Hitachi SJ Series, User Manual

Page: 351 / 786

12-16-2
Chapter 12 Inverter Function
12.16.2 Detecting output phase loss
• How to prevent system failure due to unstable
motor operation because a phase loss occurs by
breakage of the output cable to the motor
• Enable the output phase loss protection function
by using [bb-66] Output phase loss protection
selection.
• When the output phase loss protection function
has been enabled, an output phase loss error
[E034] will occur if a phase loss caused by
disconnection or breakage of the motor cable
continues.
Parameter
*1) The following restriction is applied:
For LD rated capacity, 12.0 kHz at maximum
For VLD rated capacity, 10.0 kHz at maximum
• If the capacity of the drive motor is smaller than
that of the inverter, the inverter may detect an
output phase loss erroneously. In this case,
decrease the value of [bb-67] or set [bb-66] to 00.
• If the carrier frequency [bb101] is low, the inverter
may detect an output phase loss erroneously. It
may improve by increasing the value of the carrier
frequency [bb101].
• This function operates when the output speed is
between 5 Hz and 100 Hz.
• Set the value of [bb-67] equal to or lower than the
steadily flowing current, with the rated current
being 100%.
Item Parameter Data Description
Output phase loss
protection selection
[bb-66]
00 Disabled
01 Enabled
Output phase loss
detection sensitivity
[bb-67] 1 ~ 100(%)
Adjusts the sensitivity of the output
phase loss
Carrier frequency [bb101] 0.5~16.0(kHz) *1) Changes the carrier frequency
Q
Ａ
！