Linear electric actuator proves successful solution for power station damper upgrade
The Dynergy-Hennepin power station in central Illinois has switched to LA-2520 model linear modulating actuators for boiler fan inlet and outlet dampers.
Faced with the choice of linear or rotary electric actuator designs, maintenance staff at the station decided that the linear LA-2520 would be easier to install and maintain. With a small footprint, it can be mounted with minimal adaptation, sometimes taking up no floor space at all. With some damper designs there is not enough framework to which to mount a rotary actuator; in other cases the damper can be in an area where a pedestal mounted actuator is not a practical option. These problems can be overcome with the LA-2000 Series, which, with its built-in servo amp delivers reliable and accurate control within a compact enclosure at an economic cost.
At Dynergy-Hennepin a fabricated mounting pedestal was supplied by the plant which attached to the rear clevis of the actuator, whilst the drive end clevis was supplied as a forked design to connect directly to the existing damper shaft crank arm. This has become a standard option for the LA-2000 Series. The internal servo amplifier is controlled by a 4-20mA signal and provides position feedback to the station’s control room.