Lambda Sirius 250 Instruction Manual

Sirius 250 Handbook

Input Parameters

NOMINAL INPUT VOLTAGE RANGE 94.5 - 240VAC or 133-330VDC
MAX. INPUT VOLTAGE RANGE
INPUT FREQUENCY
MAXIMUM INPUT CURRENT
INRUSH CURRENT

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)
Top Fan with Molex End Fan with Molex End Fan with IEC
(TM) (EM) (EI & EIF)
245W 250W 250W
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
220W * 230W 175W
* 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.
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.
85-264VAC or 120-360VDC 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
47-63Hz
handbook/specifi cation and which will result in the highest
temperatures in the PSU. To determine the most adverse conditions consid-
5A AC or 3.4A DC
eration should be given to the maximum operating ambient, PSU loading and
<50 AMPS
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.
Circuit Ref
TX1
TX2
L1 & L6
L12
-
F1
C1 & C18
C5
-
-
See component layout drawing on page 4
Reverse Airfl ow

Output Ratings

(air into unit at output
end)
End Fan with IEC
(EIR & EIFR)
Output
Module
Range
210W
5/3 base 5.0 - 5.7V
2.7 - 3.5V
5/12 base 5.0 - 5.7V
11 - 16V
5 base 5 - 5.7V
24 base 23-28V
3 m/s
A 4.5 - 5.5V
200W B 11 - 15V
C 16 - 28V
D 4.5 - 5.5V
2.7 - 3.9V
E 4.5 - 5.5V
9 - 15V
F 4.5 - 5.5V
16 - 28V
G 9 - 15V
9 - 15V
H 9 - 15V
16 - 28V
J 16 - 28V
16 - 28V
L 1.8 - 3.9V
M 4.5 - 5.5V
4.5 - 5.5V
N 11 - 14.5V
*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.
Description Max Temp (
Power transformer primary, secondary and core
Drive transformer windings
Choke winding
Choke winding and core
All other choke windings
Input fuse end cap and clip
X capacitors
Reservoir electrolytic capacitor
Electrolytic capacitors < 10mm diaameter
Electrolytic capacitors >- 10mm diameter
Min setting for
Short Circuit
Current Hazardous Energy
Turns
Current (*3)
35A(*2) 1T 80A 3V
16A 1T 80A -
35A(*2) 1T 80A 3V
8A (12A peak) 4T 20A -
35A(*2) 1T 80A 3V
10A(*2) 4T 20A 12V
10A 2T 40A -
8A 4T 20A -
4A 8T 10A -
5A 2T 40A -
5A 2T 40A -
5A 2T 40A -
4A 4T 20A -
5A 2T 40A -
2A 7T 11.5A -
4.5A 4T 20A -
4.5A 4T 20A -
4A 4T 20A
2A 7T 11.5A -
2A 7T 11.5A -
2A 7T 11.5A -
10A 2T 40A -
5A 2T 40A -
5A 2T 40A -
8A 4T 20A -
Important safety instructions

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.

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
0 C)
considered hazardous, as a single fault in the secondary may make them exceed the SELV limits
130
between output and earth. If any output is non-SELV then all outputs become non SELV. Outputs
110
connected in series may produce non-SELV levels, and this must be taken into account in the
110 end-use application.
120

Approval Limitations: Use in North America (AC units only)

115
When this product is used on 180VAC-250VAC mains with no neutral, connect the two live wires
100
to L(live) and N (neutral) terminals on the input connector. In this instance double pole fusing is
100
required.
85
90

High Voltage Warning

95
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 Class of Protection

(*4)
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.

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.
Part Number 17132