socomec ATyS C20 Mode D'emploi page 55

5.3. Operation (cont.)
5.5.3. Test On load (accessible In AUT mode)
It is activated from:
• operation mode
• ATyS D20 interface
• programming input (TOL) if selected.
Description
This test simulates a loss of priority source situation. The sequence generates load transfer from priority source to emergency source
after backup source start up operation (in case of genset). The return sequence always keeps manual re transfer feature activated
(from priority source availability). All timers are counted down.
Keypad activation
After operation mode access, press mode push button to make test on load led blink and validate to start a cycle.
The test is only possible in automatic mode, the changeover switch in priority source position, priority source being available.
Remote activation via specific input
It is also possible to start a test on load remotely with the programming input TOL if selected. The cycle is started from contacts
closure. The re-transfer is initiated from contacts opening.
Automatic cycle keeps priority.
Manual retransfer to validate on keypad. In retransfer sequence from emergency source to priority source, the
1RT count down is set to 10 seconds (maximum), unless a lower value has been programmed.
The re-transfer from emergency source to priority source is blocked and only authorized after manuel retransfer
validation (keypad activation) or terminals opening.
Start gen relay is closed if source
1 2
2 has priority.
5. OPERATION
ATyS C20 / C30 - Ref. : 532 214 F 55