Danfoss VLT MCD 600 Operating Manual page 128

VLT® Soft Starter MCD 600
Operating Guide
11.2.29 Low Water
Cause
The depth sensor connected to the smart card has activated depth protection.
Troubleshooting
• Check the following parameters:
-
Parameter 30-12 Depth Sensor Type.
-
Parameter 30-14 Depth at 4 mA.
-
Parameter 30-15 Depth at 20 mA.
- Parameter 34-1 Depth Trip Level.
- Parameter 34-2 Depth Reset Level.
- Parameter 34-3 Depth Start Relay.
- Parameter 36-9 Well Depth.
11.2.30 Motor Connection T1/T2/T3
Cause
This trip is not adjustable. The motor is not connected correctly to the soft starter.
Troubleshooting
• Check individual motor connections to the soft starter for power circuit continuity.
• Check connections at the motor terminal box.
• If the soft starter is connected to a grounded delta mains supply, adjust parameter 20-6 Motor Connection to match the motor
connection configuration.
11.2.31 Motor Overload
Cause
The motor has reached its maximum thermal capacity. The following can cause overload:
• The soft starter protection settings do not match the motor thermal capacity.
• Excessive starts per hour or start duration.
• Excessive current.
• Damage to the motor windings.
Troubleshooting
• Resolve the cause of the overload and allow the motor to cool.
• Check the following parameters:
-
Parameter 1-2 Motor Full Load Current.
-
Parameter 1-4 Locked Rotor Time.
-
Parameter 1-5 Locked Rotor Current.
-
Parameter 1-6 Motor Service Factor.
-
Parameter 5-15 Excess Start Time.
-
Parameter 6-10 Excess Start Time.
Parameters 1-4 to 1-6 determine the trip current for motor overload protection. The default settings of parameters 1-4 to 1-6 pro-
vide motor thermal protection Class 10, trip current 105% of FLA, or equivalent.
124 | Danfoss A/S © 2020.12
N O T I C E
Troubleshooting
AQ262141844215en-000401 / 175R1174