2 Control Functions
Control of the cooling cycle
SMGB0120 rev.0 - 11/2017
39
2
Image diagram of 0 (zero) point adjustment
Thermo OFF
Thermo ON
Expansion valve opening
Forced 0 (zero) point adjustment
is performed
Time
In superheat control
If the compressor does not stop in 200 hours
Restart after 3 minutes
If more than 24 hours have passed since the last 0 (zero) point
adjustment, then 0 (zero) point adjustment is performed during
Thermo OFF.
2.2.3 Overcurrent protection control
There is a function to force unload in case that the upper limit of running current of the unit is about to be exceeded. It is
possible to change the setting value of overcurrent protection control from the "Service" menu.
Activation of overcurrent protection
When the running current of the unit reaches the upper limit of running current, the power source capacity load is abated
by means of forced unload operation. (See figure below).
Load down control is continued until reaching 98% of setting value for current limit. Load up control is restricted too
between 95% and 100% of setting value for current limit.
It is also possible to change the setting value for current limit from the settings in "Service".
Setting
value
Setting value x 0.98
Setting value x 0.97
Setting value x 0.95
Cancel
Current value
Load up
limitation
Load up
limitation
Compressor
current value
Forced
unload
Activation of over current protection control
