Rockwell Automation Allen-Bradley CENTERLINE 2500, Инструкция по эксплуатации

Страница: 9 / 88

Publication 2500-IN001A-EN-P - May 2006
iii
Trunk line – Main DeviceNet communication cable within the motor control
center.
Unit – An arrangement of power and/or control devices that are housed
together and inserted into a column. A unit may be used to distribute power or
control a remote device. The size of units is described by module space.
Unit main switch – Disconnecting means for a unit within a motor control
center. Available in two types: circuit breaker or fused disconnect.
Withdraw lever – Mechanism used to insert and remove withdrawable units.
The withdraw lever is used to select an operating position (inserted, test,
disconnected, and withdrawn) and has mechanical detents to ensure that the
lever is securely in position. (Figure 6.10)
Withdrawable unit – Unit where line, load, control, network and PE
connections are made using stabs or connectors. Withdrawable units are
inserted and removed using the withdraw lever.
Withdrawn position – Plug-in unit operating position in which line, load,
control, network, and Protective Earth (PE) connections are disengaged and
the unit is removed from the column. For more information refer to
Chapter 6
– Unit Information .