Eaton 93PR Series, User And Installation Manual

Page: 81 / 98

25-75 kW
User's and Installation Guide 72
Transfer the UPS to Maintenance Bypass Mode:
1. The normal start position should be following:
Figure 6-9: The Normal Positions of the MBS Switches and Rectifier Disconnect Switch
(Must be Located in the Site Wiring)
2. Refer the chapter 6.4.3, and transfer Normal Mode to Bypass Mode.
3. Remove the protective cover plate in front of MBS, turn on the
MBS,
then turn off the output switch.
4. Refer the chapter 6.4.7 to shut down the USP system.
5. Turn off the rectifier switch to disconnect UPS rectifier input.
6. Turn off the static bypass switch to disconnect UPS bypass input.
7. Turn off the N line switch.
UPS is now in the Maintenance Bypass Mode:
Figure 6-10 Maintenance Bypass Mode
Maintenance
bypass input
Maintenance
bypass input
Static
bypass input
Static
bypass input
Rectifier input
Rectifier input
Bypass switch
Bypass switch
Input switch
Input switch
Output switch
Output switch
Maintenance bypass switch (MBS)
Maintenance bypass switch (MBS)