The majority of dock lift control stations are electrically operated to both raise and lower the platform, so if there is a power failure the control buttons will not operate the lift table. If the dock lift is in the elevated position when the power failure occurs you will not be able to lower the dock lift unless the power unit is equipped with an optional manual lowering valve. The manual lowering valve would be located on the power unit, and when opened, the hydraulic oil in the lift cylinders will be directed back to the reservoir. This will permit the table to lower. Contact your Pentalift Sales Representative for more information.