OPERATION
Control Options
63
OPERATION
Control Options
Hand/Auto Controls
The drive can be operated in either
HAND
or
AUTO
mode as follows:
•
HAND
mode runs the motor based on
Hand Speed Ref [SET–09]
(frequency source) and
Hand
Run Cmd [SET–10]
(command source). Defaults for both settings are Keypad, which runs the
motor at a fixed speed (
Keypad Setpoint
) set on the Home Screen. Both settings can be
reprogrammed for external control. PID control is disabled in Hand mode.
•
AUTO
mode runs the motor based on
AUTO Speed Ref [SET–07]
(frequency source) and
AUTO Run
Cmd [SET–08]
(command source). The speed reference default is set per application. The
run command default is Keypad. Both settings can be reprogrammed as required.
There are several options to consider for operation of the VFD through external HOA controls:
HOA Mode Source [SET–60]:
This setting selects whether Hand/Auto control will come from
the Keypad, a Digital Input, or Communications. When switching modes with the keypad, the
VFD will stop, and will start when the
Start
key is pressed. When switching modes with a DI or
Comm source, the VFD will start based on the presence of a run command.
•
Keypad (Default):
The VFD Keypad HOA buttons, including
Start
and
Stop
, are fully func
-
tional.
•
Digital Input:
Enables HOA control through an external switch wired to two digital inputs
[MI1 to MI8]. These inputs should be set to
26_Hand
and
27_Auto
through parameters
[IO–21
to 28]
. HOA mode is then determined as follows:
•
RS485 Serial:
Enables HOA control through Modbus communications.
•
Com Card:
Enables HOA control through BACNet communications. The combinations of 0x2002 bit 3
and bit 4 are defined as follows:
Hand Speed Ref [SET–09]:
Source of Speed Reference in Hand mode. When in Hand mode, PID is disabled
and the VFD frequency is based on the following inputs:
•
Keypad (Default):
VFD runs at a fixed frequency set on the Home Screen.
•
RS485 Serial:
Frequency input through Modbus control.
•
AVI1 Analog:
Input from external controller, potentiometer, or other device.
•
ACI Analog:
Input from external controller, potentiometer, or other device.
•
AVI2 Analog:
Input from external controller, potentiometer, or other device.
•
COM Card:
Frequency input through communications protocol.
26_HOA Hand
27_HOA Auto
HOA Mode
Open
Open
OFF
Closed
Open
Hand
Open
Closed
Auto
Closed
Closed
OFF
Bit 3
Bit 4
HOA Mode
0
0
No change
1
0
Hand
0
1
Auto
1
1
OFF
Содержание Cerus X-Drive
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