Studer D21m Product Information

6.7.3 Air Defl ector/Filter Unit 1.949.599
If a D21m I/O frame has a power dissipation of less than 80 W, air defl ector/
fi lter units should be used on top of and below the frame. For frames dissipat-
ing more power, an air defl ector/fi lter unit should be used on top of the frame,
combined with a fan unit (see below) at its bottom. If space is available, a
second air defl ector/fi lter unit may be used below the fan unit, increasing the
air intake cross-section and thus improving the cooling effi ciency.
For more information on cooling and guidelines for power dissipation estima-
tion
refer to chapter 1.2.2, paragraph “thermal considerations”.
6.7.4 Fan Unit 1.949.597
In cases where the power dissipation of a D21m I/O frame exceeds 80 W,
active cooling is imperative. If no cooling system for the whole rack is used,
this 1U fan unit is required underneath the D21m frame. Seven fans draw air
in from the front (fi ltered) and from the bottom (unfi ltered) and blow it out
upward. The bottom is open and allows installing an additional air defl ector/
fi lter unit underneath the fan unit as described above, increasing the air intake
cross-section. In most cases, however, closing the fan unit’s bottom with a
piece of metal sheet is suffi cient.
For power supply to the fans and fan status monitoring, two connectors – one
at the front, the second at the rear of the unit – are provided. They are con-
nected in parallel, so either one can be used depending on the application. If
any of the fans should have a short or open circuit, the alarm signal is trig-
gered.
A 15-pin D-type cable (order no. 89.20.1167) for connection to the primary
PSU is required.
Please note that currently the fan monitoring is implemented for the use of
the fan unit within an SCore Live only.
For more information on cooling as well as guidelines for power dissipation
estimation
refer to chapter 1.2.2, paragraph “thermal considerations”.
Pin Assignment: FAN/STATUS (15-pin D-type, male):
Pin Signal Pin Signal
1+V
cc
(+15...24 V) 9 GND
2 n.c. 10 n.c.
3 GND 11 reserved (NTC)
4 n.c. 12 n.c.
5
Alarm relay + (open collector
pulling up to V
cc
if active)
13 GND
6 n.c. 14 n.c.
7 GND 15 reserved (Alarm LED+)
8 n.c.
18
915
Solder/Crimp View
(or Socket View)
D21m System
6-58 D21m Modules Date printed: 30.08.07

Studer D21m Specifications

General

Brand	Studer
Model	D21m
Category	Recording Equipment
Language	English