Ice AP902, Инструкция по эксплуатации

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Instruction manual – AP902 Arc Protection Unit 22 (35
)
A1008B
supply the contact changes its state. The state of the SF relay remains the same until the
unit returns to a healthy condition and SF relay is energized again.
7.2 I
NPUTS
7.2.1 A
RC FIBER OPTIC LOOP SENSOR CHANNELS
S1, S2, S3
AP902 has 3 fiber optic loop sensor channels with transceivers and receivers (Tx, Rx).
When the fiber optic loop sensor is connected to the unit one end is connected to Tx and
another to Rx. This sensor loop is then continuously monitored by means of test light
pulse travelling through the loop. In case of discontinuity in the loop the unit goes into
error mode and activates the error LED and SF relay output.
Maximum 40 meter length of fiber sensor (type AS06 and AS07) can be connected to
each channel.
For details on sensors refer to “ Arc Sensors Series - Instruction booklet”.
7.2.2 B
INARY INPUTS
BI1
AND
BI2
AP902 contains two binary inputs. The BI1 is always reserved for second trip criteria
signal. In the most typical application AP902 is receiving overcurrent information from ICE
AP910 device. Overcurrent information may come also from NP900 Series protection
relays. Alternately any other signal (such as undervoltage, or similar) can be used as
second trip criteria along with light information.
Note: when AP902 receives overcurrent signal from NP900 Series protection relays the
actual operation time depends on the operation time of the external device and so total
operational time cannot be specified or guaranteed.
The BI2 can be used for receiving a trip signal or arc light signal. The function of the BI2 is
configured using dipswitches, see chapter 3.5 Dipswitch settings.
The inputs are activated by connecting a dc signal exceeding the specified nominal
threshold level of the corresponding input. There are three different nominal threshold
levels available, 24 or 110 or 220 Vdc. The desired threshold value has to be specified
when ordering. The actual activation of the binary input occurs at 80% of the specified
nominal threshold value (i.e. 19 Vdc, 88 Vdc or 176 Vdc).