This article deals with non-minimal phase systems, which are characterized by unstable zeros in the transfer function. Such systems are more difficult to control because they can cause opposite transient phenomena than expected. In addition, time delays occur in many technical applications, which complicates the design of the controller. To model this, the paper uses Padé approximation, which allows the delay to be replaced by a rational transfer function. The aim of the article is to analyze the influence of non-minimum phase characteristics and delay on system behavior.