7-3
Section
Maintenance of the NT620S/620C
275
7. Fit the CFL case lid and secure it with the screw.
First engage the protrusion at the left end of the lid with the opening in the
NT620C, then close the lid while keeping them engaged. Be careful not to
trap the backlight cord when closing the lid.
8. Switch the power ON and confirm that operation is correct when the tests on
the items indicated below are performed under I/O CHECK in the mainte-
nance mode. Also carry out a test to check communication with the host.
S
Touch switches
S
Backlight
9. Provided correct operation is confirmed in all of the tests in (8) above, start
operation.
CAUTIONS WHEN REPLACING THE BACKLIGHT
When replacing the backlight (CFL unit), observe the following precautions.
1. Carry out the replacement work at a location where there is no possibility that dust or
foreign matter will enter the unit, or that water droplets will get onto it. Discharge static
electricity from your body before starting the replacement procedure.
2. The optimum tightening torque for securing the CFL unit is 0.1 N
@
m. That for the rear
case is 0.4 N
@
m, and that for the terminal block and cables is 0.5 N
@
m.
7-3-2 Replacing the Battery
The NT620S/620C uses a lithium battery to back up the memory contents.
The battery life is 5 years if the NT620S/620C is used in a location where the am-
bient temperature is 25
_
C. If the temperature at the location of use is higher than
this, the battery life will be shorter. Change the battery at suitable intervals in ac-
cordance with the operating environment of the NT620S/620C.
It is advisable to keep a spare battery so that the battery can be replaced immedi-
ately if replacement becomes necessary.
S
Battery type
C500-BAT08
S
Battery replacement clues
Replace the battery in the following cases. The battery must be replaced within
5 days.
- When 5 years have passed since the installation of a new battery.
- When the RUN LED is lit in orange (during operation) or in red (when
stopped).
- When the “Battery Lowered” message is displayed on switching on the pow-
er or resetting the NT620S/620C.
- When “Battery Lowered” is displayed on performing the “Battery” check in
the I/O CHECK menu in the maintenance mode.
S
Battery replacing method
Replace the battery by following the procedure given below.
To protect the contents of the memory, the battery must be replaced in less than
5 minutes.
Caution
Never short the battery terminals, attempt to charge the battery or take it apart,
heat it, or discard it into fire. In the worst case, explosion may occur.
Summary of Contents for NT620C
Page 1: ...Cat No V033 E1 5 Programmable Terminals NT620S 620C OPERATION MANUAL...
Page 2: ...NT620S 620C Programmable Terminals Operation Manual Revised April 2001...
Page 3: ...iv...
Page 5: ...vi...
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