Getting Started
xv
Modified: 9/17/08
MedWeld 4000 Operator’s Guide
M-032116 Programs #T03300, #T02300 and #T02400
Cooling Water Requirements
Specifications on the
Web
The specifications for cooling water are subject to change. For the latest
specifications, go to the WTC Web site:
http://www.weldtechcorp.com/documentation/index.html
.
Cooling Water
Specifications
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.
NOTE:
Water that is safe for drinking is generally sufficient for cooling water,
provided it is filtered to eliminate sand and rust particles. In addition,
water temperature must
NOT
fall more than 2
°
C. below the temperature
of the surrounding air.
Water Flow Rate
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.