MRJ2S-40A and BATTERY PROBLEM

[CHANDRU 0]

One of our machine which is recently imported is having a MRJ2S-40A Servo and the relevant motor connected to it is HC-MF-S43 and when checked the battery inside the servo is missing/not found . 1.IS IT NECESSARY TO HAVE A BATTERY inside the servo amplifier in order to keep the absolute position. or 2.The battery is optional. When going through the relevant manuals it is mentioned that all the HC series motors do need a battery connection in the servo. Pl help. CHANDRU

[plcdp 11]

Hello, As long as you re-home after a power interruption you shouldn't need a battery. -Dave

[JRoss 84]

The battery is used to keep power on the encoder when supply power is turned off so that the servo becomes an absolute system, with no rehoming required on power cycle. The battery is optional, but there is a parameter that must be changed from default to make use of the battery if you choose to do an absolute system.

[CHANDRU 0]

Thanks for both of you to respond. The problem what we are facing is when switched on the amplifier the motor tries to run but stops after not even completing a round. Can I use a battery and set the parameter no 50 to ooo1 switch on and off so that the servo can sense the absolute position and once equipment is ready for operation can i change it to 0. How the encoder is aligned with the motor or is there any problem with the encoder. The equipment is controlled by the PLC FX2N-10GM and there is no alarm/error in the plc.TOP NUMBER parameter no 50 abs interface effective parameter no 51 ABS INPUT TOP NUMBER PARAMETER NO 52 ABS OUTPUT CHANDRU

[Crossbow 296]

If the amplifier tries to run immediately when switched on, then your positioning module is commanding it to do so. That has nothing to do with the battery in the amplifier. When it stops, what error is indicated on the screen?

[JRoss 84]

The battery and parameter 50 simply tells the servo to keep the encoder position value updated during a power cycle. It does not affect other operations of the servo. Why would you want to switch it off and on? I concur with crossbow, if the servo is running, the positioning module is telling it to run.