Replacement Of Internal Battery - Grundfos CU 401 Instrucciones De Instalación Y Operación

8. Replacement of internal battery

(expected service life 3 years)
Battery
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• Switch off the power supply to the CU 401.
• Turn the locking screw to "slide position".
Use a 6 mm screwdriver for slotted screws.
• Push the modules, which are placed next to the CU 401 and
have contact via module bus, away from the CU 401
(approx. 15 mm to each side).
• Remove the terminals and turn the locking screw to position
"unlocked".
• Remove the CU 401 unit from the DIN rail by lifting it out at
the bottom.
• Turn the CU 401 unit upside down.
Place the battery so that the text is visible.
.
The battery is kept into place by four locking elements.
• Use a small screwdriver or a similar tool to lift the battery out
of the CU 401.
Note: The tool used should not be made of a conducting mate-
rial and it must be suitable for a straight slot.
Slide position
Locked Unlocked
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