Cooper Bussmann 858 - Manual (Page 24)

DOCUMENT 1025
REV. H
Instruction Manual
AGS-LED
858 LED Series
Sizes 1, 2, 3, 4 and 5
15
second LED MODULE and the cable from the first LED MODULE to the second LED MODULE are
operating normally.
Turn off main power to the sign. Wait five minutes for the high voltage to dissipate. Verify that the
output voltage is less than 30-VDC with a multimeter as described in the opening paragraph of this
section. Replace the black return cable connector with the first LED MODULE output cable connector.
Replace the black return cable connector in the output connector housing of the last LED MODULE.
If the sign does not light at all, then replace the second LED MODULE and/or the cable connecting from
the output connector of LED MODULE #1 to the input of LED MODULE #2 (see Section 10.10). Then
repeat the test outlined above in this section.
10.9 Continue Checking the Rest of the LED MODULES
It is assumed that the first two LED MODULES have been checked successfully as described in previous
two sections. For signs with more than two LED MODULES, continue checking the remaining LED
MODULES one at a time and in numerical sequence (e.g. LED MODULE #3, LED MODULE #4….LED
MODULE #Last). Use the same method as we have outlined in previous section.
For example, suppose we have a sign with 6 LED MODULES (See Size 2, 2-Modules, Figure 9) and we
have checked all the LED MODULES in sequence from 1 to from 4 and found that the sign momentarily
lit. Then we would use the following procedure to test the 5th LED MODULE.
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.
Remove the black return cable connector from the 6th LED MODULE output cable. Replace the output
cable connector in the LED MODULE #5 with the black return cable connector. Turn on main power to