D21m System

6.7

Power Supply and Miscellaneous

6.7.1

Primary Power SupplyA949.0404 (earlier version: A949.0403)

The D21m I/O frame may be equipped with either one or, for redundancy
purposes, with two primary power supply units.		 The module used is a primary switching AC/DC converter with an input
voltage range of 90-264 VAC/50-60 Hz, automatic power factor correction
and a standard IEC mains inlet. Output is 24 VDC/max. 8.5 A. It contains noadjustable elements; if the internal primary fuse should fail, the unit must be
returned to the factory for repair.		 The primary power supply unit(s) is/are plugged directly into the PSII PCB
A949.0402, where all required voltages for the frame are generated.

FAN/STATUS Connector		 This front-panel connector (15-pin D-type f for A949.0404; 9-pin D-type ffor A949.0403) is used to output an electrically isolated status signal when
the primary power supply (or one of them) should fail. The contacts of a relay
located on the LED/PSII PCB are available on this connector, as well as a+24 VDC supply and ground. The relay is energized as long as all supply
voltages are ok, pins 4 and 6 (or pins 1 and 2 on A949.0403) are connected
then. In case of failure of any of the frame’s supply voltages, pins 6 and 8 (orpins 2 and 3 on A949.0403) are connected. The connector in addition allows
supplying a fan unit (A949.0597); for the 15-pin connector on the current
version A949.0404 a 1:1 m/f cable (C089.201167)is used.		
Please note that only the connector of the right-hand primary PSU can beused for the status and supply signals, even if two primary power supply units
are installed in the D21m I/O frame.
Pin Assignment		
FAN/STATUS (15pin D-type, female, UNC 4-40 thread) on A949.0404:

1

9Solder/Crimp View
(or Socket View)

8

Document generated: 04.03.15

15Pin
1
2
3
4
5
6
7
8SignalPin Signal+24 VDC (fan supply, 650 mA max.)
9 GND
reserved - do not connect!
10 n.c.
GND
11 n.c.
* Relay NO (normally ope n)
12 reserved - do not connect!
** Fan supply OK (active low)
13 ** Fan in (active low)* Relay COMMON
14 reserved - do not connect!
GND
15 n.c.
Relay NC (normally closed)* Connected if everything is ok ** Status signals, foreseen for fan supervision
117

D21m System		
STATUS (9pin D-type, female, UNC 4-40 thread) on earlier version A949.0403:

Solder/Crimp View
(or Socket View)

6.7.2

165

9Pin
1
2
3
4
5
6
7
8
9Signal* Relay NO (‘normally open’)* Relay COMMON
Relay NC (‘normally closed’)
n.c.
n.c.
+24 VDC (650 mA max.)
n.c.
GND
GND
* Closed if everything is ok

LED/PSII PCB		

A949.0402
The primary power supply unit(s) as well as the frame’s backplane PCB are
directly plugged to the PSII PCB. It generates all the DC voltages required by
the frame from the 24 VDC delivered by the primary power supply unit(s),and it constantly monitors all supply voltages. As long as everything is ok,
a relay is energized. In case of failure of any one of the supply voltages, therelay releases. Both NO and NC relay contacts are available on the FAN/STATUS front panel connector of the right-hand primary PSU only.		
The PSII PCB contains no adjustable elements.		
The LED part of the PCB (not shown here) is located behind the frame’s front
panel and connected with a ribbon cable to P1 of the PSII PCB; it indicatesavailable/missing cards and supply voltages as well as the boot sequence anderrors while booting.

118

Document generated: 04.03.15