Eurotherm Drives 590 DRV Digital, Product Manual

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Appendix D I/O Configuration - System Menu
590 DRV Digital DC Drive Product Manual App. D - 13
D
Digital Inputs - Examples
Digital inputs can be connected to read/write parameters only. These inputs are useful for switching states of LOGIC
parameters. LOGIC parameters are those whose ranges are ON/OFF, TRUE/FALSE, ENABLED/DISABLED, etc.
They can also send two fixed values to a VALUE parameter as determined by the state of the input terminal.
Using digital inputs with LOGIC parameters
The default connections in the 590 DRV Digital drive allow the digital inputs to switch LOGIC parameters. These are
the connections from terminal C6 to tag 90 (BIPOLAR CLAMPS), C7 to tag 118 (RAMP HOLD), and C8 to tag
119 (I DMD. ISOLATE). In each case, the state of the terminal switches the destination parameter on or off by
sending a 1 or 0. Since the format of the VALUE FOR TRUE and VALUE FOR FALSE parameters is in percent, 0 is
equal to 0.00% and 1 is equal to 0.01%.
Inverting the Input Signal
1. Set CONFIGURE I/O::CONFIGURE ENABLE to ENABLE.
2. Set DIGIN 1 (C6)::VALUE FOR TRUE to 0.00%.
3. Set VALUE FOR FALSE to 0.01%.
4. Reset CONFIGURE I/O::CONFIGURE ENABLE to DISABLE.
Digital input 1 now sends a 0 when the input signal is TRUE and 1 when it is FALSE.
Figure D.10 - Inverted Signal Using a Digital Input
Connecting digital input 1 to speed loop prop gain
1. Set CONFIGURE I/O::CONFIGURE ENABLE to ENABLE.
2. Find the tag number for the speed loop prop gain in the parameter list in Appendix I. (It is 14.)
3. Set DIGIN 1 (C6)::DESTINATION TAG to 14.
4. Set VALUE FOR TRUE to 10.00.
5. Set VALUE FOR FALSE to 30.00
6. Reset CONFIGURE I/O::CONFIGURE ENABLE to DISABLE.
Digital input 1 now sets SPEED LOOP::PROP. GAIN to two values depending upon its state. When it is HIGH,
PROP. GAIN is at 10.00 and when LOW, PROP. GAIN is at 30.00.
Figure D.11 - Changing a Value Parameter Using a Digital Input