Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 194)

Glossary-7
International Standards An organization established to promote development of international standards.
Organization (ISO)
Isolation Transformer A transformer that electrically separates the drive from the AC power line. An
isolation transformer provides the following advantages:
1. In DC motor applications, it guards against inadvertent grounding of plant
power lines through grounds in the DC motor armature circuit.
2. Enhances protection of semiconductors from line voltage transients.
3. Reduces disturbances from other solid state control equipment such as drives
without isolation transformers, time clock systems, electronic counters, etc.
Jogging Jogging is a means of accomplishing momentary motor movement by repetitive
closure of a circuit using a single pushbutton or contact element.
Joule 1. The work done by the force of one newton acting through a distance of one
meter.
2. The energy required to transport one coulomb between two points having
potential difference of one volt.
Jumper A short conductor with which you connect two points.
K 1K = 2
10
= 1024. A prefix used as a multiple for bits, bytes, or words in denoting
size of a block of data or memory. Example: 2K bytes = 2048 bytes.
Latching Relay A relay that maintains a given position by mechanical or electrical means until
released mechanically or electrically.
LCD Liquid crystal display, which is a reflective visual readout device commonly used
in digital watches and laptop computers.
Leakage Current In a switching device, the current that continues despite the fact that the device is
turned off. This occurs with solid-state switching devices and filters for hard
contact switching devices.
LED Light-emitting diode.
Limit Switch An electrical switch actuated by some part and/or motion of a machine or
equipment contacting the switch.
Line Conductor or set of conductors for carrying signals or power.
Locked Rotor Current Steady state current taken from the line with a rotor at standstill (at rated voltag
and frequency). This is the current when starting the motor and load.
Locked Rotor Torque The minimum torque that a motor will develop at rest for all angular positions of
the rotor (with rated voltage applied at rated frequency).