Eaton DS7 Series, Manual

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8 SmartWire-DT
8.9 Programming
DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com
181
8.9.3.13 Device protection for DS7-SWD soft starters (bytes 3, 4 – profile 11)
By connecting a PKE motor-protective circuit-breaker upstream of the
DS7-SWD soft starter, the soft starter can be protected against overloading
and excessively frequent starts. The thermal load magnitude is indicated in
the cyclic data in profile 11.
When the 100 % mark (0x4000) is reached, the soft starter will trip with an
“overload error” error message and will stop the motor.
8.9.3.14 Profile 11: outputs
(transmitting external current values to the DS7 soft starter, firmware V48 and higher)
The current’s absolute value can be transmitted in profile 11, word 1 in order
to make it possible to protect the device without having to directly connect
the DS7-SWD soft starter to a PKE motor-protective circuit-breaker. In order
to be able to do this, the current must be measured and correctly scaled
externally. The PLC will then be used to transmit an actual current value.
The value being transmitted (from 0 to 800 %) is scaled relative to the trip
block’s maximum value. The percentage value is scaled within the
representable word range of 0x0000 to 0xFFFF and is then written to the soft
starter’s control data (byte 2 and byte 3).
If no current is measured, a value of 0 will be transmitted as the current value
to the DS7 soft starter.
The rated operational current for the current measuring block, or the rated
motor current, needs to be entered into parameter PNU 290.0. This current
will be used as a reference value representing a percentage of 100 %.
The one being transmitted to the DS7 soft starter will be scaled within a
range of 0 to 800 % (corresponding to 0x00 to 0xFFFF): 100 %
≙ 0x2000
1, 2 10 TOR Top of ramp:
0: Top of start ramp not reached
1: Top of start ramp reached
11
1)
CL Current limit:
0: Current limit not reached;
Voltage ramp OK
1: Current limit reached;
Voltage ramp frozen
12 – Not used
3, 4 0 - 15 Utilization (Int16) Utilization capacity %:
0 - FFFF
≙ ±200 %
0x4000 ≙ ±100 %
Trip at 100 %.
1) Bit 11 will only be activated if parameter 681.0 is set to 1.
Byte Bit Designation Meaning