Cooper Bussmann 858 - Manual (Page 20)

DOCUMENT 1025
REV. H
Instruction Manual
AGS-LED
858 LED Series
Sizes 1, 2, 3, 4 and 5
11
10.3 Measuring Input Current (Signs Without Optional Power Switch)
WARNING:
WARNING
Failure to turn off power to the sign and wait five minutes could result
in severe injury or death.
Turn off power to the sign by turning off the corresponding Constant Current Regulator (CCR) power.
(WARNING: Wait five minutes after sign power is turned off to service the sign. This will allow
any residual high voltage stored in Power Supply PCB components to bleed off. ) With your
multimeter set to DC Volts, verify that the Power Supply Output Voltage is less than 30-VDC at TP6
(Positive lead) and TP3 (Negative Lead) as indicated in Figure 22. If the Power Supply Output Voltage
is greater than 30-VDC, then you must wait until the Power Supply Output Voltage drops below 30-VDC
before you proceed with the next step.
Open Power Supply cover (See Figure 18). Disconnect female crimp receptacle at CN17 from Power
Supply Board. (Note: When removing female crimp receptacle, grasp by the terminal, not the wire.)
Disconnect female crimp receptacle from CN18 and connect to CN17. Place current clamp around
primary power wire and connect to a true rms current meter. Turn on power to the CCR. Current should
measure between 2.7-ARMS and 6.7-ARMS depending on the CCR current level or current step.
Upon completing the measurement of the input current, turn off power to the CCR. Remove the current
clamp. Disconnect the female crimp receptacle at CN17 and reconnect to CN18. Reconnect the female
crimp receptacle attached to wire BRPH to CN18. Close the Power Supply Box cover.
10.4 Measuring Input Current (Signs With Optional Power Switch)
WARNING:
WARNING
Failure to turn off power to the sign and wait five minutes could result
in severe injury or death.
Turn off power to sign by toggling sign power switch to the off position (See Figure 6). Turn off power
to the sign. (WARNING: Wait five minutes after sign power is turned off to service the sign. This
will allow any residual high voltage stored in Power Supply PCB components to bleed off. ) With
your multimeter set to DC Volts, verify that the Power Supply Output Voltage is less than 30-VDC at
TP6 (Positive lead) and TP3 (Negative Lead) as indicated in Figure 22. If the Power Supply Output