Stop, Start & Operating the External Service Bypass Panel
Single Utility | 2.5.3 Isolating one UPS for service/maintenance |
H003
Utility
Q003
Service bypass switch
H002b
H004
Q004
H002a
In a redundant system one UPS can be isolated for service/maintenance without
Load | affecting the other parallel UPS(s). |
| |
| 1. Check that the remaining UPS(s) will be able to carry the load when one UPS is |
| isolated. |
Q001a | Q001b | Q002b |
|
| DP300E |
Q002a
2.Switch off the system to be isolated for maintenance by pushing the red “OFF”
3.Disconnect output and utility by turning output switch (Q002) to position “0” and input switch (Q001) to position “0”, disconnect battery by opening battery MCCB.
DP300E
If dual utility is present, turn the bypass input switch (Q010) to position “0”.
Dual Utility
| H003 |
|
Utility 2 |
| Load |
| Q003 |
|
Service bypass switch | H004 | |
| Q004 |
|
H010a |
|
|
Q010a | H002a |
|
|
| |
Utility 1 | DP300E |
|
Q001a | Q002a |
|
H010b |
|
|
Q010b | H002b |
|
| DP300E |
|
Q001b | Q002b |
|
Switching back the UPS to normal parallel/redundant operation
1.Turn the input switch (Q001) and the output switch (Q002) to position “1”. If dual utility is present, turn the bypass input switch (Q010) to position “1”.
2.Charge capacitors, connect battery and start up the UPS as described in chapter 2.5.
The UPS will automatically switch to normal operation and start load sharing with the other parallelled UPS(s).
WARNING!
The system will discharge built- in capacitors. However, before working on the system check with a multimeter that there is no dangerous voltage on the terminals.
NOTE:
When Q002 is in position “0” the UPS can be operated and tested as a single system without affecting the other parallel UPS(s) if proper monitoring has been installed. Available on all APC bypass panels.
7OA0002 US rev. 04
14 | User Guide Silcon DP300E Series 480V |