Digital Inputs
31
•
Local Control
This input function allows exclusive control of all drive logic functions from the
terminal block. If it is closed, the terminal block has exclusive control (disabling
all the DPI devices) of drive logic, including start, reference selection,
acceleration rate selection, etc. The exception is the stop condition, which can
always be asserted from any connected control device.
The drive must be stopped and other devices must not own exclusive control in
order for the terminal block to gain complete local control.
•
Clear Faults
The “Clear Faults” digital input function allows an external device to reset drive
faults through the terminal block. An open to closed transition on this input will
cause an active fault (if any) to be reset.
If this input is configured at the same time as “Stop - Clear Faults”, then only
the “Clear Faults” input can cause faults to be reset.
•
Enable
Closing this input allows the drive to run when a Start command is issued.
If the drive is already running when this input is opened, the drive will coast and
indicate “not enabled” on the HIM (if present). This is not considered a fault
condition, and no fault will be generated.
If this function is not configured, the drive is considered enabled. If multiple
“Enable” inputs are configured, then the drive will not run if any of the inputs
are open.
Any of the digital inputs can be configured as “Enable.” However, Digital Input
6 can be configured as a “Dedicated Hardware Enable” by removing a jumper.
In this case the parameter setting for [Digital In6 Sel] has no effect. This
hardware configuration bypasses software processing of the enable function and
provides hardware protection against a drive run condition. Refer to the User
Manual for jumper locations.
•
Exclusive Link
This function is used for exclusively controlling a digital output by activating a
digital input. It is used when no other functionality s desired for the input. See
Digital Outputs
.
The state of any digital input can be “passed through” to a digital output by
setting the value of a digital output configuration parameter ([Digital Out
x
Sel])
to “Input
n
Link”. The output will then be controlled by the state of the input,
even if the input is being used for a second function. If the input is configured as
“Not used” input function, the link to the input is considered non-functional.
•
Power Loss Level
When the DC bus level in the drive falls below a certain level, a “power loss”
condition is created in the drive logic. This function allows the user to select
between two different “power loss” detection levels.
If the input is closed, the drive will take its power loss level from [Power Loss
Level]. If the input is open, the drive will use a power loss level designated by
internal drive memory, typically 82% of nominal.
If the input function is not configured, then the drive always uses the internal
power loss level.
700VC
ONLY