Controls and Indicators
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311596A
Controls and Indicators
Control Modes
There are two ways to control or monitor the E-Flo Plus
Electric Circulation Pump.
•
Locally
•
Remotely (Keypad/Modbus)
The addition of a local control box (kit 120373) allows
the operator to control the E-Flo Plus at the unit. See
Available Options on page 5.
Starting, running, and stopping of the motor is controlled
by the Sequencer, which has been programmed to com-
ply with E-Flo Plus Local and Remote schemes. VFDs
are normally installed in electrical enclosures, away
from motors, which they control. Local mode refers to
controls which are installed locally at the pump, or within
sight of the pump. Remote mode refers to controls
installed remotely, away from the pump.
Mode selection is performed by a hardware switch. Digi-
tal I/O #5 (Pin #28) is configured for this operation (see
System Electrical Diagrams, page 36). Normally open
position of the switch commands remote mode; closed
position commands local mode.
If Local mode of operation is an option for a given instal-
lation, use Graco Local I/O Explosion Proof Control Box
(Graco P/N: 120373).
More then one command is required to be active for
motor to operate. All of these are controlled by Graco
software. Do not try to reconfigure VFD parameters to
operate outside of the Graco design described in this
manual. Doing so can cause system malfunction.
Parameters are controlled by the program in the
AppsLite module and will be reset back to E-Flo Plus
defaults at next reset. Reset occurs during each
power-up.
Run command refers to a set of commands, enabling
motor to run in designated direction.
Stop command refers to a set of commands, authorizing
motor to stop running.
Local Control Mode
When Local mode is selected, motor can only be started
by a hardware switch. Pin #27 is configured for this
operation (see System Electrical Diagrams, page 36).
Normally open position is Stop; closed position is Run.
Stop Command Via Keypad
To initiate the Stop command via the keypad, press the
Stop/Reset (red) button on a keypad display.
Remote Control Mode
When remote control mode is selected, control com-
mands can be directly entered into the VFD by means of
a keypad or can be sent via modbus. Refer to SM Ether-
net User Guide (Control Techniques) for more informa-
tion on modbus control.
Two Variable Frequency Drives are available and are
used for different voltages. Use the appropriate one for
your system. See front cover for part number informa-
tion.
Common ground is available at VFD pins #1, 3, 11,
21, 23, and 30.
Common ground is available at VFD pins #1, 3, 11,
21, 23, and 30.
