Ice AP901, Инструкция по эксплуатации

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Instruction manual – AP901 Arc Protection Unit 26 (39
)
A1017B
7.1.4 S
YSTEM FAILURE RELAY
SF
System failure relay SF is a changeover type (NO/NC) and is energized in healthy condition.
Whenever AP901 detects a system error or disconnection of the auxiliary power 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 SENSOR CHANNELS
S1, S2, S3, S4
AND
S5
AP901 has 4 arc point sensor channels. Maximum three arc point sensors (type AS01 and
AS02) may be connected to each channel.
AP901 has an option of one fiber optic loop sensor channel with transceiver and receiver (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.
For details on sensors refer to “Arc Sensors Series – Instruction booklet”.
7.2.2 B
INARY INPUTS
BI1
AND
BI2
AP901 contains two binary inputs. The BI1 is always reserved for second trip criteria signal. In
the most typical application AP901 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.