E9 to E28 NKR Service Manual.pdf - Industrial Air
E9 to E28 NKR Service Manual.pdf - Industrial Air
E9 to E28 NKR Service Manual.pdf - Industrial Air
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14. Protection Control<br />
14.1 Protection Control For All Operations<br />
14.1.1 Restart Control (Time Delay Safety Control)<br />
The Compressor will not turn on within 3 minutes from the moment operation s<strong>to</strong>ps, although the unit is turned on<br />
again by pressing OFF/ON but<strong>to</strong>n at remote control within this period.<br />
This control is not applicable if the power supply is cut off and on again.<br />
This phenomenon is <strong>to</strong> balance the pressure inside the refrigerant cycle.<br />
14.1.2 Total Running Current<br />
When the outdoor unit <strong>to</strong>tal running current (AC) exceeds X value, the frequency instructed for compressor<br />
operation will be decreased.<br />
If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.<br />
However, if <strong>to</strong>tal outdoor unit running current exceeds Y value, compressor will be s<strong>to</strong>pped immediately for<br />
3 minutes.<br />
Model E7<strong>NKR</strong> <strong>E9</strong><strong>NKR</strong> E12<strong>NKR</strong> E15<strong>NKR</strong> E18<strong>NKR</strong> E21<strong>NKR</strong> E24<strong>NKR</strong> <strong>E28</strong><strong>NKR</strong><br />
A 3.95 4.29 6.57 9.07 10.07 11.80 12.48 12.48<br />
B 3.60 3.69 6.13 8.65 8.82 11.46 11.46 11.46<br />
Cooling / Soft Dry (X)<br />
C 3.60 3.69 6.13 8.05 8.05 10.49 10.12 10.12<br />
Heating (X) 4.46 5.94 7.30 9.82 11.03 11.63 13.54 13.54<br />
Y 15.00 15.00 15.00 15.00 15.00 15.00 19.00 19.00<br />
The first 30 minutes of cooling operation, (A) will be applied.<br />
14.1.3 IPM (Power transis<strong>to</strong>r) Prevention Control<br />
Overheating Prevention Control<br />
o When the IPM temperature rises <strong>to</strong> 120°C (E7 ~ 18NK) or 100°C (E21 ~ 24NK) or 120°C (<strong>E28</strong>NK),<br />
compressor operation will s<strong>to</strong>p immediately.<br />
o Compressor operation restarts after 3 minutes the temperature decreases <strong>to</strong> 110°C (E7 ~ 18NK) or 95°C<br />
(E21 ~ 24NK) or 110°C (<strong>E28</strong>NK).<br />
o If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).<br />
DC Peak Current Control<br />
o When electric current <strong>to</strong> IPM exceeds set value of 18.5 A (E7 ~ 15NK) and 30.0 ± 5.0A (E18 ~ 28NK), the<br />
compressor will s<strong>to</strong>p operate. Then, operation will restart after 3 minutes.<br />
o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will<br />
restart after 1 minute.<br />
o If the set value exceeded again within 30 seconds after the compressor starts, the operation will restart after<br />
1 minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off, timer<br />
LED will be blinking (“F99” is indicated).<br />
97
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