cui.com

date 12/12/2014

page 6 of 7

CUI Inc

│ SERIES: PSF-155 │ DESCRIPTION: AC-DC POWER SUPPLY

PSF-155-B & PSF-155-D

Alarm Signal for AC OK and Battery Low

Internal Circuit of AC OK and Battery Low

Function

Description

Alarm Output

AC OK

The signal is low when the power

supply turns on

Low or short

The signal is high when the power

supply turns off

High/open

(external voltage < 30 V)

Battery

Low

The signal is low when the voltage of

the battery is below:

12 V (PSF-155-B), 22 V (PSF-155-D)

Low or short

The signal is high when the voltage of

the battery is above:

12 V (PSF-155-B), 22 V (PSF-155-D)

High/open

(external voltage < 30 V)

Notes:

1. Alarm signal is sent out through “AC OK” and “Battery Low” pins (relay contact type).

2. An external voltage source is required for this function. The maximum applied voltage is 30 V and the maximum sink current is 1 A.

Notes:

1. All specifications measured at 25°C, 230Vac input voltage, and rated power unless otherwise noted.

BATTERY CHARGING SPECIFICATIONS (CONTINUED)

For more information, please visit the product page.