Customizing Your Application 8-5MN762
8.2.3 Modbus Control Mode (P-07 = 3 or 4)
Table 8-3 Parameter P-08 Control of Digital Inputs when P-07=3 or 4
P-08 Digital In 1 (Term. 2) Digital In 2 (Term. 3) Digital In 3 (Term. 4) Analog Input 1 (Term. 6)
0, 2, 4-5,
8-12
Open Stop Open
No Effect
Open
No Effect No Effect
Closed Run Closed Closed
3
Open Stop Open Master Speed Ref Open Trip (Ext Trip)
No Effect
Closed Run Closed Preset Speed 1 Closed Run
6
Open Stop Open Master Speed Ref Open Trip (Ext Trip)
Analog Input Ref
Closed Run Closed Analog Input 1 Closed Run
7
Open Stop Open Master Speed Ref Open Trip (Ext Trip)
No Effect
Closed Run Closed Keypad Speed Ref Closed Run
For the drive to run, Digital In 1 must be closed and run and stop commands must be received on the RS485 link. Master
Speed Ref - start and stop controlled by RS485. Keypad Speed Ref - drive auto runs if Digital Input 1 closed, depending on
P-28 setting. For information on MODBUS RTU see Appendix E.
Connect an external PTC Motor Thermistor or similar user contact to Digital Input 3.
8.2.4 User PI Control Mode (P-07 = 5 or 6)
Factory Settings for Proportional Gain (P-38), Integral Time Constant (P-39) and Feedback mode (P-43) are suitable for many
HVAC and Pump applications. Adjustment of these parameter values may be necessary for your application.
Table 8-4 Parameter P-08 Control of Digital Inputs when P-07=5 or 6
P-08 Digital In 1 (Term. 2) Digital In 2 (Term. 3) Digital In 3 (Term. 4) Analog In 1 (Term. 6)
0, 2, 4-5,
8-12
Open Stop Open PI Control
Analog In 2 (PI feedback) No Effect
Closed Run Closed Preset Speed 1
1
Open Stop Open PI Control
Analog In 2 (PI Feedback) Analog Input 1
Closed Run Closed Analog Input 1
3, 6, 7*
Open Stop Open PI Control Open Trip (Ext Trip)
Analog In 1
(PI Feedback)
Closed Run Closed Preset Speed 1 Closed Run
9*
Open Stop Open PI Control
Analog In 2
(PI Feedback)
Analog In 1
(PI Feedback)
Closed Run Closed Preset Speed 1
*Table 8-4
P-08 = 3, 6 or 7 Note: Connect external PTC Motor Thermistor or similar user contact to Digital Input 3.
P-08 = 9 Note: Analog ln1 or 2 selected on highest value. There will be a 5% selection bandwidth to stop continual
switching when analog inputs are approximately equal.
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