Tiffin Motorhomes, Inc.
105 2"" Street NW
Red Bay, AL 35582

256-356-8661

SB-51
Magnum Inverters on 2016 Allegro Buses

January 20, 2016
Dear Tiffin Customer,

It has come to our attention that some 2016 Allegro Bus Motorhomes could possibly have an inverter
installed that was manufactured incorrectly. The manufacturer of the Magnum MS2812 inverter
informed Tiffin Motorhomes there is a possibility that the suspect inverters received an internal
component that was meant for another model inverter. Use of this component in the inverter will lead
to premature failure of the inverter. The suspect inverters fall in a serial number range starting with H1-
34600 and ending with H1-34830. Tiffin Motorhomes has determined that your motorhome identified
by the VIN listed above has an inverter that falls within range of these serial numbers.

We have included instructions on inspecting the inverter installed on your motorhome and what to do if
the inverter has an incorrect FET printed circuit board. Sensata Technologies, the manufacturer of
Magnum products, will be coordinating the inspections and repairs if needed. Their phone number is
425-353-8833.

If you have any questions about this notice, please contact the Tiffin warranty department at 256-356-

8661 extension 2176 or email [email protected]

We regret any inconvenience this action may cause, but feel certain you understand our interest in the
continued use and enjoyment of your motorhome,

Thank you,

Tiffin Motorhomes, Inc.
Sensata Technologies
2211 West Casino Road
Everett, WA USA 98204

Magnum-Dimensions.com

mAGNUM/DIMENSIONS

SERVICE BULLETIN
Number: 151216

The purpose of this bulletin is to inform RV OEMs/Dealers about the need to inspect, and if necessary,
repair or replace the Magnum inverter.

Date Released: December 16, 2015

Reference: Magnum inverter/charger model MS2812 within a serial number range starting with H1-
34600 and ending with H1-34830 may be impacted.

Condition: Circuitry inside certain Magnum inverter/chargers may fail due to an incorrect FET Printed
Circuit Board (i.e., FET Board) that may have been installed.

Inspection: Follow the steps below to inspect the Magnum inverter. If the inspection procedures
determine an incorrectly installed FET board, the inverter must be removed and repaired, or replaced.

1, Open the motor home’s electrical compartment containing the Magnum inverter.
2, View the model and serial number label on the side of the inverter (see Figure 1).

Verify model, must be MS2812

Model: (MS2812 Inverter/Charger

Inverter Operation Charger Operation

« Continuous Output Power (25°C); 2800 VA + Continuous Charger Currant (25°C):

DG Input Range: 9.0% (62VD6(126V nom) | 125 ADC-@ 14.0 VDC nominal

+ Maximum Continuous Input Current: 373 ADC | with 120-VAC/60 Hz (18 AAC) input

- Nominal AC Output Voltage / Frequency: - Input Voltage Range: 60 to 140 VAG

120 VAG (45%) 60 Hz( 0.1 Hz) + Inpul Frequency Range: 50 to 70 Hz

+ Maximum Continuous Ouiput Current 23.3 AAC. | Maximum AC Input Curent

+ Surge Amps {overcurrent /feult Emit}: 30 AAC each Input (60. AAC total)

TO AAC (1 mSec}, 40 AAG (100 mSec) ~ DC Output Ranger: 8.510 16.5 VDC

~ Surge Power, 2900 Raad Watts (5 esconds) - Pawar Factor: 2.35

- AG Wolage Distortion at Rated Power; < 5% THD

Engineered and ManiJactured by: a
MAGN i
—EN € # G& FY
Conforms to ANSI/ UL STD 458 end LIL STD 1741, 2nd Edition .
3041033 Certified to CANICSA STD C222 No. 107.1-01 é Verify serial number,
seRIALNUMBER: |H1-1750Q\ H1-34600 to H1-34830
——————————— A
we. quarter EBIEMIENED ven FEUER impacted.
CBI

F INPUT 30A

Figure 1, MS2812 Model/Serial Number label

3. If the serial number is not within the serial number range, the internal FET board is correct and
no further inspection is required.

4. If the serial number is within the serial number range, the part number on the FET board inside
the inverter will need to be viewed to verify if it is the correct part.

Service Bulletin 151216 December 16, 2015 Page 1 of 3
Sensata Technologies
2211 West Casino Road
Everett, WA USA 98204

Magnum-Dimensions.com

NUM/DIMENSIONS

5. Attempt to verify whether the FET board is part 30-0041A (correct) or 30-0042 (remove).
e This can be done with the top cover on (as shown in Figure 2). Simply look through the
front right air intake grill (opposite side of serial number label side), and using a flashlight
confirm the PCB revision.

Figure 2, Looking at FET Board thru grifl

e If this is not possible-as the number cannot be observed or is covered-it will be necessary
to remove the inverter's top cover (see Figure 3).

= om A
Pe Pas ake rs
5 1 fara cl z Mt

Figure 3, Looking at FET Board with top cover removed

6. After determining the part number of the FET board, document this information and provide it to
Sensata’s Technical Support team for Magnum products at 1-425-353-8833 (8AM to SPM PST
Monday — Friday). If you have an inverter with a FET board that needs to be replaced, they will
assist you in locating an Authorized Service Center (ASC) in your area, or will exchange the
inverter.

Service Bulletin 151216 December 16, 2015 Page 2 of 3
Sensata Technologies
2211 West Casino Road
Everett, WA USA 98204

Magnum-Dimensions.com

Understand there are two different board-stenciled part numbers:
e 30-0041A board is for 12-volt inverters - correct and does not need to be replaced.
e 30-0042 board is only for 48-volt inverters - incorrect and NEEDS REPLACEMENT.

Incorrect 48V board
{PN: 30-0042)
NEEDS
REPLACEMENT

Correct 12V board
(PN: 30-0041A)
DO NOT REPLACE

Documentation:

MS2812 Serial Number:

Confirmed FET Board Part Number:

Motor Home VIN:

RMA (if inverter replacement required):

Warranty Labor Allowance: If replacement of the MS2672 inverter/charger is required, Sensata allows
30 minutes for product inspection, and one hour of labor for product removal / re-installation.

Inverter inspection:
Removal/Reinstall inverter:

0.5 hrs.
1.0 hrs.

if you have any questions conceming this bulletin, contact Magnum Technical Support at:

Service Bulletin 151216

1-425-353-8833

December 16, 2015

Page 3 of 3
Summary of UL Testing and Compliance related to safety & Thermal performance

Inverters for mobile applications are tested to UL458, the standard for mobile power
converters and inverters. This standard covers the design, construction and performance
verification of mobile power inverters. The purpose of this standard is to ensure end
products are safe and reliable through compliance with the standard as demonstrated by
testing and follow-up audits conducted by ETL.

The report contains construction information, critical components and performance test
compliance.

Electrical Safety

a. Section 28 Spacings specifies minimum distances as required to maintain dielectric
separation between live circuits. For 120 V circuits, 1/8” through air and 4%” over
surfaces. PWBs may have reduced spacings per UL840.

b. Section 3.1 Components — components used in this product shall comply with the
requirements for said component. Line connected components and any component
providing dielectric separation are UL Recognized for their application. Recognition
marks are plainly visible on those components.

Flammability

a. Section 6.4 (Construction) A polymeric part of an enclosure shall comply with the
requirements of the Standard for Polymeric Materials — Use in Electrical Equipment
Evaluations, UL746C. UL746, section 4, table 1 states minimum material requirements
for enclosure elements.

b. Section 27 Printed Wiring: A printed wiring board shall comply with the standard for
Printed Wiring Boards, UL796. UL796 Section 21 refers to Flammability testing and the
requirement of flammability classification. Boards used by Sensata/Magnum-
Dimensions are fabricated by Parason Industries (Yan Tat Technology Co), UL file
#E152990, types Y-16 and Y-01; type Y-01 meets UL796 DSR for line voltage application.
Both types comply with UL94 VO flammability test. Board type & UL compliance is
marked directly on every board by the fabricator.

Electrical Tests — carried out on a sample of the inverter and passed as requirement to

approval under the Standard:

a. Section 36, maximum current: to verify the maximum input current under continuous
conditions, as specified on the nameplate.

b, Section 37.1 Normal Temperature Test: verify internal components do not exceed their
rated temperature (as specified in the Standard) while under rated load. Of significance
are the transformer (200 C rated insulation system; maximum internal temperature of
165 C as measured by thermocouple) and semiconductors (100 C). The unit is tested in
various mounting positions to verify continuous operation

c. Section 37.2 Maximum Output without Fan: carried out as with 37.1, but with a reduced
load so as the fan is not operated.

d. Section 37.4 Maximum Overload without Trip: the unit is operated at a load below the
level which any Internal protective device (other than a branch-rated breaker} operates.
Required branch-rated breakers are to be bypassed during this test. No internal
component may exceed 20 C above temperatures permitted in 37.1
I.

Section 38 External Surface Temperature Limits: Metallic surfaces subject to casual
contact may not exceed 70 C during normal operation.
Section 39 Dielectric Withstand: withstand for 1 minute 1000V + 2x rated voltage as a 60
Hz rms potential applied between the primary (AC) circuit and any dead metal (chassis)
or secondary.
Section 46 Battery Charger Overcharge: Verify unit is able to withstand 106% of rated
input voltage during charging, adjusted to supply the most possible charge current.
Section 47 Abnormal Tests: For any of the following tests, the unit must not emit flame
or molten metal or become a risk of fire, electric shock or injury to persons. This
includes insulation breakdown and live parts becoming accessible. Tests are to be
repeated until a final condition is met, such as shorting or opening internal components,
operation of a branch circuit breaker, or opening of an internal fuse. Manual or
Automatic protectors must actuate within 2 minutes of test initiation and within 30
seconds of subsequent tests,

i. 47,2 Output Short Circuit — The output of the unit is to be short circuited.

ii. 47.4 Component Malfunction — Individual components within the unit are to be

opened or short-circuited. Switching Is to occur during normal operation.

iii. 47.6 Vibration Test - the unit shall be operable and with no loosening of parts
after 1 hour of 12.5 Hz 4” peak-to-peak displacement in the vertical plane.

iv. 47.8 Specific Value Overload — The unit is to be operated at 200% rated load
connected to the output. A manual reset protector is to be operated for 50
cycles.

¥. 47.11 Blocked Fan Test — A unit shall be operated for 7 hours with the rotor of
the fan motor prevented from rotating
Section 49.3 Transformer Burnout: The internal transformer shall be operated with a
load set to draw 3x the rated current (bypassing protective devices). The unit is to be
operated until ultimate conditions occur or cycled 50 times if a manual reset protector
operates.

V. Production Tests:

Section $3 Dielectric Withstand: A test potential of 1200 VAC (or 1700 VDC) is applied
for 1 second between primary terminals and both dead metal parts and secondary
wiring.

Section 54 Grounding Continuity Test: A continuity test is to be performed between the
dead metal of the chassis and any external grounding means.