Mitsubishi Electric Q170MSCPU User Manual page 194

6 INSPECTION AND MAINTENANCE
(h) Flowchart for when "BT " displays on 7-segment LED
"BT1" or "BT2" displays when the battery voltage is lowered.
"BT1" or "BT2" displays in the following cases.
• BT1: Battery voltage 2.7V or less
• BT2: Battery voltage 2.5V or less
The following shows the flowchart for when "BT " displays.
"BT " displays on 7-segment LED
Turn off the Motion controller's power
supply.
Replace the battery.
(Refer to Section 6.5.2.)
Turn on the Motion controller's power
supply.
Does "BT
disappear on 7-segment
LED (Confirm ON/OFF by
monitoring SM )
REMARK
If SM51 turns on, the contents of the data (Refer to Section 6.5.) in the RAM built-in
Motion controller cannot be guaranteed.
It is recommended to back-up the battery periodically.
"
NO (SM58 or SM51 ON)
YES (SM58, SM51 OFF)
END
6 - 27
A hardware fault
Explain the error symptom and get
advice from our sales representative.