MAG/MNL145685L(NC)
6
1.
DC Varistor Voltage Test
The DC Varistor voltage of the Protector Modules may be tested as follows:
a)
Disconnect power.
b)
Remove the relays and light bulbs on the phase to be tested.
c)
Use a suitable Surge Protector Test Set capable of measuring the 1 mA clamping
voltage of MOV-type components, such as
Joslyn
Model 4010, and connect test leads
between the phase A, B or C terminal and the neutral terminal. Take a second set of
measurements referenced to the ground 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.
The following DC Varistor voltage values are considered acceptable:
•
Factory specification for new Protector:
420 to 520 Vdc
•
Protector in Use
410 to 530 Vdc
2.
To replace a Protector Module, proceed as follows:
1.
Disconnect power.
2.
Disconnect monitoring lead of module to be removed from terminal block.
3.
Remove 10-32 Screw from protector module bracket and neutral or ground plate.
4.
Loosen 8-32 Nuts on top of protector module.
5.
Loosen 3/8 Bolt, if necessary, and remove module.
3.
To install a new Protector Module the steps above are reversed.
Replaceable Parts:
•
Protector Module (L-N & L-G):
Joslyn
P/N 72396
•
Protector Assembly (N-G)
Joslyn
P/N 72362-02
•
Light Bulb:
B2A (NE51H),
Joslyn
P/N 49504
•
Relay:
Omron MY2-AC240 V,
Joslyn
P/N 51516
Optional Equipment:
Joslyn
Model 4010 Surge Protector Test Set
