Hitachi WJ200-001S Instruction Manual page 274

Zero Hz Speed Detection Signal
The inverter outputs the 0Hz speed detection signal when the inverter output
frequency falls below the threshold level ().
To use this function, assign
Option Terminal
Code Symbol

ZS Zero Hz speed
detection signal
11, 12, AL0 – AL2
Valid for inputs:

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.
" (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


page 3-89):
ZS
11
RY
page 4-51 and 3-91):
ZS
AL2
Load