Safety instructions Residual hazards 3 3.3 3.3 Residual hazards Protection of persons ƒ Before working on the controller, check that no voltage is applied to the power terminals, because – - depending on the controller - the power terminals U, V, W, +UG, -UG, Rb1 and Rb2 carry hazardous voltages for up to 3 to 20 minutes after mains disconnection. – the power terminals L1, L2, L3; U, V, W, +UG, -UG, Rb1 and Rb2 carry hazardous voltages when the motor is stopped. Device protection ƒ Plug on or pull off all pluggable terminals only in deenergised condition! ƒ Detach the controllers only in deenergised conditions from their installation backplanes or the back panel of the control cabinet!
ƒ Cyclic switching on and off of the mains voltage can overload and destroy the input current limitation of the controller: – Cyclic mains switching of 5-times in 5 minutes is permissible without restrictions. Motor protection ƒ Depending on the controller settings, the connected motor can be overheated by: – For instance, longer DC-braking operations. – Longer operation of self-ventilated motors at low speed. Protection of the machine/system ƒ Drives can reach dangerous overspeeds (e.g. setting of high output frequencies in connection with motors and machines unsuitable for such conditions): – The controllers do not offer any protection against such operating conditions.
Use additional components for this purpose. 3.3-1 EDS94SPP101 EN 1.0-12/2005