Hitachi WJ200-001L, Instruction Manual

Page: 529 / 680

Ver.3
−
− −
−
20
②
When b910 = 02
When output current is less than thermal count level, subtracted constantly with fixed rate as max
value thermal counter (trip level) down to 0 within the time defined with thermal subtraction time
(b911).
Fig.2 Thermal Counter Subtraction Image when b910=02
Output Current
Thermal Count
Level
Thermal Counter
100[%]
(trip level
Trip
b911
Output Current
Thermal Counter
100%/b911
③
when b910 = 03
When output current is less than thermal count level, subtracted with the value equal to thermal
counter value multiplied with linear filter of time constant (b912) and target as 0. (when output
current keeps to be less than thermal count level, thermal counter becomes 0 within a time
approximately 5 times b912)
5 times of b912
b912
Subtraction rate
Calc. b912
Fig3. Thermal Counter Subtraction Image when b910=03
Output Current
Thermal Count
Level
Thermal Counter
100[%]
Trip level
Trip
Output Current
Thermal Counter