Chapter 15 Daily and Periodic Inspection

(4)Life of the battery

• The battery life time is shown below.

Battery life time (total power off time) [Hr] *

Guaranteed value (Min.) @55°C

Actual value (Max.) @25°C

9,000

18,000

*Battery life time has been changed since Oct. 2002 production (MFG NO.02Jxx) due to hardware modification.

The battery life can be determined by checking for the flashing of the OK lamp.

The battery life time flag is in the bit special internal output “R7D9.” An example of a circuit using “R7D9” is shown below.

R7D9Y00100

The battery error can be output to external output Y00100 by using

Y00100

the ladder shown to the left.

*R7EE is a bit to enable battery error detection. Be sure to set R7EE if battery is used.

Figure 15.1 Battery error detection circuit

The self-diagnostic error code “71” indicates that the battery is not loaded or that it has reached its life.

Exchange the battery every two years even if it is still functional.

Use the battery within one year after purchase.

(5)How to replace the battery

Blue

 

Red

Connector on battery side

 

 

-

+

 

Figure 15.2 Replacing battery

1] Prepare a new battery (EH-MBAT).

2] Replace the battery while the power supply to the basic base is turned on.

3] Remove the old lithium battery from the battery case.

4] Insert the new battery and connect the cable to the CPU module. Insert it so that the red lead is , and the black lead is .

5] Fold the excess lead and store it in the lead storage space.

(If excess lead is not stored properly, the wire may get caught on the front cover and be severed.)

*When exchanging while the basic unit power turned off, perform steps 4], 5] and 6], in less than 30 minute.

Caution on handling the battery

Be careful when replacing the battery, since incorrect replacement may cause the battery to explode. Use EH-MBAT for new batteries.

Batteries that have been replaced should be individually placed in a suitable plastic bag (to prevent shorting) and a disposal company should be requested to dispose of them.

At this time, do not short the batteries, throw them in a fire, dismantle them, exert external force, expose them to water, charge them or cut the lead wires since doing so leads to the risk that the batteries will ignite, explode or burn up.

15-2

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Hitachi NJI-350B manual Life of the battery, How to replace the battery, 15-2