There are several types of PowerSwitch bypasses available from Advance
Manual |
simple maintenance switch |
Automatic |
reverts to mains if UPS fails |
Dual redundant |
for selecting between two in-phase supplies |
Dual redundant used in `one fault tolerant' mode |
for mission crucial applications |
HotSwitch |
for selecting between two out-of-phase supplies |
Each logical schematic is shown in the `normal' mode
manual |
automatic |
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| s1a and s1b are ganged wipers on a manual switch the switch is MBB (make before break) in bypass mode the UPS may be safely removed from the circuit |
s1 is the same as the manual version the relay control detects the output voltage from the UPS. If the UPS output fails the Relay Control operates the two switches which connect the critical load to the mains and the neon lights |
dual redundant (DRS) |
hot switch |
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the schematic is per DRS but one supply has some added power conditioning the HotSwitch permits the use of supplies which are NOT snychronised |
| power is supplied from two independant sources which MUST be in-phase if supply `b' fails the control changes the critical load to supply `a' the keyswitch provides manual changeover |
both variations exhibit a small changeover break which will not affect ICT systems |
For more details see FBS series and special needs version or bypass considerations
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