Toshiba T300MVi MEDIUM VOLTAGE, Instruction Manual

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INTERFACE (cont’d)
[Setting examples]
•
Example 1: When a 0~8V (0 to 100%) speed reference is input to AIN1.
Set the input jumpers as per the drawings for single ended voltage input.
Set a 0 to 100% (count 0 to 25000) speed reference signal at 0 to +8 V so that it is stored in SP_REF_AIN1.
The input characteristic is shown in the right hand figure.
Set as follows:
AIN1_GS
= [25000count x 10v/(10v-2v)] = 31250
AIN1_OS = 0
AIN1_AS = SP_REF_AIN1 or 2
AIN1_TYPE = 1
Input Characteristic Example
Example 2 When a 4~20 mA (0 to 100%) speed reference is input to AIN1, it is recommended
that a 4-20mA/0-10VDC transducer be used. If the source is isolated, a 510Ohm burden resistor may also
be used. This would give 2V at 4mA. In this case an offset would need to be set in the drive as follows:
AIN1_GS
= [25000count x 10v/(10v-2v)] = 31250
AIN1_OS = -[31250counts x 2v/10v] = -6250
AIN1_AS = SP_REF_AIN1 or 2
AIN1_TYPE = 1
When using 4-20mA input and a burden resistor, it is possible that the reference will become
negative if the input falls below 4mA. If this happens, the drive could run in reverse. To stop this, the
reverse speed limit (LMT_SP_R) should be set to zero, if possible. If this can not be done due to the need
for reverse jogging, the parameter LMT_SP_MIN should be set to 0 or higher. This limit fixes the speed
reference from the keypad or the analog inputs to a minimum value.
Analog Output
General-purpose Analog Output
Three channels (AOUT1, 2, and 3) are provided as general-purpose,
±
10VDC analog output from
the XIO board. These outputs are directly output from the control board. The device reading these signals
must be isolated. To insure this, it is recommended that signal isolators be used. The output can be
selected from a list shown in the parameter setting manual by using the parameters AOUT1-3_CODE. They
may also be set to any function in the drive by the use of the parameters AOUT1-3_OP_AS, AOUT1-
3_OP_GS, and AOUT1-3_OP_OS. When using the optional settings, care must be taken to set the output
up so that the output signal does not exceed
±
10V. Exceeding this value will cause overflow problems.
25000
-25000
-8V
8V
Input
Voltage
Input
Count