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Model 200EU-NOy Option Manual Addendum
6.1.3 Bypass Pump Diagnostic Procedures
The bypass pump is capable of maintaining a total bypass flowrate of 4 lpm. If flow checks
indicate a fall off in bypass flow, the pump may need servicing. Check the pump, inlet fittings,
and analyzer for leaks first. If other causes have been eliminated, rebuild the pump.
6.1.4 Electrical Fault Isolation
115 VAC is supplied to:
1. The bypass pump.
2. The +5 volt switcher supply.
3. The input power to the converter temperature controller.
Use Figure 6.1 to check the 115 VAC supply voltage to each of these components.
The switcher supply produces 5 VDC to power the front panel display. Use Figure 6.1 to check
the 5 VDC supply voltage to the display.
The converter temperature is controlled by the 002560100 assembly in the NEMA chassis. The
00257 schematic is located at the back of this manual.
The converter temperature controller produces ±15 VDC to power the controller logic. The
OPTO ISOLATOR component switches the 115VAC to the heater. Check the heater element
for continuity. The DS1 LED is on when power is applied to the heater. Check for appropriate
voltages. The temperature is sensed by a thermocouple attached to TB1. Typical thermocouple
voltage at the 315
o
C setpoint is about 16 mV. U1 provides cold junction compensation and
linearizes the output of the thermocouple. The output of pin 8 on U1 is 1/100 of the temperature.
In other words 3.15 VDC represents 315
o
C.
6.2 Setting the Converter Temperature
A front panel-mounted programmable controller maintains the temperature of the remote
molybdenum converter. By pressing the PV/SV button in the lower left corner of the controller,
you can see the Present Value (actual temperature) or the Set Value (temperature set point). The
temperature and PID control parameters have been set at the factory and no further adjustment
should be necessary. Should you need to adjust the temperature, follow these steps:
1. Select SV with the PV/SV button,
2. Press the "up-arrow" under the digit you want to change,
3. (the digit will flash),
4. Press the "up-arrow" under the digit or the "down-arrow" at the left to scroll
the digit to the desired value,
5. Repeat for the other two digits,
6. Press the ENTER button.
Select
PV with the PV/SV button to observe the actual temperature.
05386 Rev. A 29