Drager Babytherm 8000 Service Manual

Babytherm 8000 WB / OC and Radiant Heater 600 W
Electrical Safety Test according to UL 2601-1 in the USA and
Canada

Table of contents:

1. Babytherm 8000 WB / OC without Radiant Heater ........................................................2

1.1 Visual inspection of Babytherm 8000 WB OC.................................................................2

1.2 Safety Testing Mattress Heating with DNI Nevada Model µ-Test 2000..........................2

1.2.1 Chassis Resistance Testing ....................................................................................2

1.2.2 Enclosure Leakage Current (Chassis Leakage Testing)..........................................3

1.2.3 Earth Leakage Current (Ground Wire Leakage Testing) .........................................4

2. Radiant Heater 600 W ......................................................................................................6

2.1 Visual inspection of the RH 600...................................................................................... 6

2.2 Safety Testing RH 600 with DNI Nevada Model µ-Test 2000 .........................................6

2.2.1 Chassis Resistance Testing ....................................................................................6

2.2.2 Enclosure Leakage Current (Chassis Leakage Testing)........................................11

2.2.3 Earth Leakage Current (Ground Wire Leakage Testing) .......................................12

2.2.4 Patient leakage current from the sensor connection to earth.................................13

Babytherm 8000 Electrical Safety Test according to UL2601-1 November 2001 Page 1 of 14
RH 600 with DNI Nevada Model µ-Test 2000

1 Babytherm 8000 WB / OC without Radiant Heater

1.1 Visual inspection of Babytherm 8000 WB / OC

· Power cord of the Babytherm

· Height adjustment, compare fuses to stated ratings.

1.2 Safety Testing Mattress Heating with DNI Nevada
Model µ-Test 2000

· Warning: These tests can expose personnel to hazardous electric shock and must

be carried out with caution.

· Note: Do not plug the µ-Test 2000 safety analyzer power cord into a line isolation

monitor as inaccurate readings may occur.

· Ensure that the switch "TEST LOAD" on the backside of the µ-Test 2000 is in the

"IEC 601-1" position.

· Plug the µ-Test 2000 power cord into a live AC receptacle, place the power switch

of the µ-Test 2000 to the "1" or ON position and ensure that the switches marked
"NEUTRAL" and "POLARITY" are in the OFF or CLOSED position.

1.2.1 Chassis Resistance Testing

· Rotate "MODE" knob to "OHM RESISTANCE" position.

· Attach test lead to "CHASSIS CABLE" input of the tester.

· Plug the Babytherm power cord from the Electronics (not from the Radiant Heater,

if available) into the test receptacle of the µ-Test 2000.

Babytherm 8000 Electrical Safety Test according to UL2601-1 November 2001 Page 2 of 14
RH 600 with DNI Nevada Model µ-Test 2000

· Perform 2 tests with the alligator clip attached to the following test items of the

Babytherm 8000:

1) Screw at the base plate of electrical

height adjustment (if available)

2) Electronics housing of the mattress
heating (if available)

· The resistance reading then shown on the µ-Test 2000 is the "Chassis Resistance".
Bend and exercise the power cord to check for intermittent reading.

· Maximum allowable test values:

Chassis Resistance 0.2 Ohm

· Additional test for the Babytherm 8000 with installed mattress heating only:
Perform test with the probe attached to aluminum plate of the mattress heating.

Test value for the aluminum plate of the mattress heating:

Chassis Resistance infinity

· Afterwards connect alligator clip at test item 2), or if not available at test item 1).

1.2.2 Enclosure Leakage Current (Chassis Leakage Testing)

· Rotate "MODE" knob to "CHASSIS" position.

· Switch on Babytherm 8000 and allow the unit to complete the self test.

· Set up the µ-Test 2000 for the following tests by using the switches labeled

"Ground" and "Polarity".

Babytherm 8000 Electrical Safety Test according to UL2601-1 November 2001 Page 3 of 14
RH 600 with DNI Nevada Model µ-Test 2000

· This is a measurement of the leakage current from the Chassis to earth ground.

· Be sure to pause the "POLARITY" switch in the center-off position before changing

polarity.

· Activate height adjustment (if available) during every following test.

· Maximum allowable test values under Normal Condition:

Normal Ground, Normal Polarity, Closed Neutral: 100 µA
Normal Ground, Reverse Polarity, Closed Neutral: 100 µA

· Maximum allowable test values under Single Fault Condition:

Open Ground, Normal Polarity, Closed Neutral: 300 µA, but not 0 µA
Open Ground, Reverse Polarity, Closed Neutral: 300 µA, but not 0 µA

1.2.3 Earth Leakage Current (Ground Wire Leakage Testing)

· Remove the red lead with the alligator clip from the Babytherm 8000.

· Rotate "MODE" knob to "EARTH" position.

· Leave all other selections from the previous test the same.

· The Babytherm is still switched on.

· Set up the µ-Test 2000 for the following tests by using the switches labeled

"Neutral" and "Polarity".

· Important: Do not press "OPEN GROUND" pushbutton.

· This is a measurement of the leakage current flowing through the ground wire of

the power cord.

· Be sure to pause the "POLARITY" switch in the center-off position before changing
polarity.

· Activate height adjustment (if available) during every following test.

Babytherm 8000 Electrical Safety Test according to UL2601-1 November 2001 Page 4 of 14
RH 600 with DNI Nevada Model µ-Test 2000

· Maximum allowable test values under Normal Condition:

(Open Ground), Normal Polarity, Closed Neutral: 300 µA, but not 0 µA
(Open Ground), Reverse Polarity, Closed Neutral: 300 µA, but not 0 µA

· Maximum allowable test values under Single Fault Condition:

(Open Ground), Normal Polarity, Open Neutral: 300 µA
(Open Ground), Reverse Polarity, Open Neutral: 300 µA

· Switch off Babytherm.

· Remove the Babytherm power cord from the µ-Test 2000.

Babytherm 8000 Electrical Safety Test according to UL2601-1 November 2001 Page 5 of 14
RH 600 with DNI Nevada Model µ-Test 2000