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ULSE
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OWER
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8
Front panel, acknowledge switch, slot alarm inactive, with I2C response, replaced module
In this state the summary alarm module assumes that a faulty module has been replaced. After pressing the ACKNOWLEDGE switch the
BUZZER is OFF and the STATUS LED is in normal state (see section 2.2.1). The relay will be in its normal state.
Front panel, acknowledge switch, slot alarm inactive, with no I2C response, fail module
In this state the summary alarm module assumes that a faulty module is fitted in the slot. After pressing the ACKNOWLEDGE switch the
BUZZER is MUTED and the STATUS LED is in ALARM acknowledged state (see section 2.2.1). The status of the relays remains
unchanged.
Rear panel
2.3.1
Rear panel, module rear connections
The rear panel provides interconnections for two dry contact relays. These can be accessed via the
connector J2. Both relays are triggered by the same condition signal, but they are electrically isolated. All the
pins are volt free.
The module has a 6-pin connector; this is available at the rear of the module.
The three connections for each relay are
NO - Normally open
COM - Common
NC - Normally closed
Connections from Relay 1 are also connected in parallel to the rack chassis backplane.
The rear panel provides interconnections for two dry contact relays. The many be accessed via a six way
screwless connector, it is suitable for use with 14
– 22 AWG wire
J2
Name
ALARM = OFF
ALARM = ON (or POWER=OFF)
Pin 1
NO_1
Relay 1
NO1 is open circuit
NC1 is shorted to COM1
Relay 1
NC1 is open circuit
NO1 is shorted to COM1
Pin 2
COM_1
Pin 3
NC_1
Pin 4
NO_2
Relay 2
NO2 is open circuit
NC2 is shorted to COM2
Relay 2
NC2 is open circuit
NO2 is shorted to COM2
Pin 5
COM_2
Pin 6
NC_2
2.3.2
Rear panel, backplane relay connection
Relay 1 is connected in parallel to the backplane, making it available on the rack chassis connector. See your rack chassis handbook.
User configuration DIP switches
The summary alarm card is fitted with DIP switch allow you to configure the module. It has two eight way DIP switches (SW2 and SW3), that
configures the alarm operation and one four way DIP switch (SW5) that configures the load.
NO2 COM2 NC2
NO1 COM1 NC1
CONTROL
CONTROL
ALARM=OFF
NO2 COM2 NC2
NO1 COM1 NC1
CONTROL
CONTROL
ALARM=ON
