EKE-Electronics EKE-Trainnet MVB - Red LED on; Red LED Blinking

On-board troubleshooting
19
4.3.2 Red LED on
If the red LED remains constantly on (without blinking), there are two possible causes
for this situation:
 Continuous reset by some other module (Only the red SE LED on)
 Defective module (Red SE LED on and green ST LED blinking or both the red SE
LED and the green ST LED on)
The following sections provide you with tips and instructions for solving these error
situations.
Continuous reset by some other module
One reason for the red LED being on may be that some other module in the system
continuously resets itself. This can happen due to too low an operational voltage or
some other problem in that module. For instance, the EKE-Trainnet
®
PSV power
supply module does this automatically when the operational voltage is too low.
To find out whether this is the case, measure the operational voltage. Do the following:
1 Connect an extension board to the rack.
2 Turn on the rack power.
3 Check that the voltage between pins VCC (X7) and GND (X8) is between +4.75 and
+5.25V. For locating the pins, see the layout diagram in Appendix B.
4 If the operational voltage is too low, there is an error in the power supply module.
Troubleshoot the power supply module according to the manufacturer’s
instructions. If your system uses EKE-Trainnet
®
PSV Power Supply Module, see
the PSV manual.
If the operational voltage is correct, continue with the troubleshooting tips presented in
the following section.
Defective module
If the red SE LED is on and the green ST LED is blinking, the module cannot start the
application for some reason, or there may be trouble with the self tests, the Code Check
Sum test in particular. (See “Automatic self-tests” on page 23.). This means that the
module is more than likely defective, especially if it is the only module in the rack
suffering from this problem. The same applies to the situation where both the red SE
LED and the green ST LED are on. All EKE-Trainnet
®
modules have passed a
production test procedure and are thus guaranteed to function properly. However, a
module may be damaged during shipment or handling. Remove the defective module
from the rack and replace it with a spare one.
4.3.3 Red LED blinking
One possible symptom is that the red SE LED in the front panel of the rack is blinking.
In such a case, the MVB module remains in the RESET mode. This means that the
system cannot start, because the ACFAIL signal is either constantly on or alternating