Zero Hz Speed Detection Signal - Hitachi WJ200 Series Instruction Manual

Zero Hz Speed Detection Signal

The inverter outputs the 0Hz speed detection signal when the inverter output
frequency falls below the threshold level (C063).
To use this function, assign
Option Terminal
Code Symbol
ZS Zero Hz speed
21
detection signal
11, 12, AL0 – AL2
Valid for inputs:
C063
Required settings
Notes:
• The example circuit for terminal [11] drives a relay
coil. Note the use of a diode to prevent the
negative-going turn-off spike generated by the coil
from damaging the inverter's output transistor.
"21 (ZS)" to one of the intelligent output terminals.
Function Name State
ON
OFF
Description
Output frequency is less than
Output frequency is not less than
Example for terminal [11] (default output
configuration shown – see
Inverter output
terminal circuit
CM2
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration – see
Inverter logic
circuit board
AL0 AL1
Power
supply
See I/O specs on page 4-6
4−67
C063
C063
page 3-90):
ZS
11
RY
page 4-52 and 3-90):
ZS
AL2
Load