Hitachi WJ200-001L, Instruction Manual, Page: 274 / 680

4

67
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 “

(ZS)” to one of the intelligent output terminals.
Option
Code
Terminal
Symbol
Function Name State Description

ZS Zero Hz speed
detection signal ON
Output frequency is less than

OFF
Output frequency is not less than

Valid for inputs: 11, 12, AL0
– AL2
Example for terminal [11] (default output
configuration shown
– see
page 3-89 ):
Example for terminal [AL0], [AL1], [AL2] (requires
output configuration
– see
page 4-51 and 3-91 ):
See I/O specs on
page 4-6
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.
RY
Inverter output
terminal circuit
CM2 11
ZS
AL1
Power
supply
Load
AL0 AL2
Inverter logic
circuit board ZS