Eaton DS7 Series Instructional Leaflet Download

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Instructional Leafl et

IL03901003E

Effective May 2011

DS7 series soft start controllers, Frame 1 (4–12A)

EATON CORPORATION

www.eaton.com

Warning indications

Table 14.

Status

LED

Condition

Action

Start without enable

GREEN—1x/s, pulse 1/2s
RED—1x/s, pulse 1/2s
simultaneous

RUN command is issued without a
signal at the Enable terminal.

Apply Enable signal at terminal EN.

Note:

Thermal memory calculation is based on previous run conditions, not current potentiometer settings.

Overtemperature for next start

GREEN—1x/s, pulse 1/2s
RED—1x/s, pulse 1/2s
alternating

Thermal memory too high to attempt
a start.

Delay RUN command.
Reduce number of starts per hour.
Increase frame size of soft start controller

Note:

Thermal memory if the soft start controller calculates that the SCRs will be subject to overtemperature conditions during another start

attempt. Thermal memory calculation is based on previous run conditions, not current potentiometer settings.

Potentiometer not effective,
network operation

GREEN 1x/s, pulse 1/2s
+ 1x/s, pulse 1/8s
RED—Off

RUN parameter potentiometers cannot
be adjusted.

The soft start controller is connected to a control network.

Note:

The values of the potentiometers on the face of the controller are not recognized when the soft start controller is connected to a

network.

Fault indications

Table 15.

Status

LED

Condition

Action

Overtemperature, SCR (I2t)

GREEN – 2x/s, pulse 1/8s
RED—1x/s, pulse 1/2s
simultaneous

Operating temperature of an SCR has
been exceeded.

Allow controller to cool.
Reduce operating load.

Note:

Provide additional cooling to the enclosure if this fault is consistent with normal operation. Also consider increasing to a larger size soft

start controller with a higher current rating.

Overtemperature, electronic

GREEN—Continuous
RED—1x/s, pulse 1/2s

Temperature of the printed circuit
board has been exceeded.

Reduce operating temperature of the controller.
Install cooling fans.

Note:

Additional cooling may be provided with optional fans to reduce temperature inside the enclosure. If not mounted inside an enclosure,

move the controller to an optimum location to reduce operating temperatures.

Over/under temperature,
heat sink

GREEN—Continuous
RED—Continuous

Temperature of the SCR heat sink is
not within operating specifications.

Reduce operating temperature.
Increase operating temperature.

Note:

Indication is the same for either high or low temperature. Note operating temperature of the environment. An infrared temperature

device may be used on the face of the soft start controller to determine if the fault condition is either high or low temperature.

Thyristor defective

GREEN—Off
RED—Continuous

SCR is shorted.
SCR is open.

Inspect controller for shorted SCR.
Inspect controller for open SCR.

Note:

In troubleshooting this condition, please note that one phase is a pass through connection and will indicate very low resistance when

measured with test equipment. A shorted SCR will also indicate a very low resistance. Prior to replacing the soft start controller, verify that the
respective bypass relay is not stuck or welded in the closed position. Normal; thyristor resistance is greater than 10k ohms, measured from line
to load with all external devices disconnected from the controller.

Phase failure

GREEN—Off
RED—1x/s, pulse 1/2s

One or more of the line phases is missing.

Restore missing phases.
Close isolation contactors if installed.

Note:

Phase failure is not detected on the pass thru phase.

Bypass defective

GREEN—1x/s, pulse 1/2s
RED—Off

Bypass relay closed prior to RUN
command after initialization is complete.
Bypass relay fails to close at the end
of ramp time.

Inspect phases for evidence of closed bypass relay.
Inspect phases for evidence of failed relay (voltage drop).

Note:

Verify that the relay operates properly when TOR is achieved. Verify that the relay contacts are open when the controller has completed