- Emerson Remote Terminal Unit Instruction Manual

CI-ControlWave Express Service / 3-3
Bulk supply voltages can be checked at TB1 using a voltmeter or multimeter. CPU/System
Controller Board Assemblies are factory configured for use with a nominal 6Vdc or 12Vdc
bulk power supply. The maximum and minimum input power switch-points can be tested
with the use of a Variable dc Power Supply connected between TB1-3 (+) and TB1-4 (-). By
increasing the input voltage (starting at less than +4.3Vdc, 9.5Vdc or 19.2Vdc) for +6V,
+12V or +24V units respectively, you can determine the point at which the unit will turn
on, i.e., the point at which the LCD Display comes ON (Vt+). By decreasing the input
voltage (starting at +8Vdc, +16Vdc or +28Vdc), you can determine the point at which the
unit turns off, i.e., the point at which the LCD Display goes OFF (Vt-). If the value of the
Primary Power System (battery) or bulk power supply’s +6Vdc, +12Vdc or +24Vdc output
approaches the value of Vt+ or Vt- it should be replaced by a battery/power supply with the
correct +6Vdc, +12Vdc or +24Vdc output.
3.3.2 LED and LCD Checks
CPU/System Controller Boards for the ControlWave GFC, GFC Plus, Express, Express
Plus, and Corrector are equipped with two red LEDs that provide the following status
conditions when lit: WD (CR1 - Right) – Indicates Watchdog condition has been detected &
IDLE (CR1 - Left) - Indicates the CPU has free time at the end of its execution cycle.
Normally, the Idle LED should be ON most of the time (unless disabled). When the Idle
LED is OFF, it indicates that the CPU has no free time, and may be overloaded.
CPU/System Controller Boards for the ControlWave Express ONLY are also equipped with
a piggyback mounted LED Board. These LEDs provide the following status conditions when
lit:
PG (Red) - ON = Power Good
WD (Red) - ON = Watchdog Condition - OFF = Normal Operation
IDLE (Red) - ON = CPU has free time at the end of its execution cycle
TX1, TX2, TX3 (Red) - ON = transmit activity on COM1, COM2 & COM3 (respectively)
RX1, RX2, RX3 (Red) - ON = receive activity on COM1, COM2 & COM3 (respectively)
Six Status LEDs (Red) - provide run time status codes (see Table 3-1 and Figure 3-1)
Normally, the Idle LED should be ON most of the time (unless disabled). When the Idle
LED is OFF, it indicates that the CPU has no free time, and may be overloaded.
Ethernet Port Connector J1 on the CPU/System Controller Board contains two LEDs that
indicate transmit (yellow) and receive (green) activity when lit.
An optional LCD Display provides system status codes that are useful in troubleshooting
the unit (see Table 3-1).
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