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expense resulting from errors or omissions. In the interest of technical improvement, this specification may be altered without notice.
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PS-24-E
Issue: 5.5
Date Of Issue: 24/08/2010
© 2010 Sontay Limited. All rights reserved.
Technical Overview
The PS-24-24DC-E power supply is used to convert 24Vac to
a regulated 24Vdc output offering advanced protection, self-
diagnostics and self-test facilities. Featuring over-current
and over-voltage protection, LED indication of a wide range
of conditions, an optional alarm relay output for loss of input
and on-PCB reset button.
It is intended for applications requiring auxiliary power for
sensors or IO modules.
Installation
1. The PS-24-24DC-E should only be installed by a compe-
tent, suitably trained technician, experienced in installa-
tion with hazardous voltages. (>50Vac & <1000Vac or
>75Vdc & 1500Vdc)
2. Ensure that all power is disconnected before carrying out
any work on the PS-24-24DC-E .
3. Maximum cable is 2.5mm², care must be taken not to
over tighten terminals.
4. When mounting the PS-24-24DC-E care should be taken
not to stress the PCB when fitting to the DIN rail. If it is
necessary remove the module from the DIN rail, be sure
to use a flat bladed screwdriver to release the DIN clips.
LED Indication
Switch -On
When the PSU is powered up, the LED shows solid orange
for about 0.5 seconds. (If the reset button is pressed during
power up, it holds the unit at this step.) After about 0.5
seconds, the output is enabled and the alarm relay closes.
This state is held for up to 5 seconds, or until the output
voltage has achieved a minimum of 22.0Vdc.
While the output voltage is within bounds, the relay is held
closed, and the LED shows solid green. If the minimum
voltage is not achieved, the output is turned off, and the
relay opens. The LED flashes long-short in orange until the
reset button is pressed.
Reset Button
Whenever the reset button is pressed, the LED shows solid
orange, the output is turned off and the relay is opened.
LED Indication (continued)
Output Out of Limits
If the output voltage drops below 22.0Vdc, the LED flashes
short-short in orange. The relay stays closed for a maximum
of 4 seconds. If the output voltage is low enough for long
enough, the output voltage is turned off, the relay opens,
and the LED flashes long-short in orange until the reset
button is pressed. If the output voltage rises above 25.0Vdc,
the LED flashes short-short-short in red. The relay stays
closed for a maximum of 1 second. If the output voltage is
high enough for long enough, the output voltage is turned
off, the relay opens, and the LED flashes long-short-short in
red until the reset button is pressed.
Connections
NB The 0V terminal on the AC input connector is directly
connected to the 0v terminal on the DC output connector.
If the DC 0V terminal is connected to equipment which will
earth this connection the 0V of the AC input will be
earthed at the same time.
Care should be taken to ensure that earthing the AC supply
0V will not cause damage to any other equipment which
may be powered from it.
Neutral
Live
AC INPUT
DC OUTPUT
0V
0V
+24Vdc
+24Vdc
Fuse
Reset
button
Alarm
output
Status
LED
LED
1
N 24Vac L Reset Alarm
+24Vdc 0V
