Hitachi WJ200 Series Software, Инструкция по эксплуатации

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Electronic Thermal Overload Alarm Setting
The thermal overload detection protects the inverter and motor from overheating due to
an excessive load. It uses a current/inverse time curve to determine the trip point.
First, use
B013
to select the torque characteristic that matches your load. This allows
the inverter to utilize the best thermal overload characteristic for your application.
The torque developed in a motor is directly proportional to the current in the windings,
which is also related to the heat generated (and temperature, over time).
Therefore, you must set the thermal overload threshold in terms of current (amperes)
for parameter
B012
. The range is 20% to 100% of the rated current for each inverter
model. If the current exceeds the level you specify, the inverter will trip and log an event
(error
E 05
) in the history table. The inverter turns the motor output OFF when tripped.
Separate settings are available for the second motor (if applicable) as shown in the
following table.
“b” Function Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
B012
Level of electronic thermal Set a level between 20% and 100%
for the rated inverter current.
U
Rated
current for
each
inverter
model *1
A
B212
Level of electronic thermal,
2 nd motor
U
A
B013
Electronic thermal
characteristic
Select from three curves, option
codes:
00
… Reduced torque
01
… Constant torque
02
… Free setting
U
01 −
B213
Electronic thermal
characteristic, 2
nd
motor
U
01 −
b015
Free setting electronic
thermal ~freq.1
Range is 0 to 400Hz
U
0.0 Hz
b016
Free setting electronic
thermal ~current1
Range is 0 to inverter rated current
Amps
U
0.00 Amps
b017
Free setting electronic
thermal ~freq.2
Range is 0 to 400Hz
U
0.0 Hz
b018
Free setting electronic
thermal ~current2
Range is 0 to inverter rated current
Amps
U
0.00 Amps
b019
Free setting electronic
thermal ~freq.3
Range is 0 to 400Hz
U
0.0 Hz
b020
Free setting electronic
thermal ~current3
Range is 0 to inverter rated current
Amps
U
0.00 Amps
WARNING: When parameter
B012
, level of electronic thermal setting, is set to motor
FLA rating (Full Load Ampere nameplate rating), the inverter provides solid state
motor overload protection at 115% of motor FLA or equivalent. If parameter
B012
exceeds the motor FLA rating, the motor may overheat and be damaged. Parameter
B012
, level of electronic thermal setting, is a variable parameter.