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5 Diagnostics
5.1 Fault retrieval
5.1.1 Motor not starting
5.1.2 Motor stops immediately after start completed
5.1.3 Motor running unevenly
￫
The housing of the DS7 soft starter does not have to be opened
for diagnostics and fault detection tasks. The design of the soft
starter does not allow for it to be opened, and this may cause
lasting damage to the housing.
All possible fault causes can be determined by means of the
relevant indicators (LEDs, relays) or by taking measurements at
the connection terminals.
DS7-34D...-D soft starters can also be diagnosed using
SmartWire-DT (by reading the corresponding parameters).
The following information provides help in fault detection and
troubleshooting. Some possible faults are described below.
Possible causes:
•
Start signal (+A1) not present.
•
Enable signal (EN) not present (only with size 3 and 4).
•
No start or enable signal via SmartWire-DT (DS7-SWD only).
•
Mains voltage (U
•
Regulator supply voltage (U
•
Ramp time (t-Start) too long.
•
Start voltage (U-Start) too low.
•
DS7 diagnostics LED (Error) lights up.
Possible causes:
•
Switch off due to error message (Error), e.g. phase fault or frequency
fault.
•
Start signal (+A1) and/or enable signal (EN, only size 3 and 4) were
deactivated.
•
The connection, or signal transmission, via SmartWire-DT is faulty or has
been interrupted (DS7-SWD only).
Possible causes:
•
Motor output/motor current too low (<< 1.5 kW at 400 V)
•
too low centrifugal masses or no load on motor.
•
oscillating loads.
•
Slipping V-belts (check the load and the belt tension).
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
) not present.
LN
) not present.
s
5 Diagnostics
5.1 Fault retrieval
115
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