Filter
Top Products
T400 Ozone Analyzer Operator’s Manual Troubleshooting & Service
259
12.7. SUBSYSTEM CHECKOUT
12.7.1. AC MAIN POWER
WARNING – Electrical Shock Hazard
Should the AC power circuit breaker trip, investigate and correct the condition
causing this situation before turning the analyzer back on.
The T400 analyzer’s electronic systems will operate with any of the specified power
regimes. As long as system is connected to 100-120 VAC or 220-240 VAC at either 50
or 60 Hz it will turn on and after about 30 seconds show a front panel display.
Internally, the status LEDs located on the Relay PCA, Motherboard and CPU should
turn on as soon as the power is supplied.
If they do not, check the circuit breaker built into the ON/OFF switch on the
instruments front panel
The analyzer is correctly configured for the AC mains voltage in use if:
The Sample Pump is running.
If incorrect power is suspected, check that the correct voltage and frequency is present at
the line input on the rear panel.
Verify that the pump power configuration plug is properly wired (see Section
13.3.6.1)
If
the unit is set for 230 VAC and is plugged into 115 VAC or 100 VAC the sample
pump will not start.
If the unit is set for 115 or 100 VAC and is plugged into a 230 VAC circuit, the circuit
breaker built into the ON/OFF Switch on the front panel will trip to the OFF position
immediately after power is switched on.
12.7.2. DC POWER SUPPLY
If you have determined that the analyzer’s AC mains power is working, but the unit is
still not operating properly, there may be a problem with one of the instrument’s
switching power supplies. The supplies can have two faults, namely no DC output, and
noisy output.
To assist tracing DC Power Supply problems, the wiring used to connect the various
printed circuit assemblies and DC Powered components and the associated test points on
the relay PCA follow a standard color-coding scheme as defined in the following table.
Table 12-6: DC Power Test Point and Wiring Color Codes
NAME TEST POINT# COLOR DEFINITION
DGND
1
Black Digital ground
+5V
2
Red
AGND
3
Green Analog ground
+15V
4
Blue
-15V
5
Yellow
+12R
6
Purple 12 V return (ground) line
+12V
7
Orange
06870C DCN6332