Technical_reference.pdf - 第80页
Technical Service Manual 80 Revision Dat e: August 2004 A.C. & D.C . POW ER SUPPLIES CONTROL CIRCUIT TRANSFORMER The c ontrol circuit tr ansfor mer is a m ulti-tapped trans form er. Deter mine that the pr im ary cond…
Technical Service Manual 79 Revision Date: August 2004
Every Field Service Technician should be issued an antistatic kit consisting of a static dissipative portable work surface
and a combined wrist strap and grounding strap to connect to the work surface. The proper way to use the kit follows.
NOTE: Vitronics-Soltec strongly recommends the use of a similar antistatic kit for all customers who do
any self-
maintenance on an Oven involving PC assemblies or semiconductor components.
1. Unfold the antistatic work surface and place it near the section of the oven where work will take place. Set it down
with the pocket side up. In addition, the surface under the mat must be clean and dry.
2. Remove the wrist strap and grounding cord from one of the pockets in the mat. Snap the round black connector in
the middle of the cord to the snap connector that is at one corner of the mat.
3. You might want to rotate the mat at this time so that the cord connector is closest to the oven where it will be
grounded.
4. Slide the alligator clip onto the banana jack which is on one end of the cord. Use the alligator clip to connect the cord
to an appropriate ground on the oven. Usually a piece of frame that is not painted works well.
5. Connect the wrist strap to the snap connector on the other end of the cord. The strap should 'snap' onto the
connector for a positive connection.
6. Put the wrist strap onto your wrist, making sure that the strap is in contact with your skin all the way around your wrist.
Make sure that the strap is facing in the correct direction. The 'inside' of the strap will have metallic strands woven
into the material on the inside. You may not be able to see the strands but you will see the wrong color of these
strands, typically off-white or gray.
7. Make sure that the wrist strap is tight on your wrist. If it needs to be adjusted, then 'pop' open the small plastic clip
and pull the strap until it is tight around your wrist. When it is tight, hold the strap and close the clip so that it 'snaps'
in place. This clip can be re-opened and the strap resized at anytime.
You are now ready to work on the static sensitive portions of the oven.
Remember; always put the wrist strap on before working on PC boards or semiconductors and leave it on until finished
with the task. Always remain connected until all PC assemblies are re-installed on the oven or protected by antistatic
bags.
When working on any electronic component, ALWAYS observe proper ESD handling procedures.
TAKE THE WRIST STRAP OFF before working on AC power!
Technical Service Manual 80 Revision Date: August 2004
A.C. & D.C. POWER SUPPLIES
CONTROL CIRCUIT TRANSFORMER
The control circuit transformer is a multi-tapped transformer. Determine that the primary conductors to this transformer
are connected in agreement with the supply voltage at the Oven Installation site.
Refer to the table below for transformer tap settings.
SPLIT PRIMARY T1 CONNECTIONS
INPUT
VAC
CONNECT F50 TO
1L1 1L2
INSTALL
JUMPER
190V H1A & H1B H2A & H2B
200V H1A & H1B H3A & H3B
208V H1A & H1B H4A & H4B
220V H1A & H1B H5A & H5B
240V H1A & H1B H6A & H6B
380V H1A H2B H2A & H1B
400V H1A H3B H3A & H1B
415V H1A H4B H4A & H1B
440V H1A H5B H5A & H1B
480V H1A H6B H6A & H1B
Test procedure for control transformer voltage
Þ With main power to the oven off, close the circuit breaker on the line side of the transformer. Open the circuit breaker
on the secondary side of the transformer. Verify that the secondary side of the transformer's neutral leg is grounded.
Þ Re-apply oven power. Using a Voltmeter set the proper range, measure the output voltage of the single phase
control transformer.(X1 – X4)
The output voltage of the transformer should be within +/-10% of the nominal transformer voltage (i.e. 108 VAC to 132
VAC). If the output voltage of the transformer is outside these values, the primary taps of the transformer should be
adjusted accordingly.
120 VAC PERIPHERAL SUPPLY (Option)
Two double way AC convenience outlets are located on the oven.
The 120 volt convenience outlets have their hot terminals connected to wire #5, neutral to wire #2, ground to any ground
terminal on the main electrical back panel. These outlets are protected by circuit breaker F54, located on the main
electrical back panel.
Technical Service Manual 81 Revision Date: August 2004
Test procedure for AC Convenience Outlets
Þ Disconnect power to the system. Using an Ohmmeter on its lowest scale, measure the resistance between the
ground terminal on the socket and the ground block on the main electrical back panel. This value should typically be
less than 1 ohm.
Þ With power applied to the system, use a Voltmeter set on the proper scale, measure the voltage between the live and
neutral terminals on the socket, this value should be to either 120 VAC.
D.C. POWER SUPPLY
Two DC Power Supplies provide the controller and various transducers with the required DC voltage. These supplies
are configured for 120 VAC input.
For Power Supply Wiring Connections, refer to the Oven Schematics
Minimum load:
A minimum load is required by the +5 VDC output to maintain proper operation of the other outputs. A load pulling
0.6 Amp is required. If the load is insufficient, a 10 ohm (5 Watt) resistor should be connected between the +5 VDC
output (wire number 1001) and the DC ground output (wire number 1007).
Test procedure for D.C. power supply voltage:
Verify that all single pole circuit breakers on the secondary side of the transformer are off except F52 & F55. Apply
oven power. If 120 VAC is present, measure the output voltages of the DC power supply.
D.C. power supply voltage adjustment:
Adjustments should be made to correct the voltage at the power supply output terminals. Voltage drops occurring
over lengths of cable should have larger cables installed to reduce voltage losses.
Voltage Checks
When troubleshooting an electrical or electronic problem, always verify the basic AC and DC voltages
supplied for operation.