Red Lion GEMINI 52 - Manual (Page 4)

4
This application involves the monitoring and control of a glue allocation
process on a continuous web of industrial grade paper. In this case, the desired
results are to maintain a flow of glue between 2.00 and 2.50 gallons per 100
feet of web. To accomplish this, a Gemini 5200 is used in the A/B ratio
indicator mode, which will yield a direct readout in gallons per 100 feet to the
nearest hundredth gallon.
Channel A is connected to a 100 PPR RPGC pulse generator which is
mounted to the shaft of the glue pump. The pump delivers 0.38 gallons per
shaft revolution. Therefore, a scale factor of 0.3800 is programmed into
Channel A of the Gemini 5200 to yield 38 pulses per revolution. This
effectively multiplies the glue flow rate by 100 which allows a decimal point
to be programmed to the left of digit 2, producing a display of gallons per
second to the nearest hundredth gallon on Channel A.
A length sensor providing one pulse per foot of web material is fed into
Channel B of the Gemini. The Channel B scale multiplier is programmed for
x100 to produce a display reading of feet per second to the nearest hundredth
on Channel B.
The Gemini 5200 performs the A/B calculation and displays the ratio in
gallons per feet on Channel C. Since the application requires resolution in
hundredths of gallons, the Channel C display must be multiplied by 100 to
provide such resolution. However, the desired readout is not in terms of gallons
per foot, but rather gallons per 100 feet which requires the display to be
multiplied by another factor of 100. Therefore, the Channel C scale multiplier
is programmed for x10,000 (i.e. 100 x 100) which provides the desired
Channel C reading of gallons per 100 feet to the nearest hundredth gallon.
The relay outputs of the Gemini 5200 are connected to a speed control
mechanism on the glue pump which increases or decreases the glue flow rate
while the appropriate relay contacts are closed. Both preset outputs are assigned
to Channel C in the boundary mode of operation and are programmed for the
upper and lower acceptable limits of the glue flow rate. In this case, the pump
initially increases the output flow until a rate of 2.00 gallons per 100 feet is
reached, at which time Output 1 toggles to prevent further increase in speed.
If the flow rate reaches or exceeds 2.50 gallons per 100 feet, Output 2 will
toggle and send a correction signal to the pump until the speed slows to
acceptable limits. If the rate falls back below the lower limit, Output 1 again
toggles to speed-up the glue pump.
The Gemini 5200 can be used in this type of application to indicate and
control virtually any process that requires the distribution of a specified
amount of material in relation to another specified amount of material.
ORDERING INFORMATION
GEMINI 5200 APPLICATIONS (Cont’d)
CONTROLLING THE RELATIONSHIP BETWEEN SPECIFIED AMOUNTS OF MATERIAL
For more information on Pricing, Enclosures & Panel Mount Kits refer to the RLC Catalog or contact
your local RLC distributor.
GEM52 Gemini 5200
No GEM52060
Yes GEM52160
_ Gemini 5200 Relay Board RLYBD002
W/20 mA CURRENT LOOP
115/230 VAC
MODEL NO. DESCRIPTION
PART NUMBERS