Troubleshooting; Power-On Initialization Failure (Unit Fault Condition) - Siemens SED2 VFD Operating Instructions Manual

Troubleshooting

WARNING:
Always disconnect all power sources before opening the SED2 Electronic
Bypass Option.
Power-on Initialization Failure
(Unit Fault Condition)
During power-on initialization, a unit fault condition occurs if the Electronic Bypass Option did not
pass the basic sanity test. Rather than flash normally, the basic sanity test indicator pauses,
flashes a fault code, and then repeats.
Table 7 shows the fault codes. For example, if the basic sanity test indicator flashes three times
rapidly, pauses, and then repeats, this means that there is a keypad failure.
Basic Sanity Test
Fault Code/Flashes
1
2
3
4
5
6
7
8
It may be possible to recover from the unit fault condition by simply attempting a power down/up
of the Electronic Bypass Option. If the unit fault condition still exists, replace the Controller board.
CAUTION:
When powering down/up the Electronic Bypass Option, power down the unit,
wait 5 minutes, and then power up the unit.
Siemens Building Technologies
Table 7. Basic Sanity Test Fault Codes.
Non-Volatile Memory Failure
Flash Memory Failure (CRC, cyclic redundancy check)
Keypad Failure
RAM Memory Failure (not used)
EEPROM Read error
EEPROM Write Failure
Runtime Flash Failure (CRC, cyclic redundancy check)
Main Program Failed (or hangs)
Description
Troubleshooting
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