I have a problem when jogging the z axis if I move at 100% feed rate in the - it travels about 6 inches and starts to run and the brake comes on and I get this message checked the driver and the over volts light on to clear this I have to turn power of to the machine but if I jog at 60%feed rate no problem also I have no problem with jogging at 100 % in the + anyone got any idea where I should start to look