Allen-Bradley SLC 500 Installation Instructions Manual page 14

14 Installation Instructions
Power Supply Undervoltage Operation
SLC 500 controllers continue to operate (hold-up) for a short period of time if the
input voltage to the power supply drops below the recommended operating
voltage range. The controller continues to scan the user program and control I/O
during this time. CPU hold-up for each power supply is shown on pages 14 and 16.
SLC 500 controllers turn OFF (stop scanning and disable outputs) if input voltage to
the power supply is removed or drops below the recommended operating range
for a period exceeding the CPU hold-up time. The controller resumes operation
automatically when the input voltage is restored to normal.
If the input voltage to the 1746-P7 power supply falls into a range of 4 to 9V for a
period exceeding the CPU hold-up time, the controller turns OFF and will not turn
back ON until input voltage is increased to 11V dc.
General Specifications (1746-P1, 1746-P2, 1746-P3, and 1746-P4)
Attribute
Line voltage
Typical line power
requirement
Inrush current, max
Internal current
capacity
(2)
Fuse protection
24V dc user-power
current capacity
24V dc user-power
voltage range
User-supplied
overcurrent
(7)
protection , max
Temperature,
ambient operating
(8)
Isolation
(9)
CPU hold-up time
Publication 1746-IN004B-EN-P - March 2008
Value
1746-P1 1746-P2
85...132/170...265V ac
47...63 Hz
135VA 180VA
20 A
2 A at 5V dc 5 A at 5V dc
0.46 A at 24V dc 0.96 A at 24V dc
1746-F1 or 1746-F2 or
(3) (4)
equivalent equivalent
200 mA
18...30V dc
15 A
0...60 °C (32...140 °F)
Current capacity is derated 5% above 55 °C (131 °F).
1800V ac RMS for 1 s
20 ms (full load) 3000 ms (no load)
1746-P3
19.2...28.8V dc
90VA
3.6 A at 5V dc
0.87 A at 24V dc
1746-F3 or
(3) (5) (3) (6)
equivalent
Not applicable
Not applicable
600V ac RMS for 1 s
(version B or later)
5 ms (full load)
1000 ms (no load)
1746-P4
85...132/
170...250V ac 47...63
Hz
150VA
45 A
10.0 A at 5V dc
(1)
2.88 A at 24V dc
Fuse is soldered in
place.
(1)
1 A
20.4...27.6V dc
15 A
0...60 °C
(32...140 °F)
no derating
2600V dc for 1 s
20 ms (full load)
3000 ms (no load)