Zippy M1S2-5500V4H - Manual (Page 11)

c) If two modules inserted, but only power on one power module. The detect
circuit will judge the other module is abnormal (no output) then send
alarming signals.
2) REDUNDENT-MODE
In this mode two modules have to inserted and power on. Any one module
failed the other module will continue working and detect circuit send out the
alarming signals. Alarming singles can be removed by replacing a new power
module or user can disable it.
1.11 TROUBLE SHOOTING
If you have followed these instructions correctly, it should function normally.
Some common symptoms are, the system doesn’t work, buzzer alarms, shutdown
after running a very short period,…etc. If so, please check the following steps to verify
and correct it.
1) Check all connection (if pinouts is correct, if any connection loosed, if the direction
is incorrect,…etc.).
2) Check if any short-circuit or defective peripherals by plugging out the power
connector from each peripheral, one at a time. Shall the system functions again,
you have solved the problem.
3) Once you hear the buzzer sound or see the warning LED in RED, please check,
a) If the loading is under the minimum or over the maximum load of each
channel.
b) If the power source is well connected and supplied.
Shall the above condition is happened, please disconnect the power source and
wait for 2-3 minutes to release the protection status; then test it again.
c) If buzzer keeps alarming or LED indicates the power module failure, please
locate which power module is defective. Perform hot-swap procedures (ref. to
Sec. 1.8 Hot-Swap Procedures). Return the defective power module back to
your vendor for RMA procedure.
d) If you can not fix the problem, please contact your vendor for supporting.