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The cooling water provided must comply with chemical and
physical specifications as stated in the Resistance Welder
Manufacturers’ Association Bulletin 5–005.05:
•
Maximum temperature not to exceed 104
°
F. (40
°
C.), or fall
below the dew point of ambient air at about 70
°
F. (21
°
C.).
•
Maximum pressure not to exceed 90 PSIG
•
pH maintained between 7.0 and 8.0
•
Maximum chloride content 20 parts per million (PPM)
•
Maximum nitrate content 10 PPM
•
Maximum sulfate content 100 PPM
•
Maximum suspended solids content 100 PPM, non-abrasive
•
Maximum total (suspended and dissolved) solids content 250
PPM
•
Maximum calcium carbonate content 250 PPM
•
Resistivity less than 2,000 ohms/cm at 25° C. (500
µ
S)
•
The hose used must be NO LESS THAN 18 in. long across the
power voltages.
>?D5*
Water that is safe for drinking is generally sufficient for cooling water,
provided it is filtered to eliminate sand and rust particles. In addition,
temperature of the cooling water must NOT fall more than 2
°
C. below
the temperature of the surrounding air.
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In general, the SCRs require a MINIMUM flow rate of 0.5 gallon
(2 liters) per minute. The recommended maximum is 1.0 gal (4 l.)
per minute. Larger SCRs (2,100 A. or greater) may require a
higher flow rate. Consult WTC for more information.
WARNING!
This warning applies ONLY to SCRs having cooling-
water hosing connected either between tangs, or
between tang and ground:
REMOVE POWER from the SCR if the cooling water
is not flowing and the resistivity of the water is less
than 2,000 ohms/cm @ 25
°
C, or conductivity is
greater than 500
µ
S @ 25
°
C.
Содержание MedWeld 3005
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