Omron OMNUC FND Series User Manual page 112

Design and Installation
j Lithium Battery (Recommended Products)
With an absolute encoder, a battery must be used in order to retain position data when the power is
turned OFF.
Maker
Toshiba ER6V
OMRON (made by 3G2A9-BAT08
Hitachi Maxell)
Note 1. When power is turned OFF internally at the Position Driver, the battery voltage is not moni-
tored. Be careful not to let the voltage drop below 2.8 V. If necessary, install a battery voltage-
drop detection circuit or a monitor in the system.
Note 2. Use one battery for one Position Driver. (The estimated battery service life is calculated based
on this condition.)
Note 3. The Toshiba lithium battery does not have a connector for BAT connections. It is necessary to
separately purchase and attach a connector for BAT connections.
j Replacing the Battery
The following method can be used to replace the battery while retaining the absolute encoder's rotation
data.
1. Turn ON the Position Driver's power supply and leave it ON for three minutes. This will charge the
capacitor in the encoder.
2. Turn OFF the Position Driver's power supply and leave it OFF while replacing the battery. Connect
the battery between pins 2 and 3 of the Position Driver's BAT connector (CN6).
Note 1. After step 1 above has been implemented, the encoder will operate normally even with the
battery removed for up to two days (at 0 C to 40 C).
Note 2. While replacing the battery, be careful not to short-circuit the plus and minus terminals.
Note 3. When disconnecting the lead wires, disconnect the plus and minus terminals separately. Dis-
connecting them at the same time can cause them to short-circuit and create sparks.
Note 4. Be sure to use the prescribed method for disposing of used batteries. In particular, do not un-
der any circumstances dispose of them in a fire. Doing so may cause them to explode.
j Setting up the Absolute Encoder
Setup is required to set the amount of machine rotation to zero for trial operation of the Servomotor or
when the absolute encoder has been left disconnected from the battery for more than two days. (This is
because the voltage of the capacitor inside the absolute encoder will drop if a battery is left unconnected
for more than two days, possibly interfering with the proper operation of internal elements.)
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Model Voltage
3.6 V
3.6 V
Electrical capacity
2,000 mA h
1,650 mA h
Chapter 2
Estimated service life
Approx. 10 years
Approx. 7 years