JUMO 705001 mTRON T - Central Processing Unit Operating Manual - Manual (Page 30)

4 Electrical connection
30
4.4 Functional check
Once the electrical connection is complete, the following points must be checked:
1) Voltage supply
2) LED function
3) Errors during initialization
Voltage supply
LED function
When the voltage supply is connected, the LEDs on the central processing unit are tested au-
tomatically.
(If a voltage supply is present, the "Power" LED is permanently lit in green.)
If Then
"Power" LED (green) is lit The central processing unit is supplied with volt-
age.
"Power" LED is not lit The central processing unit is not supplied with
voltage, or the electrical function of the LED is
faulty.
Remedy:
• Check voltage supply to "+24 V" and "GND"
terminals of the central processing unit.
• Check power supply unit and connection be-
tween power supply unit and central process-
ing unit.
If the "Power" LED does not light up, despite a
voltage supply being present, the central process-
ing unit must be replaced.
If Then
The following LEDs light up in red simultane-
ously for approx. two seconds:
Status
BusError
Com1
Com2
The electrical function of the LEDs is in order.
One of the listed LEDs does not light up The central processing unit must be replaced.
After the test of the red LEDs, the following LEDs
light up in green simultaneously for approx. two
seconds:
Status
Com1
Com2
The electrical function of the LEDs is in order.
One of the listed LEDs does not light up The central processing unit must be replaced.