Yaskawa P7B Drive Bypass - Manual (Page 5)

Introduction iii
Introduction
This Section describes the applicability of the Manual
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Product Description
The P7 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 three contactor Bypass arrangement in a single UL listed enclosure. The three
electrically interlocked IEC rated contactors isolate the Drive 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.
Bypass components include: a fused 120 VAC control circuit transformer, an input Motor Circuit Protector (MCP) circuit
breaker/disconnect, motor overload relay, selector switches and indicating lights.
The P7 Drive, a component of the P7 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 P7 Drive will be referred to as the “Drive”.
The Drive is a variable torque AC drive, designed specifically for HVAC applications, 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 communications for the popular protocols: DeviceNet, Profibus, Ethernet, etc. An optional L ON W ORKS®
interface card is also available.
The LCD keypad/operator is equipped with Hand/Off/Auto functions, copy feature, 7 language choices, and 5 lines of display
with 16 characters per line. User parameter settings can be recovered 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 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 P7 Drives defined by model numbers of CIMR-P7U_ _ _ _ contained within Bypass units
defined by model numbers of P7B_ _ _ _.
This manual is subject to change as product improvements occur. The latest version of the manual can be obtained from the
Yaskawa website
www.drives.com . The date shown on the rear cover is changed when revisions are made. The latest version
of Drive software is also shown.