Current Limit Control; Actuation Of Current Limiter Actuation Of Current Limiter; Standard Setting Value Of Unload Time - Hitachi RCUE40AG2 Service Manual

Control System

4.4. Current limit control


Current limit setting


Current limit control

pag. 54
SMGB0003 rev.0-01/2007
Unit has a function to perform automatically forced unload when the power consumption
is over a certain set point.
4.4.1. Actuation of current limiter
When unit current detected by CT reaches to the setting value, forced unload
operation is performed for some minutes to reduce the power capacity load. (See
the fi gure below)
Load is down until actual current value is 95% of setting value, and then load
down signal is output for 12 seconds to keep the load.
Current value and forced unload operation time are set on PCBa (current limit
setting).
Set value
Set value
-5%

4.4.2. Standard setting value of unload time

Current standard setting value of each model is shown in the below fi gure:
−
First
Units
decimal
digit
place
X
1
,
RSW5
RSW6
Adjust the calculated
setting value
Ejemplo RCUE80AG2
6
1
,
X
RSW5
RSW6
Actuation
Unit current
T min/hour (standard: 30 m)
Forced unload
Segment indication Segment indication
Cooling : [←→]
Heating : [←→] Heating : [
Decide the period to continue forced load
down (setting value x 10 min)
Y
X
RSW7
40A 40 HP
50 HP
X
60 HP
50A 70 HP
80 HP
Ejemplo RCUE40AG2
1
50 = 80 A
RSW6
Release the actuation
10 min.
2
,
X
40 =
RSW5
Time
48 A