Sirius 250 Handbook Part Number 17132
Input Parameters
NOMINAL INPUT VOLTAGE RANGE
94.5 - 240VAC or 133-330VDC
MAX. INPUT VOLTAGE RANGE
85-264VAC or 120-360VDC
INPUT FREQUENCY
47-63Hz
MAXIMUM INPUT CURRENT
5A AC or 3.4A DC
INRUSH CURRENT
<50 AMPS
Output Parameters
Adjustment and Derating.
The Sirius 250 series is designed to provide a max output power of 250W at
nominal output voltages. The following procedure must be used to ensure the
PSU is operated within its ratings:
a
Calculate user power for each module (volts x amps).
b
Add all the individual module powers together. The total power must not
exceed the value given in the following tables.
c
Calculate secondary transformer turns x amps for each module. (See
outputs table for transformer secondary turns).
d
Add all the module turns x amps together and this must not exceed 75AT.
e
If necessary reduce the loading until the conditions are met, ie. power and
ampere-turns
maxima.
OUTPUTS
Cooling,Output Power and Output Current Limitations
i) Power limitation method.
Integral Fan Cooling (all orientations)
Normal Airfl ow
(air into unit at input end)
Reverse Airfl ow
(air into unit at output
end)
Top Fan with Molex
(TM)
End Fan with Molex
(EM)
End Fan with IEC
(EI & EIF)
End Fan with IEC
(EIR & EIFR)
245W
250W
250W
210W
To determine the component temperatures tests must be conducted in accord-
ance with the requirements of IEC/EN/UL/CSA60950-1, Clause 4.5. Considera-
tion should also be given to the requirements of other safety standards. Note:
Max. temperatures given are as required by EN60950-1 or to provide satisfac-
tory reliability, whichever is the lower.
Test requirements include: PSU to be fi tted in its end-use equipment and oper-
ated under the most adverse conditions permitted in the end-use equipment
handbook/specifi cation and which will result in the highest
temperatures in the PSU. To determine the most adverse conditions consid-
eration should be given to the maximum operating ambient, PSU loading and
input voltage, ventilation, equipment orientation, the position of doors & covers,
etc. Temperatures should be monitored using type K fi ne wire thermocouples
(secured with cyanoacrylate adhesive, or similar) placed on the hottest part of
the component and the equipment should be run until all temperatures have
stabilised.
Customers Airfl ow (all orientations) (NM)
Normal Airfl ow (air into unit at input end)
Reverse Airfl ow (air into unit at output end)
2.5 m/s
3 m/s
2.5 m/s
3 m/s
220W *
230W
175W
200W
Circuit Ref
Description
Max Temp (
0
C)
TX1
Power transformer primary, secondary and core
130
TX2
Drive transformer windings
110
L1 & L6
Choke winding
110
L12
Choke winding and core
120
-
All other choke windings
115
F1
Input fuse end cap and clip
100
C1 & C18
X capacitors
100
C5
Reservoir electrolytic capacitor
85
-
Electrolytic capacitors < 10mm diaameter
90
-
Electrolytic capacitors >- 10mm diameter
95
* Output 2, 3.3V, is derated to 15A from 16A.
ii) Temperature Measurement Method:
The following method must be used for determining the safe operation of PSU’s
with the LM option (open frame). It may be used as an alternate method to (i)
above, for determining the safe operation of NM option PSU’s.
For PSU’s cooled by customer supplied airfl ow the components listed in the
table below must not exceed the temperatures given (including when the end
use equipment is operated at its maximum permitted ambient), consequently
the maximum temperature rise permitted is given by the temperatue given in the
table minus the T mra (maximum ambient) of the end use environment (maxi-
mum permitted T
mra
is 50
0
C). All other ratings given in this handbook remain
unchanged except that the maximum output power is 250W.
Module
Output
Range
Current
Turns
Short Circuit
Current (*3)
Min setting for
Hazardous Energy
(*4)
5/3 base
5.0 - 5.7V
35A(*2)
1T
80A
3V
2.7 - 3.5V
16A
1T
80A
-
5/12 base 5.0 - 5.7V
35A(*2)
1T
80A
3V
11 - 16V
8A (12A peak)
4T
20A
-
5 base
5 - 5.7V
35A(*2)
1T
80A
3V
24 base
23-28V
10A(*2)
4T
20A
12V
A
4.5 - 5.5V
10A
2T
40A
-
B
11 - 15V
8A
4T
20A
-
C
16 - 28V
4A
8T
10A
-
D
4.5 - 5.5V
5A
2T
40A
-
2.7 - 3.9V
5A
2T
40A
-
E
4.5 - 5.5V
5A
2T
40A
-
9 - 15V
4A
4T
20A
-
F
4.5 - 5.5V
5A
2T
40A
-
16 - 28V
2A
7T
11.5A
-
G
9 - 15V
4.5A
4T
20A
-
9 - 15V
4.5A
4T
20A
-
H
9 - 15V
4A
4T
20A
16 - 28V
2A
7T
11.5A
-
J
16 - 28V
2A
7T
11.5A
-
16 - 28V
2A
7T
11.5A
-
L
1.8 - 3.9V
10A
2T
40A
-
M
4.5 - 5.5V
5A
2T
40A
-
4.5 - 5.5V
5A
2T
40A
-
N
11 - 14.5V
8A
4T
20A
-
*2 = A minimum load of 10% is required on these outputs.
*3 = Maximum current if output is short circuited, within 1 minute current limit changes to
‘hiccup’ mode to give a lower average current.
*4 = It may not be possible to set the output this low.
Output Ratings
See component layout drawing on page 4
Approval Limitations: Use in North America (AC units only)
When this product is used on 180VAC-250VAC mains with no neutral, connect the two live wires
to L(live) and N (neutral) terminals on the input connector. In this instance double pole fusing is
required.
High Voltage Warning
Dangerous voltages present within the power supply. Do not remove covers.
External Hot Surfaces
Section 6 of the Health and Safety at Work Act requires that manufacturers have an obligation to
protect service engineers as well as users. In order to comply with this, a label must be fi tted to
these products which is clearly visible to service personnel accessing the overall equipment, and
which legibly warns that surfaces of these products may be hot and must not be touched when the
products are in operation.
Safety Earthing Screw
On products with an enclosure, special safety earthing screws are used which connect the cover to
the chassis. They must not be removed.
Safety Class of Protection
These products are designed for the following parameters : Material Group IIIb, Pollution Degree 2,
Overvoltage Category II, Class 1 (earthed), Indoor use as part of an overall equipment such that
the product is accessible to service engineers only.
Energy and Voltage Hazards
Certain modules are capable of providing hazardous energy (240VA) according to output voltage
setting. Final equipment manufacturers must provide protection to service personnel against
inadvertent contact with these module output terminals. If set such that hazardous energy can
occur then the module terminals or connections must not be user accessible.Non-seriesed outputs
that are earthed in the end use equipment are SELV .If outputs are not earthed they must be
considered hazardous, as a single fault in the secondary may make them exceed the SELV limits
between output and earth. If any output is non-SELV then all outputs become non SELV. Outputs
connected in series may produce non-SELV levels, and this must be taken into account in the
end-use application.
Servicing
These products are not customer serviceable. Repairs may only be carried out by Lambda UK or
their authorised agents. These products are not authorised for use as critical components in nuclear
control systems, life support systems or equipment for use in hazardous environments without the
express written approval of the Managing Director of Coutant Lambda Ltd.
Important safety instructions
