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The following test will determine the condition of the protector modules:
It is desirable to test the protector with the power off. If this is not practical,
extreme caution must be observed when testing with power on and the fuses
removed. Hazardous voltages are present at the line terminals.
DC Varistor Voltage Test
The DC varistor voltage of the Protector Modules may be tested as follows:
a)
Disconnect power.
b)
Remove the fuse and light bulb on the phase to be tested.
c)
Use a suitable Surge Protector Test Set, such as Joslyn Model 4010, which will
measure varistor clamping voltage at 1mA, and connect test leads between the
9mm (3/8") terminal on the arrester side of the fuse and the neutral terminal.
Operate Test Set in accordance with instructions and read the displayed value. This
is the dc varistor voltage at 1 mA. Reverse leads and test again as above.
Tests of the neutral-ground module can be made directly across the module
terminals or at the main Neutral and Ground Terminals.
conductor must be disconnected for this test.
The following DC varistor voltage values are considered acceptable:
1.
Factory specification for new Protector
2.
Protector in Use
To replace a Protector Module, proceed as follows:
a)
Disconnect power.
b)
Remove fuses.
c)
Disconnect monitoring lead of module to be removed from terminal block.
d)
Remove 10-32 Screw from protector module ground bracket and chassis.
e)
Loosen 8-32 Nuts on top of protector module. Remove ground bracket.
f)
Slide protector toward relay bracket and remove.
To install a new Protector Module the steps above are reversed.
Replaceable Parts:
1.
Protector Module: L-N
2.
Protector Modules: L-G, N-G
3.
Fuse: Buss P/N FRN-R-60
4.
Light Bulb: B2A (NE51H)
Optional Equipment: Joslyn Model 4010-01 Surge Protector Test Set
MAG/MNL145740(A)
CAUTION
L-N
420 to 520 Vdc
400 to 540 Vdc
Joslyn P/N 72116
Joslyn P/N 72444
Joslyn P/N 63569
Joslyn P/N 49504
6
The service neutral
L-G, N-G
595 - 725 Vdc
565 - 745 Vdc
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