Using the Up/Down Function with Frequency Reference Limits
The upper frequency reference limit is determined by parameter d2-01.
The value for the lower frequency reference limit can be set by an analog input or parameter d2-02. When a Run command
is applied, the lower limits work as follows:
• If the lower limit is set by parameter d2-02 only, the drive will accelerate to this limit as soon as a Run command is
entered.
• If the lower limit is determined by an analog input only, the drive will accelerate to the limit as long as the Run command
and an Up or Down command are active. It will not start running if only the Run command is on.
• If the lower limit is set by both an analog input and d2-02, and the analog limit is higher than the d2-02 value, the drive
will accelerate to the d2-02 value when a Run command is input. Once the d2-02 value is reached, it will continue
acceleration to the analog limit only if an Up or Down command is set.
Figure 5.17
shows an Up/Down function example with a lower frequency reference limit set by d2-02 and the frequency
reference hold function enabled/disabled.
Accelerates to
lower limit
Output frequency
upper limit
Lower limit
FWD run/stop
Up command
Down command
Power supply
Same
frequency
d4-01 = 1
d4-01 = 0
ON
ON
ON
ON
ON
Frequency
reference
reset
Figure 5.17 Up/Down Command Operation
Setting 14: Fault Reset
Whenever the drive detects a fault condition, the fault output contact will close and the drive’s output will shut off. The
motor then coasts to stop (specific stopping methods can be selected for some faults such as L1-04 for motor overheat).
Once the Run command is removed, the fault can be cleared by either the RESET key on the digital operator or by closing
a digital input configured as a Fault Reset (H1-
= 14).
Note:
Fault Reset commands are ignored as long as the Run command is present. To reset a fault, first remove the Run command.
Setting 15/17: Fast-stop (N.O./N.C.)
The Fast-stop function operates much like an emergency stop input to the drive. If a Fast-stop command is input while the
drive is running, the drive will decelerate to a stop by the deceleration time set to C1-09 (
Refer to C1-09: Fast-stop
Time on page 77
). The drive can only be restarted after is has come to a complete stop, the Fast-stop input is off, and the
Run command has been switched off.
• To trigger the Fast-stop function with a N.O. switch, set H1-
= 15
• To trigger the Fast-stop function with a N.C. switch, set H1-
= 17
Figure 5.18
shows an operation example of Fast-stop.
Run/Stop
TIME
Fast-Stop
H1- = 17
Decelerates at C1-09
ON
ON
ON
ON
Output Frequency
Figure 5.18 Fast-stop Sequence
5.6 H: Terminal Functions
SIEP C710606 33A OYMC AC Drive – J1000 User Manual
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Parameter Details
