Transfer The Ups From Double Conversion Mode To Maintenance Bypass Mode; Figure 6-43: Double Conversion Mode; Figure 6-44: Maintenance Bypass Mode - Eaton 93PR Installation And Operation Manual

6.7. Transfer the UPS from Double Conversion Mode to Maintenance Bypass Mode

The operation of the internal MBS is allowed for a trained person only who is familiar with the UPS
behavior and functions. The full UPS wiring diagram with a MBS switch is presented in the installation
instructions.
The integral MBS and Static Bypass need to supplied by the same source.
Transfer the UPS to Maintenance Bypass Mode:
1. The normal start position should be following:
Maintenance
bypass input
Static
bypass input
Rectifier input
2. Perform transfer from double conversion mode to bypass mode as described in Section
from Double Conversion Mode to Bypass Mode . Remember to verify the transfer before proceeding to
the next step.
3. Turn the MBS from UPS position to Bypass position.
4. Perform the LOAD OFF procedure in Section
5. Turn OFF the rectifier switch to disconnect UPS rectifier input.
6. Turn OFF the output switch to disconnect UPS Inverter output.
7. Turn OFF the bypass switch to disconnect UPS bypass input.
UPS is now in the Maintenance Bypass Mode:
Maintenance
bypass input
Static
bypass input
Rectifier input
116
NOTE
Bypass switch
Input switch

Figure 6-43: Double Conversion Mode

Bypass switch
Input switch

Figure 6-44: Maintenance Bypass Mode

Maintenance bypass switch (MBS)
Output switch
6.3.7 UPS System and Critical Load Shutdown .
Maintenance bypass switch (MBS)
Output switch
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Output
6.3.3 Transfer
Output