Chapter 6 Maintenance 79
NetSure 801 CA7 Power Supply System (New Skelecton) User Manual
Fault description
1
．
Internal short-circuit of rectifier
The rectifier will automatically exit the system in case of internal short-circuit.
2
．
Damage to partial rectifier
In case of damage to partial rectifiers, if the remaining undamaged rectifiers are able to meet the power supply
requirements of loads, just turn off the AC input switches of the damaged rectifiers.
3
．
Rectifier output overvoltage
The overvoltage of a single rectifier will not cause the overvoltage protection of all rectifiers. However, if overvoltage
protection occurs to all rectifiers, the system cannot recover automatically.
Treatment: turn off the AC input switches of all rectifiers and remover the rectifier to disconnect it. At this time, the
system voltage should be below 56.4V. Then insert rectifier one by one and turn on the AC input switches to observe
the output current of it. When the AC input MCB of a certain rectifier is switched on, its output current is obviously
bigger than that of the others. When the system voltage is higher than 56.4V, the rectifier with bigger output must be
faulty Replace it. If all the rectifiers show the same symptom, you must turn off the monitoring and rectifiers and then
restart the rectifiers.
Note
During the treatment of rectifier fault, delete the address code of the closed rectifier in the rectifier parameters setting through the
controller. Refer to
M831D Controller User Manual
for deleting method.
6.5 Replacing Rectifier
Note
Rectifier surface temperature may be high, be careful when you pull out the rectifier.
When rectifier is faulty, see the following procedures to replace:
1. Check the new rectifier to see whether there is any damage.
2. Disconnect the AC input MCB of the rectifier and loosen the fixing screw on the panel of the rectifier. See Figure
Figure 6-2 Rectifier position slide switch
3
．
Grasp the handles, pull the module out of the cabinet slowly until it stops, and put the slide switch on
position.
Then pull out the rectifier completely. Observe whether there is a appropriate controller alarm.
4
．
Disconnect the rectifier switch, put the slide switch on
position, grasp the handles, and push the rectifier into
cabinet slowly, until it stops, as shown in Figure 6-3.
Figure 6-3 Replacing rectifier (1)