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UltiMod Designer Manual
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Total is the total number of power supplies operated
simultaneously.
Failure is the number of failures.
t is the observation period.
MTBF may be established in two ways, by actual statistics on
the hours of operation of a large population of units, or by
calculation from a known standard such as Telecordia SR-332
and MIL-HDBK-217 and its revisions.
Determining MTBF by Calculation
MTBF, when calculated in accordance with Telecordia, MIL-
HDBK-217 and other reliability tables involves the summation of
the failure rates of each individual component at its operating
temperature. The failure rate of each component is determined
by multiplying a base failure rate for that component by its
operating stress level.
The result is FPMH, the failure rate per million operating
hours for that component.
Then FPMH for an assembly is simply the sum of the individual
component FPMH.
Total FPMH = FPMH1 + FPMH2 + ………….. +FPMHn
MTBF (hours) = 1,000,000
FPMH
In this manner, MTBF can be calculated at any temperature.
The UltiMod series has the following failure rates at 40°C and
full load, based on Telecordia SR-332 standard.
powerMod 0.958 failures per million hours
4slot powerPac 0.92 failures per million hours
6slot powerPac 0.946 failures per million hours
The figures for the powerPac excludes fans.
Example:
What is the MTBF of UX4DD00
UX4 FPMH = 0.92
XgD FPMH = 0.286
Total FPMH = 1.49
MTBF = 670,000 hours at 40°C
MTBF and Temperature
Reliability and MTBF are highly dependent on operating
temperature. The figures above are given at 40°C. For each
10°C decrease, the MTBF increases by a factor of
approximately 2. Conversely, however, for each 10°C increase,
the MTBF reduces by a similar factor. Therefore, when
comparing manufacturer's quoted MTBF figures, look at the
temperature information provided.
Section 4.14
Safety Approvals
Low Voltage Directive (LVD) 2006/95/EC
The LVD applies to equipment with an AC input voltage of between
50V and 1000V or a DC input voltage between 75V and 1500V. The
Ultimod series is CE marked to show compliance with the LVD.
The relevant European standards for the UtliMod are:
- EN60950 (Information technology). The 2nd Edition of
this standard in now published and all relevant Excelsys
power supplies are certified to the latest edition as well as
the 1st Edition.
- EN60601-1 (Medical Devices Directive). The 3rd Edition of
this standard is published and all Excelsys medically
approved power supplies are certified to this latest edition
as well as the 2nd Edition.
- With appropriate packaging, the UltiMod can also meet
the requirements of EN61010-1 for industrial
scientific measuring equipment and process control.
UX4 and UX6 models are certified to comply with the
requirements of IEC950, EN60950, UL60950 (1st and 2nd
Editions), and CSA 22.2 no. 234 and IEC1010, when correctly
installed in a imited access environment.
The UX4 and UX6 models are certified to comply with the
requirements of IEC601-1, EN60601-1, UL60601-1 (2nd and
3rd Editions) and CSA601-1, for non-patient connect
applications.
powerMods are capable of providing hazardous energy levels
(>240 VA). Equipment manufacturers must provide adequate
protection to service personnel.
Environmental Parameters
The UltiMod series is designed for the following parameters:
Material Group IIIb, Pollution Degree 2
Installation Category 2
Class I
Indoor use (installed, accessible to Service Engineers only).
Altitude: -155 metres to +2000 metres from sea level.
Humidity: 5 to 95% non-condensing.
Operating temperature -20°C to 70°C
Derate to 70°C. See powerPac Derating for details.
Approval Limitations
Use in North America
When this product is used on 180 to 253 Volts AC mains with no
neutral, connect the two live wires to L (live) and N (neutral)
terminals on the input connector.
UltiMod Creepage Distances
Primary mains circuits to earth: 4mm spacing
Primary mains circuits to secondary: 8mm spacing
UltiMod Dielectric strength
Primary mains circuits to chassis: 1500VAC
Primary mains circuits to secondary: 4000VAC
The primary to secondary test is not possible with modules fitted
to the unit, as damage to the EMI capacitors will occur.
Output Isolation
Outputs are each isolated 500V DC to each other and 500 V DC
to chassis.
Section 4.1
Electro Magnetic Characteristics
EMC Directive 89/336/EEC
Component Power Supplies such as the UltiMod series are not
covered by the EMC directive. It is not possible for any power
supply manufacturer to guarantee conformity of the final product
to the EMC directive, since performance is critically dependent
on the final system configuration. System compliance with the
EMC directive is facilitated by Ultimod compliance with several of
the requirements as outlined in the following paragraphs.