SDV-DM7 AC200/220 Omron, SDV-DM7 AC200/220 Datasheet - Page 36

• Manufacturer Part Number: SDV-DM7 AC200/220
• Description: Sensor Hardware & Accessories VOLTAGE SENSOR
• Manufacturer: Omron

Specifications of SDV-DM7 AC200/220

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Troubleshooting
An SE-series relay cannot be used with a circuit containing thyristors,
rectifiers, or VVVF inverters, because these elements can change
the output waveform to the point that the relay will malfunction. The
diagram below shows the basic operation of an SET Current Con-
verter.The input current is converted to a DC current suitable for the
SE-series relay by 3-phase full wave rectification and the resistors.
34
Checklist After Connection and Before Starting Motor
Relay operates before the motor starting time has
elapsed. (OPEN indicator)
Relay operates after the motor starting time has
elapsed. (OC indicator)
Motor circuit is not tripped when the relay operates
following the depression of the test button.
Relay doesn’t operate properly under light loads.
Check the Current Converter for the proper number of
conductor runs through holes and the proper direction.
Check the Current Converter and Motor Protective Relay
for connection with proper polarity.
Check the phase-sequence of 3-phase voltage (for 3E
relays).
Checking Operation
Thyristors, Rectifiers, or VVVF
Inverters
Motor Protective Relay
Trouble
SE
1. Is there any open-phase trouble in the motor or its circuit (fuses, electromagnetic con-
2. Does the Current Converter have the correct number of conductor runs through holes?
3. Is the supply voltage or motor current unbalanced (unbalanced factor of more than
1. Does the set current match the motor current?
2. Does the set operating time match the motor starting time?
3. Does the Current Converter have the correct number of conductor runs through the
1. Disconnect terminals 4, 5, and 6, (Ta, Tb and Tc with the flush mount type) and check
1. Check each phase for an imbalance of more than 35%, and also check for waveform
2. If the open-phase unbalance sensitivity switch is set to “H”, then switch it to “L”.
3. If the switch is already set to “L”, then the open-phase ON/OFF switch can be set to
tactors, wiring)?
Does the conductor run in the proper direction?
35%)?
holes?
the relay contacts for electrical continuity.
distortion.
OFF, but the open-phase function will be disabled.
Test Operation
Corrective action
Press the test button (for
longer than the set time).
Does the relay
operate?
The output voltage is composed of a normal three-phase component
and open-phase or imbalance components, so it is made up of both
DC and AC components.
NORMAL
YES
M
Check Points
CT
Apply control
power supply
to the relay
NO
20
Relay operates instantaneously
40
80
Check for:
1. Loose terminal screw
2. Faulty reset of trip
3. Low voltage at power
Change the phase-
sequence of 3-phase
voltage properly.
indicator
supply
SET-3
(+)
( )
(7)
(8)
SE