Hitachi SJ-PB(T) instruction manual Action at communication error, Setting

CHAPTER 4 SETTING

4.2 Setting of controlling frequency and start/stop commands

The SJ300/L300P inverters can be configured to take reference set-points and commands from several different locations. Refer to the table below for information of how to configure the inverter so that the fieldbus controls frequency and the commands.

Control	Frequency Setting	Operation Setting
	Selection - A001	Selection - A002
SJ-PB(T) controls frequency and commands	2	1
SJ-PB(T) controls frequency only	2	Not equal to 1.
SJ-PB(T) controls commands only	Not equal to 2.	1
SJ-PB(T) has no control.	Not equal to 2.	Not equal to 1.

However, since the SJ-PB(T) module uses the “Terminal” to give commands and “Operator” to give references to the inverter certain steps must be taken in order to be able to control the inverter manually (not from fieldbus). Study the table below to see how the control word bits shall be set to accomplish control from fieldbus and from the user.

Controlling the inverter with			Control word bit settings
A001	= 2	(Operator),
A002	= 1	(Terminal).	10	12	13
SJ-PB(T) controls frequency and commands			1	0	0
SJ-PB(T) controls frequency only*			1	1	0
SJ-PB(T) controls commands only			1	0	1
SJ-PB(T) has no control.			1	1	1
			0	-	-

from the “Terminal” input when a SJ-PB(T) is present in the option slot. In order to do this, bit ten in the Control Word shall be set to zero. That is, by setting A001=2, A002=1, and control word bit 10=0 it is possible to control the inverter with the terminal while giving frequency reference from the fieldbus.

*Please note that when frequency reference is controlled from the fieldbus and commands from another location (such as “Terminal”) the direction of the motor must be controlled from the command source (Reverse/Forward command). In this case changing the sign of reference value cannot control the direction of the motor.

4.3 Action at communication error

In case of occurring transmission errors (communication cut-off with the master), the following actions can be selected.

Depending on what option slot the option module is connected to, P001 (Option 1) or P002 (Option 2) is changed.

P001/P002	Action at error detection		Remarks
0	Inverter will trip.	Option trip E6x or E7x.	Fault can be reset either from
			fieldbus or from keypad.
	Continue operation
1	according to the last	-	-
	received command.

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