Standby Electricity Saving (Suspend Function) - Daikin FTXM-V Series Service Manual

SiUS042113E
PI Control
1. P control
2. I control
3. Frequency control when other controls are functioning
4. Upper and lower limit of frequency by PI control
3.3

Standby Electricity Saving (Suspend Function)

Outline This function is to save standby electricity consumption while the air conditioner is not in operation
by partially separating the electrical circuit of indoor and outdoor units from the power source.
Details
 Standby electricity saving function can be activated/deactivated from the service mode of the
 When standby electricity saving is ON, the system enters suspend state if both indoor and
 The system will not go into suspend state when some voltage is applied to the outdoor unit for
 In suspend state, power supply to the outdoor unit is halted and there is no communication
 To return from the suspend state, start fan or other operation to turn on the indoor unit.
Part 4 Functions and Control
The D value is calculated in each sampling time (20 seconds), and the frequency is adjusted
according to its difference from the frequency previously calculated.
If the operating frequency does not change for more than a certain fixed time, the frequency is
adjusted according to the D value.
When D value is low, the frequency is lowered.
When D value is high, the frequency is increased.
 When frequency is dropping:
Frequency control is carried out only when the frequency drops.
 For limiting lower limit:
Frequency control is carried out only when the frequency rises.
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor or outdoor unit quiet operation command comes from the indoor unit, the upper
limit frequency is lower than the usual setting.
remote controller. Refer to page 155 for details.
outdoor units are not in operation.
protection purpose even if the indoor unit is not in operation.
between the indoor unit and the outdoor unit.
Also the service monitor LED (LED A) lights off.
Control Specification
63