# Robot speed varies throughout the operation time

**URL:** <https://tech-community.robotics.abb.com/t/robot-speed-varies-throughout-the-operation-time/15214>\
**Category:** General\
**Created:** [November 4, 2026, 4:21pm UTC](https://tech-community.robotics.abb.com/t/robot-speed-varies-throughout-the-operation-time/15214 "2026-11-04T16:21:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NIRAJ\_PATEL](https://avatars.discourse-cdn.com/v4/letter/n/cdc98d/32.png) [@NIRAJ\_PATEL](https://tech-community.robotics.abb.com/u/NIRAJ_PATEL)\
**Post date:** [November 4, 2026, 4:21pm UTC](https://tech-community.robotics.abb.com/t/robot-speed-varies-throughout-the-operation-time/15214/1 "2026-11-04T16:21:34Z")

</div>

We just installed IRB 4600-40/2.55  
3000-310 Controller variant: OmniCore V250XT

3026-2 EtherNet/IP Safety Device: CIP Safety Adapter

While the robot is in operational mode. Cycle time varies between 35 seconds to 39 seconds. There is quick acceleration after robot runs for a while about an hour or two later.

What can I ask my automation team to look into to make it a consistent operational run?

Best regards,

Niraj