8-1
Chapter 8 PROTECTIVE FUNCTIONS
If any inverter protective function is activated to issue an alarm, the inverter displays the
corresponding alarm code on the LED monitor of the keypad and shuts down its output.
Accordingly, the motor coasts to a stop.
Table 8.1 lists alarm codes related to the PG interface card. For other alarm codes, refer to the
FRENIC-Multi Instruction Manual (INR-SI47-1094-E), Chapter 6 "TROUBLESHOOTING."
Table 8.1 Related Alarm Codes
Alarm for:
Alarm
code
Alarm name
Frequency
control
with pulse
rate input
Speed
control
Positioning
control
Refer to
Section:
os
Overspeed alarm NA Y NA 8.1
ere
Excessive speed deviation alarm NA C NA 8.2
ero
Positioning control alarm NA NA Y and C 8.3
Y: Always active. The protective function for the alarm is always active when the control is enabled.
C: Conditionally active. The protective function for the alarm is active when the control is enabled
and the protective function is enabled with the function code. The factory default is "enabled."
NA: Not available when the control is enabled.
If any of the protective functions has been activated, first remove the cause. Then, after
checking that the all run commands are set to off, reset the alarm. Note that if the alarm is
reset when any run command is set to on, the inverter may supply the power to the motor
which may cause the motor to rotate.
Injury may occur.
8.1 Overspeed Alarm (
os
)
Table 8.2 Overspeed Alarm Specifications
Alarm code Descriptions
os
• The inverter issues this alarm when the detected speed exceeds the 1.2 times the
minimum value of either (1) or (2) below.
(1)
For the selected motor,
Maximum frequency (F03 or A01) + Torque limiter (Frequency increment limit for
braking, H76)
(2) Frequency limiter, High (F15)
• This protective function works when the inverter is outputting with the speed control
with PG being enabled (F42 or A14 = 3 or 4 and PG/Hz is ON).
8.2 Excessive Speed Deviation Alarm (
ere
)
Table 8.3 Excessive Speed Deviation Alarm Specifications
Alarm code Descriptions
ere
• This protective function recognizes a PG error by software based on the relationship
between the speed command and the detected speed.
• When the speed deviation between the speed command and the detected speed
has exceeded the excessive speed deviation level specified by o17 during the period
longer than the timer setting specified by o18, the protective function issues this
alarm.
•
This protective function provides two choices--"Stop running" (o19 = 1 or 2) and
"Continue to run" (o19 = 0) when it is activated. When the latter is selected, the
inverter continues to run with output to terminal [Y] without issuing an alarm.
• This protective function works when the inverter is outputting with the speed control
with PG being enabled (F42 or A14 = 3 or 4 and PG/Hz is ON). It does not, however,
during DC braking or idling due to overload.
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