Elektronika SCM60ZD-S Manual page 42

(n) Current safe control
(i) When converter in port current is detected at the current sensor (CT) and it exceeds the set amperage, the decision speed is
reduced. This is rechecked after one second and if it still exceeds the set amperage, the decision speed is reduced 2 rps.
(ii) If the decision speed operated at 20 rps or less, the compressor is stopped. It is restarted after a 3 minute delay.
(o) Current cut
This detects converter output current at the shunt resistor and if it exceeds the set value, the compressor is stopped. It is
restarted after a 3 minute delay.
(p) Compressor overheat protection
The detection temperature of the discharge pipe sensor (Tho-D) is used to prevent oil deterioration and damage to the motor
wire due to overheating of the compressor.
(i) If Tho-D becomes > = 110 °C, the compressor is stopped. After the stop mode has been activated, the compressor will be
restarted when Tho-D becomes < 80 °C. However, if it is restarted repeatedly within an interval of 1 hour, it will not start
on the 3 times.
(ii) When 90 °C < = Tho-D < 110 °C, the following decision speed controls are performed.
Decision speed
Inverter
Notes (1) If the temperature of the discharge pipe is 90 °C or more and less than 110 °C, the decision speed is reduced by 4 rps.
(2) After 20 seconds, if the temperature of the discharge pipe has decreased, it is lowered 2 rps. If the temperature has risen or is the
(3) If the temperature of the discharge pipe is 80 °C or more and less than 90 °C, the decision speed is maintained. If operation is
(q) Serial transmission abnormality protection
If the compressor is operating with a decision speed other than 0 rps and a serial signal cannot be received from all indoor
controls with outdoor controls having serial signals other than "stop - 0 rps" continuously for 1 minute and 55 seconds, the
compressor is stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a serial signal can be received
again from the indoor control.
(r) Compressor lock
If the motor for the compressor does not turn 1/12 revolution 0.044 seconds after it has been started, it is determined that a
compressor lock has occurred and the compressor is stopped.
(s) Discharge pipe sensor disconnection protection control
(i) When the decision speed is other than 0 rps.
1) Th -D(10)-Th
O
The decision speed is set on 10 rps for 5 minutes. After 5 minutes, the decision speed is set on 40 rps for 5 minutes.
2) Th -D(20)-Th
O
The decision speed is set on 0 rps.
(ii) Once the unit is stopped by this function, it is not restarted.
Notes (1) Tho-D(X): After compressor operation, the discharge pipe sensor temperature after X minutes.
(2) Tho-A(X): After compressor operation, the outdoor air sensor temperature after X minutes.
42
6 minutes of more has passed
6 minutes of more has passed
6 minutes of more has passed
80
Discharge pipe temperature (°C)
same, it is lowered another 4 rps.
maintained at the same speed for 6 minutes or more or if the temperature is 80 °C or less, control is returned to normal operation.
-D(0) < 8 °C, and Th -D(10)-Th
O O
-D(15) < 5 °C :
O
(3) 4 rps
(3)
(3)
Lower limit 20 rps
90
-A(10) < 5°C
O
(2)
4 rps or 2 rps
(2)
4 rps or 2 rps
0 rps
110