Table of Contents
Advertisement
3.9. Power Supply Output Turn-Off and Discharge Procedure
Even after the power supply AC input and/or its output has been turned off, there may be
residual charges stored in the power supply. Follow the steps below to prevent electrical
shocks.
If the power supply output is connected to an energized load, such as a
battery, then there must be a customer-supplied disconnect method, such
as an electrical contactor, which can safely disconnect the energized load
a) If the power supply output is connected to an energized load, such as a battery, then:
1. Disconnect the energized load using an electrical contactor or similar method.
Do not attempt to disconnect energized cables at the output of the power supply.
2. Set the power supply output voltage and output current settings to zero. Verify these
settings using the front panel PREView button.
3. Verify the energized load is disconnected by noting the front panel display
measurements are close to zero volts and zero amps.
b) Switch the front panel AC ON/OFF switch to the OFF position.
c) Disconnect the AC power at the source (pull the wall plug and open the circuit breaker).
d) Wait 10 seconds so any internal stored energy can discharge.
e) If installed, remove the output protection cover.
f) Apply a voltmeter across the POS and NEG output terminals to verify the output voltage is
close to zero volts.
g) Obtain a 30cm long insulated 22AWG wire with an insulated spring clip on each end.
Use caution and connect the jumper wire (short-circuit) for at least two seconds:
•
Between the POS output terminal and the chassis ground stud
(see the stud in Figure 4-2, Item 10)
•
Between the NEG output terminal and the chassis ground stud
h) The output is now completely discharged and the user may safely handle the POS and
NEG output terminals.
WARNING
from the power supply output.
34
83532002 Rev H
Advertisement
Table of Contents
