Jung J630D, Manual

Page: 305 / 316

J630D
9. Maintenance / servicing / disposal 26.7.02 299
9.9 Replacing the battery (control unit)
The back-up voltage for the MMC 103 display and the NCU is monitored by the
control unit. If the monitor function is tripped, you must replace the battery within
six weeks.
You should replace the batteries once every two years at the latest for safety re-
asons.
When should the batteries be replaced?
A battery alarm appears on the display.
– Example: "2100 NCU battery voltage low" and the "BAF" LED in the con-
trol cubicle blinks.
– The buffered data is still intact.
• Do not switch off the control unit until you have replaced the battery.
• If you ignore the battery alarm, a battery fault will occur within the next six
weeks.
– Example: The message "2102 NCU battery alarm" appears on the display
and the "BAF" LED in the control cubicle lights up.
– The buffered data has been lost and you will have to restart the control unit
after you have replaced the battery.
9.9.1 Replacing the battery for the MMC 103 display
The back-up battery for the MMC 103 display (1) is located at the back of the con-
trol unit.
The door of the control cubicle must be opened and the control unit
switched on in order to replace the battery of the MMC 103 display. It
is therefore only allowed to be replaced by a qualified electrician.
Do not attempt to reactivate a discharged battery either by heating it
or by any other means. This could cause the battery to leak and/or
explode. Failure to comply could result in physical injury or in
damage to property.
If you are unable to acknowledge an error message relating to the
MMC 103 battery, you must not switch off the control unit under any
circumstances. Replace the batteries immediately.
Do not switch off the control unit until you have installed a new bat-
tery. If you do, all the buffered data will be lost and you will have to
re-commission the unit.