Instruction manual – AP902 Arc Protection Unit
21 (35
)
A1008B
7.1
O
UTPUTS
7.1.1
T
RIP RELAYS
T1
AND
T2
The AP902 unit has integrated trip relays T1 and T2 for tripping of the circuit-breakers. T1
and T2 relays are normally open type (NO).
7.1.2
T
RIP RELAYS
T3
AND
T4
T3 relay output may act either as an electronic lock-out relay or as a trip relay. This option
must be specified when ordering. When T3 is factory configured as electronic lock-out
relay it is normally closed type (NC) and will hold its position until manual reset command
or until auxiliary power supply is lost. When re-applying the auxiliary power supply the
electronic lock-out relay will return to the contact condition prior loosing the auxiliary
power. This normally closed relay output can be used for tripping contactor controlled
devices.
Alternately T3 can be ordered as normally open (NO) type relay from the factory.
T3 relay follows the operation of T1 and activates whenever T1 is activated.
Trip relay T4 is a common trip relay that operates anytime T1 or T2 relay operates and
can be used either for tripping one more disconnecting device or for trip alarm to local or
remote monitoring and alarming system.
7.1.3
B
INARY OUTPUT
BO1
One binary output is available (+24V dc). Binary output function can be configured using
dipswitches (see chapter 3.5 Dipswitch settings).
Note: the binary output is polarity sensitive (see chapter 8 Wiring diagram).
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 AP902 detects a system error or disconnection of the auxiliary power
Summary of Contents for AP902
Page 1: ......
Page 35: ...Instruction manual AP902 Arc Protection Unit 35 35 A1008B ...
