5 Diagnostics
5.1 Fault retrieval
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com 115
5 Diagnostics
5.1 Fault retrieval
The following information provides help in fault detection and
troubleshooting. Some possible faults are described below.
5.1.1 Motor not starting
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
LN
) not present.
• Regulator supply voltage (U
s
) not present.
• Ramp time (t-Start) too long.
• Start voltage (U-Start) too low.
• DS7 diagnostics LED (Error) lights up.
5.1.2 Motor stops immediately after start completed
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).
5.1.3 Motor running unevenly
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).
￫
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).
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