Introduction - YASKAWA E7N Technical Manual

Introduction

This Section describes the applicability of the Manual
Product Description
The E7N Bypass unit provides a means of bypassing the Drive while allowing the motor to operate at full speed, directly from
the AC line. It incorporates an AC Drive and two contactor Bypass arrangement in a single UL listed enclosure. The two
electrically interlocked IEC rated contactors isolate the Drive from the load when operating in Bypass mode.
Control logic provides industry standard Hand/Off/Auto functions and safety circuit interlocks in both drive and Bypass
operating modes.
E7N Bypass components include: a fused 120 VAC control circuit transformer, an input disconnect, motor overload relay,
control keypad and indicating lights.
The E7 Drive, a component of the E7N Bypass package, is a Pulse Width Modulated Drive for 3-Phase AC induction motors.
This type of Drive is also known as an Adjustable Frequency Drive, Variable Frequency Drive, AC Drive, AFD, ASD, VFD,
and Inverter. In this manual, the E7 Drive will be referred to as the "Drive".
The Drive is a variable torque AC drive, designed specifically for HVAC applications in building automation, including fans,
blowers and pumps. A new benchmark for size, cost, performance, benefits, and quality, the Drive includes numerous
built-in features such as network communications, H/O/A, PI, parameter storage and copy functions.
The Drive has embedded communications for the popular building automation protocols, Johnson Controls Metasys N2 and
®
Siemens APOGEE™ FLN, as well as Modbus . An optional L or BACnet interface card is also available.
ONWORKS
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The LED keypad/operator is equipped with Hand/Off/Auto functions and copy feature. User parameter settings can be recov-
ered at any time via "User Initialization". Optional DriveWizard software allows upload/download, as well as graphing and
monitoring of drive parameters from a PC for ease of drive management.
Built-in PI control eliminates the need for closed loop output signals from a building automation system. It includes feedback
display, inverse, square root and differential control functions, and maintains setpoint for closed loop control of fans and
pumps for pressure, flow, or temperature regulation.
This manual is applicable to E7 Drives defined by model numbers CIMR-E7U_ _ _ _ contained within Bypass units defined
by model numbers E7N_ _ _ _.
This manual is subject to change as product improvements occur. The latest version of the manual can be obtained from the
Yaskawa website www.yaskawa.com . The date shown on the rear cover is changed when revisions are made.
Introduction iii
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