Stop/Start UPS and Operating the External Service Bypass
2.7Isolating one UPS in a Parallel Configuration for Service/Maintenance
2.7.1 Isolating one UPS in a Parallel/Redundant System
Single Utility
Utility
Dual Utility
H003
Load Utility 2 | Load |
Service bypass switch
APC Silcon
UPS
APC Silcon
UPS
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| Q003 | |
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| Service | |
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| bypass | |
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| switch | |
| H010a |
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Utility 1 | Q010a | APC Silcon | |
UPS | |||
| Q001a | ||
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| H010b |
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| Q010b | APC Silcon | |
| Q001b | UPS | |
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Q004
H002a
Q002a
H002b
Q002b
H004
In a redundant system one UPS may be isolated for service/maintenance without affecting other parallel UPS(S).
Action
1.Check that the remaining UPS(s) will be able to carry the load when one UPS is isolated.
2.Switch off the system to be isolated for maintenence by pushing the red OFF button.
3.Disconnect output and utility by setting output switches (Q002) to position 0 and input switch (Q001) to position 0. Disconnect battery by opening battery breaker.
4.If system has dual utility, set the bypass input switch (Q010) to position 0.
2.7.2Switching Back the UPS to Normal Parallel/Redundant Operation
Action
1.Set the input switch (Q001) and the output switch (Q002) to position 1.
2.If system has dual utility, set the bypass input switch (Q010) to position 1.
3.Charge capacitors, connect battery and start up the UPS as described in 2.4.1. Start UPS (from complete power down).
The UPS will automatically switch to normal operation and start
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16 | User Guide APC Silcon |
