Optidrive Eco Advanced User Guide Revision 1.00
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4.5.
Output Current Limit
4.5.1.
Overload Operation
Optidrive Eco provides the following
110% Output current / 60 Seconds Maximum
150% Output current / 0.98 Seconds Maximum
At low output frequency levels, overload accumulation is faster, to account for the reduced motor cooling effect of the fan.
4.5.2.
Overview
Optidrive Eco 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 P1-08. An internal accumulator register is used to
estimate the point at which damage may occur to the motor, and operates as follows
Motor Current < P1-08
The accumulator value reduces towards zero. The time required depends on the actual load current as explained further below.
Motor Current = 100% P1-08
The accumulator value remains static.
Motor Current > 100% P1-08 < 110% P1-08
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 > 110% P1-08
For high current levels, the accumulator operates 16 times faster than for current levels below 110% of P1-08.
4.5.3.
Overload Curve
4.6.
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.
100%
110%
120%
130%
140%
150%
160%
0.10
1.00
10.00
100.00
1000.00
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Time to trip (s)
Drive Rated Supply
Voltage
DC Bus Voltage Level (Volts DC)
Under Voltage Trip
Minimum Operating
Over Voltage Trip
200 – 240 Volts AC
160
239
418
380 – 480 Volts AC
320
474
835
480 – 525 Volts AC
360
540
930
500 – 600 Volts AC
400
598
1020
