Sigma 2 Load Bank Status Display; Sigma 2 Normal Operation - Asco 8300 User Manual

Chapter Five

Sigma 2 Load Bank Status Display

The load bank status is displayed on the seven segment LED located on the Sigma 2 load
bank module.
Figure 5-1 The Sigma 2 control unit showing LED display
During operation the LED decimal point flashes every second.
If the decimal point is not flashing then a software problem is likely. Cycle the fans and
controls power supply off and on to restart the Sigma 2 controller and clear the fault.

Sigma 2 Normal Operation

In normal operation a single character status code is displayed on the LED:
Code Load Fan
. Off Off
0. Off Off
1. Off Off
2. Off On
3. Off On
4. On Off
5. On Off
6. On On
7. On On
P.
n.
Hand-
held (or Description
PC)
Emergency Stop.
Load bank running. Switch (or remote modbus)
None
control or Hand-held (or PC) not plugged in.
Ok Ready to apply load from Hand-held (or PC).
Fan running - decade switch (or remote modbus)
None
control.
Ok Fan running - Hand-held (or PC) control.
Fan starting - decade switch (or remote modbus)
None
control.
Ok Fan starting - Hand-held (or PC) control.
Load applied - decade switch (or remote modbus)
None
control.
Ok Load applied - Hand-held (or PC) control.
'Setup' mode. Sigma load bank setup/diagnostic
Ok
program running.
Load bank firmware upgrade in progress.
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Maintenance & Troubleshooting
Warnings
If an event occurs that generates a warning the load bank Stop button lamp will begin to
blink and a warning code sequence will be displayed on the Sigma 2 control unit LED. Each
character in the four step sequence is displayed for 500ms with the code repeating every
2s. The end of the sequence is indicated with the decimal point only.
Three digit warning codes start with H as the first digit. The second digit indicates the
operational status as follows:
Code Description
H0- High temperature warning.
H1- Load step error - faulty step disabled. Press and hold the load bank 'Stop' button for 6
seconds to re-enable the load steps.
H2- Communications to Hand-held (or PC) intermittent.
H3- Supply-on-test wiring incorrect.
H4- Supply-on-test phase rotation error.
H9- Load bank setup corrupt – using backup data.
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