the cathode to the positive output and
the anode to return.
Where positive load transients, such as back EMF from a motor might occur,
or stored energy is present such as a battery, a second blocking diode in
series with the output is recommended to protect the power supply.
B LOCKING AND A NTI -P ARALLEL D IODES
Ensure that the chosen components are suitably rated for the particular
inductance and energy to be dissipated. The Peak Reverse Voltage ratings
should be a minimum of 2 times the Power Supply maximum output voltage.
The Continuous Forward Current ratings should be a minimum of 1.5 times the
power supply maximum output current. A heatsink may be required to
dissipate the power caused by flow of current.
Power
Supply
Sense (+)
Sense (-)
Out (+)
Out (-)
Battery
Application
Inductive Load
Application
OR
Freewheel
Diode
Figure 2-3. Diode Connection