Chapter 7 Alarm Handling 107
Symptom
Monitoring module
alarms
Causes
Handling method
Rect Failure
Two or more recitifiers have the same ID
number
Contact Emerson for maintenance
Rect Failure
Serious current sharing imbalance (R48-
1800: load current imbalance > ± 3%; R48-
3200/ R48-2900U: load current imbalance >
± 5%)
Check whether the rectifier communication is
normal. If not, check whether the
communication cable is in normal connection.
If the communication is normal while the
protection indicator is on, replace the rectifier
Fault indicator
blinks
Rect Fan Fails
Fan fault
Replace the fan
Replacing rectifier fan
If the rectifier fan is faulty and does not work, it should be replaced. Take the R48-1800 rectifiers as an example, the
replacement procedures are as follows:
1. Use a cross screwdriver to remove the 3 screws from the fixing holes and pull out the front panel, as shown in
Figure 6-2.
2. Unplug the power cable of the fan and remove the fan.
3. Install a new fan.
4. Plug the fan power cable.
5. Put the front panel back and fasten it with the 3 screws.
Fan
Front panel
Fixing screw
of the panel
Fixing screw of the fan
Figure 2.1 Disassembling the front panel
Replacing rectifier
Except replacing the fan, it is recommended not to repair any other part of the module. When faulty, the module
should be replaced, not repaired. See the following procedures to replace the rectifier.
1. Take a new rectifier and check it for any damage from transport.
2. Loosen the fixing screw of the handle of the R48-1800 rectifier with a Phillips screwdriver. Pull out the faulty
rectifier from the rack by grabbing its handle.
Be careful with the rectifier just pulled out from the system, as it could be very hot due to long-term operation. Do not
let it slip away and get damaged.
3. By holding the rectifier handle, push the new rectifier into the slot just vacated and make sure the connection is
good. After a brief delay, the rectifier run indicator will turn on and the fan will start running.
4. Check whether the new rectifier works normally. You should make sure that:
1) The monitoring module recognizes the new rectifier.
2) The new rectifier shares current with other rectifiers.
3) When this new rectifier is pulled out, there is a corresponding alarm and the monitoring module displays the alarm.
If the new rectifier passes all the above tests, the replacement is a success.
5. Push the handle back into the front panel to fix the rectifier with the positioning pin. Fix the fixing screw of the
handle of the R48-1800 rectifier with a Phillips screwdriver.
NetSure 501 A50, NetSure 501 AA0, NetSure 701 A51 19-Inch Subrack Power Supply System User Manual
