Hitachi Sj7002 Owners Manual

“A” Group: Standard Functions
Configuring Drive Parameters
3–28
Target Frequency 
OperationAnalog Input Calculate Function –  The inverter can mathematically combine two input 
sources into one value. The Calc ulate function can either add, subtract,  or multiply the two 
selected sources. This provides the flexibility  needed by various applications.You can use the 
result for the output frequency setting (use  A001=10) or for the PID Process Variable (PV) 
input (use A075=03).
A105 [OI]–[L] input start...

SJ7002 Inverter
Configuring Drive Parameters
3–29
Elevator Accel/
Decel CurvesParameters A150 to A153 affect the slope of th e acceleration and deceleration for the elevator-
related S curves.
A143 Calculation symbol ADD00ADD (A input + B input) 00 00 00✘ ✔
Calculates a value based on 
the A input (A141 selects) 
and the B input (A142 
selects) SUB
0 1SUB (A input – B input)
MUL
02MUL (A input x B input)
A145 ADD frequency — — 0.00 to 99.99, 100.0 to 400.0 (Hz) 0.00 0.00 0.00 ✘ ✔
A146 ADD direction...

“B” Group: Fine-Tuning Functions
Configuring Drive Parameters
3–30
“B” Group: Fine-Tuning Functions
The “B” Group of functions and parameters adjust  some of the more subtle but useful aspects 
of motor control and system configuration.
Automatic 
Restart Mode and 
Phase LossThe restart mode determines how the inverter will resume operation after a fault causes a trip 
event. The four options provide advantages fo r various situations. Frequency matching allows 
the inverter to read the motor speed by...

SJ7002 Inverter
Configuring Drive Parameters
3–31
CAUTION:  When a loss of phase occurs, increased ri pple current will markedly reduce main 
capacitor life over time. Diode bridge failure ca n also result. If phase loss occurs under load, 
the inverter could be damaged. Please pay partic ular attention to the setting of function B006.
B002 Allowable under-voltage power failure time 0.3 to 25.0 (seconds) 1.0 1.0 1.0✘ ✔
The amount of time a power input under-voltage  can occur without tripping the power...

“B” Group: Fine-Tuning Functions
Configuring Drive Parameters
3–32
Electronic 
Thermal Overload 
Alarm SettingThe thermal overload detection protects 
the inverter and motor from overheating 
due to an excessive load. It uses a current/
inverse time curve to determine the trip 
point. The thermal overload alarm [THM] 
is the resulting intelligent output.
First, use B013 to select the torque 
characteristic that matches your load. 
This allows the inverter to utilize the best 
thermal overload...

SJ7002 Inverter
Configuring Drive Parameters
3–33
Example 3, setting for SJ700-3150LFE2 (185 to 
400kW) - The rated motor current is 600A. The 
setting range is (0.2 * 64)  to rated current, or 120A 
to 600A. For a setting of  B012 = 600A (current at 
100% rated current), the curve is shown to the 
right.
The electronic thermal characteristic adjusts the 
way the inverter calculates thermal heating, based 
on the type of load connected to the motor, as set 
by parameter B013.
CAUTION:  When the motor...

“B” Group: Fine-Tuning Functions
Configuring Drive Parameters
3–34
Constant Torque Characteristic  – Select-
ing the constant torque characteristic for the 
example motor gives the curves below. At 
2.5 Hz, the output current is reduced by a 
factor of 0.9 for given trip times.
Free Thermal Characteristic  - It is possible to set the electronic thermal characteristic using a 
free-form curve defined by  three data points, according to the table below.
The left graph below shows the region for possi ble...

SJ7002 Inverter
Configuring Drive Parameters
3–35
Suppose the electronic thermal setting (B012) is  set to 44 Amperes. The left graph below shows 
the effect of the free setting torque characterist ic curve. For example, at (B017) Hz, the output 
current level to cause overheating in a fixed time period is reduced by a factor of (B018). The 
right graph below shows the reduced trip current  levels in those conditions for given trip times.
Any intelligent output terminal may be programmed to indicate a...

“B” Group: Fine-Tuning Functions
Configuring Drive Parameters
3–36
Overload
RestrictionIf the inverter’s output current exceeds a 
preset current level you specify during 
acceleration or constant speed, the 
overload restriction feature automati-
cally reduces the ou tput frequency to 
restrict the overload. This feature does 
not generate an alarm or trip event. You 
can instruct the inverter to apply 
overload restriction only during 
constant speed, thus allowing higher 
currents for acceleration....

SJ7002 Inverter
Configuring Drive Parameters
3–37
NOTE:  Two sets of overload restricti on parameters are available. The set that is in use may be 
selected by means of an intelligent input terminal (see “Overload Restriction” on page 4–29).
B030 Restart freq. select for 
active freq. matching CUTOFF00Frequency at last shutoff
00 00 00✘ ✔
MAX
0 1Maximum frequency
SET
02Set frequency
Func. CodeName/
Description
Keypad
Range and Settings
DefaultsRun 
Mode Edit
Lo HiSRWOPEFEF2FE2
(EU)
FUF2FU2
(USA)
FF2F2...