Optidrive E3 Advanced Technical Manual Issue 05.Docx
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9
. G
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Tec
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l and P
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m
an
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ta
9.10.2
Overview
Optidrive E3 features both hardware and software protection of the output stage to prevent damage. In addition, an Ixt system is used to
monitor motor overload condition and prevent damage to the motor due to operation for prolonged periods at high load.
I x t protection is software based, using the value for motor rated current programmed in P-08. An internal accumulator register is used to
estimate the point at which damage may occur to the motor, and operates as follows
Motor Current < P-08
The accumulator value reduces towards zero. The time required depends on the actual load current as explained further below.
Motor Current = 100% P-08
The accumulator value remains static.
Motor Current > 100% P-08 < 150% P-08
The accumulator value increases at a rate proportional to the overload level, e.g. (Motor Current / Rated current) – 100%. If the overload limit
is reached, the drive will trip, displaying it.trp. to protect the motor.
Motor Current > 150% P-08
For high current levels, the accumulator operates 16 times faster than for current levels below 150% of P-08.
Peak over current trip levels are shown in the table below.
9.10.3
Example Operation
Maximum overload operation is 150% of motor rated current for 60 seconds. As this represents an overload of 50%, the accumulator trip level
is 3000. This means that if the drive operates with 125% load current, the time can be calculated as 3000 / (125 – 100) = 120 Seconds.
Above 150% load, accumulation is 16 times faster, hence for 160% load current, the time is 3000 / 16 / (160 – 150) = 18.75 seconds
9.10.4
Overload Curve
9.10.5
Additional Special Case Overload Operation
For ODE-3-240095-3F4
#
models, when output frequency <5Hz, overload accumulation is 2.5 times faster.
9.11
Under / Over Voltage Trip Levels
The following levels are not user adjustable, and define the operating voltage levels of the drive and brake chopper circuit.
Drive Rated
Supply Voltage
Drive Type
DC Bus Voltage Level (Volts DC)
Brake
Chopper
On
Brake
Chopper
Off
Under
Voltage
Trip
Minimum
Operating
(Inrush
Disabled)
Over
Voltage
Trip
110 – 115 Volts AC
Single Phase Output
195
189
80
113
208
110 – 115 Volts AC
Voltage Doubler
390
378
160
239
418
200 – 240 Volts AC
All
390
378
160
239
418
380 – 480 Volts AC
All
780
756
320
478
835
100
110
120
130
140
150
160
170
180
0
500
1000
1500
2000
2500
3000
Time
Time
Lo
ad
(
%
)
