Woodward PLC controller card 9907-1200 module
Technical data of product parameters
The current transformer saturation is directly affected by the voltage at the current transformer secondary terminals. This voltage, for a ground fault, is developed in a 9907-1200
loop containing the phase and neutral conductor and additional load in this loop. For three phase faults, the neutral current is zero, and only the phase conductor
and additional phase load have to be considered.
In the calculation, the loop resistance should be used for phase to ground faults and the phase resistance for three phase faults.The current 9907-1200transformer effective overcurrent factor should meet the two requirement below. The requirement assume 40 to 300 msec maximum dc time constant
for the network.Compression reduces the number of periods that have to be
transferred per channel. Assuming the 12 points of a period
deviate by less than the specified compression factor from the
corresponding points of the preceding period, the points
themselves are not transferred, but simply the number of
repeats in relation to the preceding period. For example, if a
record consists of 100 periods all the same, then only the 12
points of one period and the number of repeats are transferred.
Compression is applied independently for each individual
channel. 9907-1200
The default address is 2. The slave address can be changed
using the operator program (HMI). The HMI has to be used to
assign an address to the device as defined in the station control
system. The device also responds to data with the address 900
which is used to synchronise all the devices in an SPA bus loop
simultaneously.Once all those binary inputs, IBB output signals and system and protection function events which are not to be recorded as 9907-1200
events (masked) have been loaded into the device (e.g. using
W14V155), they have to be copied to the non-volatile memory
using the save command W255V255:1 so that they are not lost
should the auxiliary supply fail.
Product picture display
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