GE Senographe DS Manual page 386

GE Healthcare
Revision 1
Job Card LOTO A001 - Lock-Out / Tag-Out (LOTO) Procedures
8-7 Verify lamp electrical source is within safe limits
The cables between the XJ1, XJ2 and XJ3 connectors on the Generator Relay board contain a live volt-
age of up to 30V from an external source. This voltage is not harmful to people working on the Genera-
tor, however the source must be isolated and off when you undertake maintanance or corrective work so
that there is no risk of causing a short circuit which can damage the Generator or the external power
supplies.
For personnel safety, it is extremely important that you ensure that this voltage is no more than the val-
ues specified in the following steps.
1. Temporarily switch on the room lamp power source in the hospital.
!
Upto 24Vdc only
permitted on
XJ3 connector
2. Use a Digital Multimeter to ensure that the X-ray ON and Seno ON lamp cables voltage between the
XJ1 and XJ2 connectors on the Generator Relay board are at 30 V or less.
• If the voltage is above 30 V (AC or DC) then before you proceed with your planned maintenance
or corrective tasks you must ensure that the electical energy source which supplies power to the
X-ray ON and Seno ON lamp cables is changed so that no more than 30V (AC or DC) is supplied
to the Generator Relay board.
• If the voltage is 30 V (AC or DC) or less then proceed with your planned maintenance or correc-
tive tasks.
3. Close the room door to ensure that a voltage is present on the Relay board XJ3 connector. Use a
Digital Multimeter to ensure that the room door cables voltage between the XJ3 connector on the
Generator Relay board are at 24 Vdc or less.
• If the voltage is above 24 Vdc then before you proceed with your planned maintenance or correc-
tive tasks you must ensure that you must ensure that the electical energy source which supplies
power to the room lamp cables is changed so that no more than 24Vdc is supplied to the Genera-
tor Relay board.
• If the voltage is 24 Vdc or less then proceed with your planned maintenance or corrective tasks.
4. Isolate the power source of the room lamps that route electrical enegry into the Relay Board on the
Generator. The room lamps power source can vary in different hospitals, but typically you will need to
cut the power source circuit breaker or isolator.
Service Information and Procedures Class A 2385072-16-8EN
Page no. 386
Senographe DS
!
Upto 30V only
permitted on
XJ1 and XJ2
connectors
JC-LOTO-A-001.fm