32
33
Protective functions
Protective functions
Description of trip can be displayed only when the Digital key pad (option) or PC is con-
nected. Protection function works even when the Digital key pad or PC is not connected,
but it is not displayed.
Trip
number
Protective
item
Description
Measure
Display on
Digital key pad
1
Sensor error *
The brushless amplifier trips
when trouble of CS sensor
signal is detected.
It may be a malfunction
due to external noise.
E-CS
—
Under voltage
warning
(default)
When the internal DC voltage is
below specified value, operation
is stopped; when voltage is
recovered, operation is started
again. (This is not trip, and no
trip output is made.)
• Trip can be set by parameter
50 to YES.
Product of 100 V: Approx DC100 V,
Product of 200 V: Approx DC200 V
Investigate the condition of
wiring and circumstances
of power supply.
L
2
Undervoltage
error
• The brushless amplifier trips
when internal DC voltage is
below specified value only if
trip is set by parameter 50 to
YES.
100 V product: Approx DC100 V,
200 V product: Approx DC200 V
E-LV
3
Overvoltage
error
The brushless amplifier trips
when internal DC voltage
(voltage of power supply
smoothing capacitor) rises and
exceeds specified value.
Product of 100 V: Approx DC200 V,
Product of 200 V: Approx DC400 V
If the motor should trip in
running, too short decel-
eration time is one of the
causes. Adjust deceleration
time.
E-OV
—
Overload
warning
(Electronic
thermal)
When the load factor reaches
100% overload warning level,
the monitor display flashes.
Lower the load factor
below 100% by reducing
load, changing operation
pattern or increasing motor
capacity.
5-digit
LED
flashes.
4
Overload error
(Electronic
thermal relay)
The brushless amplifier trips
when motor torque is output
continuously above 115%.
THr
5
Overspeed
error
The brushless amplifier trips
when rotation speed (actual
speed) exceeds specified value.
Approx 6000 r/min
Check for overshooting due
to too short acceleration
time.
E-OS
Trip
number
Protective
item
Description
Measure
Display on
Digital key pad
8
Overcurrent *
error
The brushless amplifier trips
when the motor current exceeds
specified current.
It may have been caused
by excessive acceleration/
deceleration setting or gain
setting.
Set the longer acceleration/
deceleration time and the
smaller gain.
If this trip should occur as
soon as the unit is started,
It may be breakdown.
E-OC
9
Overheat
error
The brushless amplifier trips
when the temperature in control
section rises above specified
value.
Approx. 105 °C
Check the ambient tem-
perature and cooling condi-
tion of brushless amplifier.
Check the load factor and
operation pattern.
E-OH
10
External
forced trip
The brushless amplifier trips
when external forced trip input
becomes active.
If an external thermal
element is used, check the
cause of temperature rise.
E-OL
11
Setting change
warning
The brushless amplifier trips
when any important parameter
such as “ 30 Run command
selection” is changed.
This is not abnormal.
Reset trip in order to make
change effective.
CAU
30
Parameter
initialization
display
Select
in “ 54 Parameter
initializing”. Turn off power and
then on to trip.
This is not abnormal.
The parameter was
initialized.
It is clearable only by
power supply re-injection.
- - - -
90
91
Parameter *
error
Parameter data saved in
EEPROM is abnormal.
E-UPr: recheck and reset
all parameters.
E-SPr: internal parameter
error.
It may be breakdown.
E-UPr
E-SPr
Other
number CPU error *
The brushless amplifier
trips when trouble of control
microcomputer is detected.
It may have been caused
by malfunction due to
external noise.
Investigate for noise source.
Err
* To cancel the trip when the protection function with * is activated, please perform the
method of (1) on page 34.
1000
100
10
100
110
120
130
140
150
Overload protection
time characteristics
Torque (%)
Time (s)
