Running the Pump
311596A
19
Start/Stop Command
Local Control Mode
When Local mode is selected, Run command can only
be initiated by means of Run/Stop hardware switch – set
Run/Stop switch to Run position.
Stop command can be initiated by one of the following:
1.
Run/Stop switch:
Set Run/Stop switch to Stop position.
2.
Stop/Reset button:
Press Stop/Reset (red) button on a VFD Keypad
display. Note that if Stop command was initiated by
pressing Stop/Reset button, one of the following two
actions will restart the pump:
a.
Cycle the Run/Stop switch – Set it to Stop posi-
tion and then to ‘Run’ position.
b.
Cycle Secure Disable circuit.
3.
Secure Disable circuit:
Disable the drive by disconnecting SD circuit. Note
that if motor is stopped by means of SD circuit while
Run/Stop switch was in Run position, the Run com-
mand will be reapplied once SD circuit is recon-
nected.
Remote Control Mode
When remote control mode is selected (Local/Remote
switch is in Remote mode), Control Word is automati-
cally enabled (Pr 6.43 = 1) and Run/Stop commands are
controlled by the Control word (Pr 6.42). Commands can
be directly entered into the VFD by means of a Keypad
or can be sent via Modbus. Refer to SM Ethernet User
Guide (Control Techniques) for more information on
Modbus control.
Control word (Pr 6.42) commands:
Run command = 195
Stop command = 193
Refer to Unidrive SP User Guide for more information on
system sequencer.
Keypad Control
Run command can be varied via Keypad only if
Local/Remote switch is set to Remote.
To initiate Run command via Keypad, navigate to Pr
20.25 and set its value to 2.
Stop command can be initiated by one of the following:
1.
Stop/Reset button:
Press Stop/Reset (red) button on a VFD Keypad
display. If Stop command was initiated by pressing
Stop/Reset button, one of the following two actions
will restart the pump:
a.
Set Pr 20.25 to 1 and then to 2.
b.
Cycle SD circuit.
2.
Navigate to Pr 20.25 and set its value to 1.
Modbus Control
Run command can be varied via Keypad only if
Local/Remote switch is set to Remote.
VFD parameter Pr 6.42 can be varied via Modbus com-
munication protocol.
Run Command => Pr 6.42 = 195
Stop Command => Pr 6.42 = 193
Note that Hardware Enable circuit cannot be triggered
by software. It needs to be physically connected or dis-
connected.
One way to use Modbus is to open Ethernet module’s
webpage and get direct access to Pr 6.42.
Pr 20.25 is an image of Pr 6.42. Setting Pr 20.25 to
2 will cause Pr 6.42 to set to 195, and setting Pr
20.25 to 1 will cause Pr 6.42 to set to 193.
