Troubleshooting  Electrical controllers

SC Series

1LED display does not light up.
2No output even if the overcurrent setting is set to the MIN value.
3Output relay operates immediately after start-up.
4Momentary overload during operation activates the output relay.
5Output relay does not operate when overloaded.

SB Series 、ED Series

6MON (monitor lamp) does not light up. ---SB Series
LED display does not light up. ---ED Series
7No output even if the current setting volume is minimized.
8Output relay operates immediately after start-up.
9Momentary overload during operation activates the output relay.
10Output relay does not operate when overloaded.

150 Series

11Power indicator does not light up.
12% Display meter does not move during operation.
13Output relay operates immediately after start-up.
14Motor starts but % display meter reading is different for actual current.
15Momentary overload during operation activates the output relay.
16Output relay does not operate when overloaded.

50 Series

17Input indicator does not light up after motor start-up.
18Output relay operates immediately after start-up.
19Momentary overload during operation activates the output relay.
20Output relay does not operate when overloaded.
Answers

SC Series

1LED display does not light up.
Inspection items 1 Wiring of A1 and A2 Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Is the voltage of A1 and A2 between 100 and 240V? Inspection result Different between 100-240V Solution Set between 100 and 240V
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2No output even if the overcurrent setting is set to the MIN value.
Inspection items 1 Wiring to current transformer (CT) Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Shock Relay model number Inspection result Wrong model number Solution Replace with correct one
Inspection items 3 TEST function Inspection result Output relay does not operate Solution Replace Shock Relay
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3Output relay operates immediately after start-up.
Inspection items 1 Start time setting Inspection result Setting is too short Solution Adjust to proper value
Inspection items 2 Load current setting Inspection result Setting is too low Solution Adjust to proper value
Inspection items 3 Parameter setting Inspection result Phase reversal, open phase and phase unbalance are set to ON Solution Check for wiring that is phase reversal or open phase
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4Momentary overload during operation activates the output relay.
Inspection items 1 Load current setting Inspection result Setting is too low Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too short Solution Adjust to proper value
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5Output relay does not operate when overloaded.
Inspection items 1 Load current setting Inspection result Setting is too high Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too long Solution Adjust to proper value
Inspection items 3 TEST function Inspection result Output relay does not operate Solution Replace Shock Relay
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SB Series 、ED Series

6MON (monitor lamp) does not light up. ---SB Series
LED display does not light up. ---ED Series
Inspection items 1 Wiring of A1 and A2 Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Is the voltage of A1 and A2 between 24 and 240VAC/DC? Inspection result Different between 24-240V Solution Set between 24 and 240V
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7No output even if the current setting volume is minimized.
Inspection items 1 Wiring to current transformer (CT) Inspection result Not wired correctly. Solution Wire correctly
Inspection items 2 Shock Relay model number Inspection result Wrong model number Solution Replace with correct one
Inspection items 3 Press TEST button Inspection result Output relay does not operate Solution Replace Shock Relay
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8Output relay operates immediately after start-up.
Inspection items 1 Start time setting Inspection result Setting is too short Solution Adjust to proper value
Inspection items 2 Load current setting Inspection result Setting is too low Solution Adjust to proper value
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9Momentary overload during operation activates the output relay.
Inspection items 1 Load current setting Inspection result Setting is too low Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too short Solution Adjust to proper value
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10Output relay does not operate when overloaded.
Inspection items 1 Load current setting Inspection result Setting is too high Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too long Solution Adjust to proper value
Inspection items 3 Press TEST button Inspection result Output relay does not operate Solution Replace Shock Relay
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150 Series

11Power indicator does not light up.
Inspection items 1 Wiring of POWER terminal Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Voltage at POWER terminal (between terminals 100/110 V)
For the above operating power supply
Inspection result Different from AC100/110V Solution Set to AC100/110V
Inspection items 3 Voltage at POWER terminal (between terminals 200/220 V)
For the above operating power supply
Inspection result Different from AC200/220V Solution Set to AC200/220V
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12% Display meter does not move during operation.
Inspection items 1 Wiring of current transformer Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Current transformer model number Inspection result Wrong model number Solution Replace with correct one
Inspection items 3 Press TEST button Inspection result % Display meter does not move Solution Replace Shock Relay
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13Output relay operates immediately after start-up.
Inspection items 1 Start time setting Inspection result Setting is too short Solution Adjust to proper value
Inspection items 2 Current setting Inspection result Setting is too low Solution Adjust to proper value
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14Motor starts but % display meter reading is different for actual current.
Inspection items 1 Common current transformer Inspection result Not wired correctly to terminals Solution Wire correctly
Inspection items 2 Through-type current transformer Inspection result Wrong number of passing through Solution Make correct number of passing through
Inspection items 3 Current transformer model number Inspection result Wrong model number Solution Replace with correct one
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15Momentary overload during operation activates the output relay.
Inspection items 1 Load current setting Inspection result Setting is too low Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too short Solution Adjust to proper value
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16Output relay does not operate when overloaded.
Inspection items 1 Load current setting Inspection result Setting is too high Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too long Solution Adjust to proper value
Inspection items 3 Press TEST button Inspection result Output relay does not operate Solution Replace Shock Relay
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50 Series

17Input indicator does not light up after motor start-up.
Inspection items 1 Wiring of POWER terminal Inspection result Not wired correctly Solution Wire correctly
Inspection items 2 Voltage at POWER terminal (between terminals 100/110 V)
For the above operating power supply
Inspection result Different from AC100/110V Solution Set to AC100/110V
Inspection items 3 Voltage at POWER terminal (between terminals 200/220 V)
For the above operating power supply
Inspection result Different from AC200/220V Solution Set to AC200/220V
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18Output relay operates immediately after start-up.
Inspection items 1 Load current setting Inspection result Setting is too low Solution Adjust to proper value
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19Momentary overload during operation activates the output relay.
Inspection items 1 Load current setting Inspection result Setting is too low Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too short Solution Adjust to proper value
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20Output relay does not operate when overloaded.
Inspection items 1 Load current setting Inspection result Setting is too high Solution Adjust to proper value
Inspection items 2 Shock time setting Inspection result Setting is too long Solution Adjust to proper value
Inspection items 3 Current transformer model number Inspection result Wrong model number Solution Replace with correct one
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※If the results of the above inspection show that there are no problems, or if Shock Relay needs to be replaced according to the solution, please contact us.