Hitachi Sj7002 Owners Manual

Inverter Specifications
Geting Started
1–10
General
SpecificationsThe following table (continued on next page) applies to all SJ7002 inverter models.
ItemGeneral Specifications
Protective enclosure  *1, *11 IP20 (NEMA 1); models -750xFU2 to -4000xFU2 is IP00
Control method Line-to-line sine wave pulse-width modulation (PWM) control
Output frequency range  *4 0.1 to 400 Hz
Frequency accuracy Digital command: ± 0.01% of the maximum frequency
Analog command: ± 0.2%  (at 25 °C  ± 10 °C)
Frequency setting...

SJ7002 Inverter
Getting Started
1–11
Output
signalIntelligent Outp
ut terminals
(assign six functions to five 
open collector outputs and 
one relay NO-NC contact) RUN (run signal), FA1 
(Frequency arrival type 1 – constant speed), FA2 (Frequency 
arrival type 2 – over-frequency), OL (overl oad advance notice signal 1), OD (Output 
deviation for PID control), AL  (alarm signal), FA3 (Frequency arrival type 3 – at-
frequency), OTQ (over-torque signal), IP (Instantaneous power failure signal), UV...

Inverter Specifications
Geting Started
1–12
Signal RatingsDetailed ratings are in “Specifications of Control and Logic Connections” on page 4–9.  
DCL Filter 
SpecificationsDirect reactor filters (DCL) are available for the Hitachi high-capacity SJ7002 inverters, models 
-1850HFU2 to -4000HFU2. The DCL specif ications are in the following table.
Carrier 
Frequency 
DeratingThe maximum carrier frequency Fcthat provides full inverter rated output depends on the 
particular inverter model. However, you may...

SJ7002 Inverter
Getting Started
1–13
NOTE: When replacing an SJ300 inverter combined with LCR filter, please check the type 
code of LCR filter and consult for compatibility (75 to132kW).
400V Class Inverters
Capacity 
(kW)Maximum  F
c  (kHz)Derating at 
Maximum FcCapacity  (kW)Maximum  F
c  (kHz)Derating at 
Maximum Fc
0.75 15 100% 37 8 80% (60.0A or less) 1.5 15 100% 45 9 75% (68.2A or less)
2.2 15 100% 55 6 60% (67.2A or less)
3.7 15 100% 75 6 85% (126.7A or less)
5.5 15 100%904 75% (132.0A or less)...

Introduction to Variable-Frequency Drives
Geting Started
1–14
Introduction to Variable-Frequency Drives
The Purpose of 
Motor Speed 
Control for 
IndustryHitachi inverters provide accurate speed control for 3-phase AC induction motors. You connect 
AC power to the inverter, and connect the inverter  to the motor. Many applications can benefit 
from the use of variable-speed drives in several ways:
 Energy savings - HVAC
 Need to coordinate speed with an adjacent process - te xtiles and printing presses...

SJ7002 Inverter
Getting Started
1–15
vector is related to motor flux current, and the other to motor torque current. The ability to 
separately control these two vect ors is what allows the SJ700
2 to deliver extraordinary low-
speed performance and speed control accuracy.
Inverter Input and 
Three-Phase 
PowerThe Hitachi SJ7002 Series of inverters includes two sub-groups: the 200V class and the 400V 
class inverters. The drives  described in this manual may be used in either the United States or...

Introduction to Variable-Frequency Drives
Geting Started
1–16
Intelligent 
Functions and 
ParametersMuch of this manual is devoted to describing how 
to use inverter functions and how to configure 
inverter parameters. The inverter is microproces-
sor-controlled, and has many independent 
functions. The microprocessor has an on-board 
EEPROM for parameter storage. The inverter’s 
front panel keypad provides access to all 
functions and parameters , which you can access 
through other devices as  well....

SJ7002 Inverter
Getting Started
1–17
Acceleration and deceleration settings 
specify the time required to go from a stop to 
maximum frequency (or visa versa). The 
resulting slope (speed change divided by 
time) is the acceleration or deceleration. An 
increase in output frequency uses the accel-
eration slope, while a decrease uses the 
deceleration slope. The accel or decel time a 
particular speed cha nge depends on the 
starting and ending fre quencies. However, 
the slope is constant, corresponding...

Frequently Asked Questions
Geting Started
1–18
Frequently Asked Questions
Q.What is the main advantage in using an invert er to drive a motor, compared to alternative 
solutions?
A. An inverter can vary the motor speed with  very little energy loss, unlike mechanical 
or hydraulic speed control solutions. The re sulting energy savings can often pay for 
the inverter in a relatively short time.
Q. The term “inverter” is a little confusing,  since we also use “drive” and “amplifier” to 
describe the...

SJ7002 Inverter
Getting Started
1–19
Q.What type of motor is compatible with the Hitachi inverters?
A. Motor type  – It must be a three phase AC induction motor. Use an inverter-grade 
motor that has 800V insulation for 200V cl ass inverters, or 1600V insulation for 
400V class.
Motor size  – In practice, it’s better to find th e right size motor for your application; 
then look for the inverter to match the motor.
NOTE: There may be other factors that will affect  motor selection, including heat...