Section 6.3 of the manual shows the kind of reversing circuit required, the drive doesn't do the reversing, an external circuit does the reversing by changing the polarity of the armature circuit of the motor, you need to take a look at your reversing circuit and work out why it isn't reversing the polarity.

You need to read this - http://www.lenze.org.ua/pdf/530_Spee...rs_1202_EN.pdf