Hitachi Sj7002 Owners Manual

Using Intelligent Input Terminals
Operations
and Monitoring
4–30
The figure below shows the operation during  an overload restriction event. The overload 
restriction level is set by B022 and B025. The overl oad restriction constant is the time to decel-
erate to 0Hz from maximum frequency. When this fu nction operates, the acceleration time will 
be longer than the normal acceleration time. 
NOTE: The Overload Advance Notice function for intelligent outputs is related to Overload 
Restriction operatio...

SJ7002 Inverter
Operations
and Monitoring
4–31
When the torque limit enable function [TL] is assigned to an intelligent input terminal, torque 
limiting occurs only when [TL] is ON. Both the  4-quadrant mode and terminal switching mode 
of torque limiting use input [TL] for enable/disab le. When the [TL] input is OFF, the inverter 
always uses the default torque control limit of  200% maximum. That torque limit value corre-
sponds to 200% of the maximum inverter output current. Therefore, the output...

Using Intelligent Input Terminals
Operations
and Monitoring
4–32
External Brake 
Control Function   The External Brake Control function enables the inverter to control external electromechanical 
brake systems with a particular safety characteristic. For example, elevator control systems 
maintain the brake on the load until the drive motor has reached a  releasing frequency (point at 
which the external mechanical brake is released).  This ensures that the load does not have an 
opportunity to begin...

SJ7002 Inverter
Operations
and Monitoring
4–33
The following table lists the parameters related to the External Brake Control function.
The diagram below shows the event sequence de scribed in the steps on the previous page.
CodeFunctionData or RangeDescription
B120 Brake control  enable 00=Disable
01=Enable Enables external brake control function within the 
inverter
B121 Brake waiting  time for release 0.00 to 5.00 sec. Sets the time 
delay after arrival at release 
frequency (B125) before the inverter...

Using Intelligent Input Terminals
Operations
and Monitoring
4–34
Expansion Card 
Input Signals   Other inputs listed below require the expansion card SJ-FB Encoder Fe edback. Please see the 
SJ-FB manual for more information.
The diagram below shows how the Input/Output  connections for the SJ–FB feedback board. 
The inverter’s internal connections and paramete r configuration make these signals available on 
intelligent input and output terminals.
The information on outputs  related to the SJ-FB...

SJ7002 Inverter
Operations
and Monitoring
4–35
Force Terminal 
Mode   The purpose of this intelligent input is to allow a device to force the inverter to allow control of 
the following two parameters via the control terminals:
 A001 - Frequency source setting (01  = control terminals [FW] and [RV])
 A002 - Run command source setting (0 1 = control terminals [O] or [OI])
Some applications will  require one or both settings above to use a source other than the 
terminals. You may prefer to normally use...

Using Intelligent Input Terminals
Operations
and Monitoring
4–36
The following block diagram shows the torque control operation. If the measured speed 
exceeds the speed limit, the motor speed is  controlled in proportional control mode.
Clear Cumulative 
Power Value   When D015 cumulative power monitoring functi on is selected, the inverter displays the 
cumulative value of electric power input to the inverter. You can also convert the value to other 
engineering units by setting th e related parameter...

SJ7002 Inverter
Operations
and Monitoring
4–37
Speed Servo ON  The servo-ON function allows you to set the inve rter in a speed-servo-lock state with an 
intelligent input during operation. This function is available when A044=05  vector control with 
sensor  for the characteristic V/f curve.
To use the servo-ON function, assign option code  54 to an intelligent input. After making the 
input assignment, the inverter will accept an  operation command only when the [SON] terminal 
is ON.
If the [SON]...

Using Intelligent Input Terminals
Operations
and Monitoring
4–38
General Purpose 
Inputs 1–8   Refer to the Easy Sequence Inst ruction Manual for information on  how to configure and use the 
general purpose inputs MI1 to MI8.
Analog Holding 
Command   The analog holding function causes the inve rter to sample and hold the analog command 
(external analog input). The hol d operation begins when the intelligent input [AHD] (assign 
option code 65) turns ON.  While [AHD] terminal is ON, th e Up/Down...

SJ7002 Inverter
Operations
and Monitoring
4–39
Multi-stage 
Position Select
1, 2, and 3   Three Multi-stage Position Select inputs are bina ry-encoded to select one of eight settings, 
P060 to P067. Input [CP1] is the LSB; [CP3] is  the MSB. If no position select inputs are 
assigned, P060 becomes the  default position setting.
The three multi-stage position select inputs [C F1, [CF2], and [CF3] are binary-encoded. When 
more than one input changes state to select a  position, it is possible that skewing...