Technical_reference - 第120页
Technical Service Manual 120 Revision Dat e: August 2004 NOT E: This diagr am s hows the external plum bing c onnection c onfigur ed for an oven with two cooling cells. OPERATIO N: The Ex ternal Cooling Liquid Supply Opt…
Technical Service Manual 119 Revision Date: August 2004
EXTERNAL COOLING LIQUID SUPPLY OPTION
DESCRIPTION:
Heat in the cooling cells is absorbed by heat exchangers (two heat exchangers per top cooling cell) and conducted away
by the cooling fluid supplied by an external cooling system. The external cooling system should meet the following
specifications:
Supply Pressure: 20 to 40 psi [1.38 to 2.76 bar]
Flow Rate: 1 to 3 gpm [4.55 to 13.64 lpm]
Inlet Connection: 1/2" N.P.T
Outlet Connection: 1/2" N.P.T.
NOTE: Vitronics Soltec does not provide hose, clamps and hardware for connections between the reflow system and the
external cooling liquid supply (chiller, plant water, etc.).
Technical Service Manual 120 Revision Date: August 2004
NOTE: This diagram shows the external plumbing connection configured for an oven with two cooling cells.
OPERATION:
The External Cooling Liquid Supply Option is designed to be activated and operated with the reflow system at all times. It
requires a temperature-controlled flow of clean coolant at a constant pressure and flow to the heat exchanger(s). The
coolant temperature should remain above the local dew point when operating to avoid condensation inside the cooling
cells. The system can be drained by using the supplied hose and ball valve attached to the inlet plumbing leg.
SAFETY AND CONTROLS:
Inlet High Pressure Switch: Set to 50 psi, alarms when supply pressure is greater than 50 psi.
Inlet Shut Off Valve: Solenoid valve used to stop flow when machine is inactive
Inlet Pressure Gauge: Gauge used to monitor inlet pressure
Inlet Thermocouple (T/C 1): Monitors inlet cooling liquid temperature
Outlet Thermocouple (T/C 2): Monitors outlet cooling liquid temperature
Flow Switch: Set to 1gpm, alarms when flow falls below set point
Check Valve: Prevents outlet from back filling system
COOLANT SPECIFICATION:
Recommended:
Vitronics Super Cool Part No. 3313350
Distilled Water (recommend use of an additive to prevent algae growth)
Lab grade Propylene Glycol mixed with Distilled Water (20%-80% mixture)
NOTE: De-ionized water or other coolants that will react negatively with the materials used in the system must not to be
used. This will void the machine warranty.
Technical Service Manual 121 Revision Date: August 2004
RAIL ADJUST:
MANUAL RAIL ADJUST
Manual Rail Adjust is:
) Standard, (installed on all ovens with an edge rail conveyor) !An option, (NOT installed on all ovens)
DESCRIPTION
A PTC (Positive Temperature Coefficient Thermister) limits inrush current and a diode bridge rectifies the 120 VAC
control power for the Rail Adjust Drive Motor. The selector switch mounted at the end of the oven enable this DC voltage
to be applied to the Rail Adjust Drive Motor (providing that the controller has enabled the manual rail adjust function).
Depending upon the polarity of the signal applied to the motor, the motor operates in one direction or the other moving the
rails closer together or further apart. Two limit switches at one end of the oven open the circuit and stop the motor at the
end of travel in or out.
OPERATION
Run the “Manual rail adjust” within the Oven Control Program. NOTE: This operation may require a password.
This activates the rail enable output relay A1-K19. Nothing happens until the rail in/out button is turned. Turn the rail
in/out button in one direction. If the rail motor does not turn, turn the button in the other direction. If the motor still does
not turn, refer to the Oven Schematics and perform the following test procedure:
1 - Disable the manual rail adjust.
2 - Remove the bridge rectifier in the circuit (it should be connected to wires 307,2, 1024, and 1034 at the X10
terminals).
3 - Enable the manual rail adjust: A1-K19 should energize
4 - Select “Rail IN”: A1-K21 & A1-K9 should energize .
5 - Select “Rail OUT”: A1-K22 & A1-K9 & K8 should energize.
6 - If the rail in/out selections do not function, there MAY be a wiring error with the rail selector switch.
7 - After the rail selection logic has been corrected, check to see that the wiring to the motor is correct.
8 - Disable the manual rail adjust.
9 - Replace the bridge rectifier in the circuit connected to wires 307, 2, 1024, and 1034.
(Connect wire 1034 to the (+) terminal, wire 1024 to the (-) terminal, wire 307 to AC! And wire 2 to AC2 at the
X10 terminals).
10 - Using an Ohmmeter in the control enclosure, verify that there is continuity through each rail limit switch. (If
either the switch is wired incorrectly or the rail is pressed up against the limit ,there should not be continuity
through the switch.
11- Enable the manual rail adjust.
12- Check the operation of both the “in” and the “out” adjust switch positions.
13 - Disable the manual rail adjust.