UNIT 17 MOTOR CONTROL
... NEC Table 430-91 gives NEMA enclosure types for motor starters, listing the outdoor and indoor conditions ...
... NEC Table 430-91 gives NEMA enclosure types for motor starters, listing the outdoor and indoor conditions ...
Selecting Effective Lighting Control White Paper
... and disconnect power to lights and/or general loads during sustained reduction or complete loss of control voltage. This change of state during loss of power is critical for applications or processes that require inspection prior to start up. Thus, electrically held lighting contactors are well suit ...
... and disconnect power to lights and/or general loads during sustained reduction or complete loss of control voltage. This change of state during loss of power is critical for applications or processes that require inspection prior to start up. Thus, electrically held lighting contactors are well suit ...
Wiring Manual | 2011
... The safety of people and machines must be taken into account for the total lifecycle of a machine/system. For personnel protection safety components such as position switches, light curtains, two-hand control switches or emergency switching off pushbuttons come into use. The safety information is mo ...
... The safety of people and machines must be taken into account for the total lifecycle of a machine/system. For personnel protection safety components such as position switches, light curtains, two-hand control switches or emergency switching off pushbuttons come into use. The safety information is mo ...
PowerVac Switchgear Application Guide
... A single rollout in “A” or “B” compartment will be located as shown in the third view. A fused rollout in “A” compartment is available as bus connected only. The upper rollout in “A” compartment can be bus connected as long as the lower rollout n “A” compartment is bus connected. The lower rollout i ...
... A single rollout in “A” or “B” compartment will be located as shown in the third view. A fused rollout in “A” compartment is available as bus connected only. The upper rollout in “A” compartment can be bus connected as long as the lower rollout n “A” compartment is bus connected. The lower rollout i ...
DC Machines
... pole which obviously means slots 5 to 8 are under south pole, slots 9 to 12 are under north pole and slots 13 to 16 under south pole. The poles are shown with shaded areas above the active lengths (coil sides) of the coils. Considering generator mode of action and direction of motion from left to ri ...
... pole which obviously means slots 5 to 8 are under south pole, slots 9 to 12 are under north pole and slots 13 to 16 under south pole. The poles are shown with shaded areas above the active lengths (coil sides) of the coils. Considering generator mode of action and direction of motion from left to ri ...
SafeC 200 SafeC 400 Safety Controller
... Besides the different hardware versions (chapter 5.1.2) the SafeC 200 and SafeC 400 controller modules are also available with different configurations. These configurations distinguish themselves in the action of the individual safety components. This means that the configurations define which safe ...
... Besides the different hardware versions (chapter 5.1.2) the SafeC 200 and SafeC 400 controller modules are also available with different configurations. These configurations distinguish themselves in the action of the individual safety components. This means that the configurations define which safe ...
Technical guide Protection criteria for medium voltage
... must be considered, particularly in the case of a ring distribution with grounded network with low fault currents. In fact, where the setting threshold of the ground protections is a few Amperes, the risk is systematic false tripping of the protections due to problems linked with construction of the ...
... must be considered, particularly in the case of a ring distribution with grounded network with low fault currents. In fact, where the setting threshold of the ground protections is a few Amperes, the risk is systematic false tripping of the protections due to problems linked with construction of the ...
UFGS 26 11 13.00 20 Primary Unit Substations
... NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. The Guide Specification technical editors have designated those items that require Government approval, due to their compl ...
... NOTE: Review Submittal Description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. The Guide Specification technical editors have designated those items that require Government approval, due to their compl ...
Relay
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called ""protective relays"".