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PAC2000S12-B1 PSU
NO TE
1. 1+1 scenarios (input voltage of the active PSU: 220 V/50 Hz; input voltage of the standby PSU: 230 V/50 Hz):
When the total load of the system is less than or equal to 80% of the rated load of a single PSU, the standby
PSU does not connect to loads in the steady state. When the total load of the system ranges from 80% to
100%, the load ratio of the active and standby PSUs does not exceed 6:1 in the steady state. The total load
of the system ranges from 80% to 100%. If an active/standby switchover occurs, the PSU output voltage dip
can occur in microseconds (less than 11.4 V/100 μs and greater than 11 V). The upper limit of the PSU
output voltage cannot exceed 13.3 V.
2+2 scenarios (input voltage of the active PSU: 220 V/50 Hz; input voltage of the standby PSU: 230 V/50 Hz):
When the total load of the system is less than or equal to 160% of the rated load of a single PSU, the
standby PSU does not connect to loads in the steady state. When the total load of the system ranges from
160% to 200%, the load ratio of the active and standby PSUs does not exceed 6:1 in the steady state. The
total load of the system ranges from 180% to 200%. If an active/standby switchover occurs, the PSU output
voltage dip can occur in microseconds (less than 11.4 V/100 μs and greater than 11 V). The upper limit of
the PSU output voltage cannot exceed 13.3 V.
2. A software interface is provided for the system to query whether the PSU supports the N+R active/standby
feature.
●
When bit 14 of 0xCE is 1, N+R is supported.
●
When bit 14 of 0xCE is 0, N+R is not supported.
3. After a PSU enters the standby mode, it can exit the mode in any of the following cases:
1. The system clears bit 7 of PS_CONTROL (CEh) of the standby PSU.
2. The MCU of the standby PSU restarts.
3. The communication of the standby PSU is faulty.
4. The load of the standby PSU exceeds 50% of the rated load of a single PSU.
5. The load of the active PSU exceeds 100% of the rated load of a single PSU.
4. When the active PSU is faulty (except for PSU hot swap and output ORing-FET short circuit) or in 1+1 active/
standby scenarios with the total load greater than 100%, or in 2+2 active/standby scenarios with the total
load greater than 160%, the system needs to wake up the standby PSU in a timely manner (false wakeup is
allowed) to ensure that the 12 V bus voltage of the system is greater than or equal to 11.4 V (the 12 V bus
voltage of the system is greater than or equal to 11 V, and the time when the bus voltage is lower than 11.4
V is less than 100 µs).
5. The standby PSU experiences input current overshoot during active/standby switchover: When the total load
rate is greater than or equal to 90% of the load of a single PSU, the valid AC input current of the PSU is 20
ms@170% x I
or 100 ms@130% x I
max
input current of the PSU is 20 ms@150% x I
V AC/50 Hz; input voltage of the standby PSU: 230 V AC/50 Hz).
6. Standby PSU restart: The standby PSU is restarted after the input power is off. If the DSP is not powered off,
record the standby PSU status. After the standby PSU is restarted, it works with the voltage of the standby
PSU.
7. After the program is updated on the standby PSU, the standby PSU is removed, the power communication
fault is rectified, or the power module of the standby PSU is replaced, the active/standby information of the
standby PSU is initialized (the active PSU is restored by default), and the system resets the active/standby
information.
8. No single fault should cause the PSU to exceed the output overvoltage threshold (except for output
overvoltage).
9. Isolation function (except for short circuits): If output overvoltage, output overcurrent, or output short circuit
occurs, the faulty PSU can shut down the output. If a PSU fails, it must be isolated reliably. When a single
PSU fails, the system bus voltage must be greater than or equal to 11.4 V during voltage overshoot
(excluding internal short circuits and overvoltage) or dip. When the load is greater than 80%, the system bus
voltage is greater than or equal to 11 V and the time when the bus voltage is lower than 11.4 V is less than
100 µs.
Technical Manual
. When the total load rate is between 50% and 90%, the valid AC
max
or 100 ms@130% x I
max
5 Energy Saving Feature
(input voltage of the active PSU: 220
max
25
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