SIKOSTARTTM 3RW34 - Siemens Industry, Inc.

Installation3. When mounting the soft starter in an enclosure, the enclosure must be properly sized or ventilated to providecooling for the continuous power dissipation in the SCRs, approximately 3 watts per amp of continuous rating.The following vent areas are required for each inlet and each outlet on customer furnished enclosures, motorcontrol centers, etc.Order No. sq. in. cm 2 AEnglish3RW34 52/54 not required not required up to 57 A3RW34 55 - 65 20 129 up to 131 A3RW34 66 - 67 40 258 up to 248 A3RW34 68 - 83 80 516 up to 480 A3RW34 84 - 86 120 774 up to 960 ATable 4 : Ventilation Cross-SectionsLocate front ventilation air inlet vent at least 3 inches (75 mm) below the bottom edge of the soft starter. Locate theoutlet air vent area at least 6 inches (150 mm) above the unit's top edge. Air filters impede air circulation and requirea fan at inlet and/or outlet.5.3 Installation Precautions5.3.1 Soft Starter ProtectionThe following precautions are intended for use as guidelines for proper installation of the soft starter. Because of thevariety of applications, all of these precautions may not pertain to your system and they are not all-inclusive. Inaddition to the following, refer to codes and standards applicable to your particular system.WARNINGHazardous voltage.Can cause death, serious injury,or property damage.To avoid electrical shock, this soft starter MUST bewired with motor disconnecting means and branchcircuit protection because the soft starter does notprovide electrical isolation to the motor when the softstarter is OFF.DANGERHazardous voltage.Will cause death or serious injury.To avoid electrical shock or burn, do nottouch soft starter terminals when voltage isapplied to the soft starter. Output terminals willhave voltage present even when soft starter is OFF.When planning your installation, be aware of potential hazards to personnel and to the unit that can be caused bycontrol devices used in the system or by unique system features.Motor Disconnect. When any motor disconnect device connected to the soft starter output (motor) terminals isopened during operation, the soft starter continues to source full voltage if running. If the disconnect device isreclosed, the motor will be restarted at full voltage. When the disconnect device is opened, a hazardous voltage ispresent at the soft starter output terminals due to SCR and snubber leakage.Motor Start/Stop. For normal operation, the soft starter is designed to start and stop the motor with signals thatare input to the soft starter's circuitry. Do not use the device that disconnects and reapplies line power to the softstarter for ordinary starting and stopping of the motor.8 3ZX1012-0RW34-1AN1