Code
Load
Fan
Hand-
held (or
PC)
Description
.
Off
Off
Emergency Stop.
0.
Off
Off
None
Load bank running. Switch (or remote modbus)
control or Hand-held (or PC) not plugged in.
1.
Off
Off
Ok
Ready to apply load from Hand-held (or PC).
2.
Off
On
None
Fan running - decade switch (or remote modbus)
control.
3.
Off
On
Ok
Fan running - Hand-held (or PC) control.
4.
On
Off
None
Fan starting - decade switch (or remote modbus)
control.
5.
On
Off
Ok
Fan starting - Hand-held (or PC) control.
6.
On
On
None
Load applied - decade switch (or remote modbus)
control.
7.
On
On
Ok
Load applied - Hand-held (or PC) control.
P.
Ok
‘Setup’ mode. Sigma load bank setup/diagnostic
program running.
n.
Load bank firmware upgrade in progress.
5 - 7
Sigma 2 Normal Operation
In normal operation a single character status code is displayed on the LED:
Warnings
If an event occurs that generates a warning the load bank Reset 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 ‘Reset’ 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.
Maintenance & Troubleshooting
