Service manual

Functional Description

DCB, DCFCB and DCFCTB Models

 Proximity Switch Rotation Sensor Input: JP5-7 is used to connect a proximity

switch to detect siren rotation. You may leave this input unconnected if a

non-rotating siren is used or if JP10-3 is used to detect rotation. During a normal

siren activation (when the siren is rotating), the external rotation sensor, which is

usually an open collector proximity device mounted in the siren to detect gear

movement, provides active low pulses. Once this input receives more than 11 low

pulses during a siren activation, this input will latch active until a reset command

is received.

Digital Input for Current Sensor

JP5-5 is used to detect the main siren motor operating current during siren activation.

This input is pulled low when the external current sensor detects proper running

current during a siren activation. If this input is pulled low for 1/4 second, the input is

latched active until another activation command is received or a Reset command is

sent.

Digital Input for Intrusion Sensor

JP5-3 is used to detect an intrusion into the control cabinet. With the control cabinet

closed, the intrusion switch is in a normally closed position. If the intrusion condition

changes state for more than one second, an auto-report is sent.

Digital Input for Pressure Sensor (not used with 2001-130 sirens)

JP5-1 is used to detect blower pressure on Thunderbolt sirens during siren activation.

This sensor input latches when operating current is detected (input is pulled low) and

resets when a RESET command is received.

Relay Outputs

JP21

Out

Relay 1, Common

Relay 1, N.O.

Relay 2, Common

Relay 2, N.O.

Relay 3, Common

Relay 3, N.O. or N.C., depending on jumper JU1,

(N.C is standard)

Relay 4, Common

Relay 4, N.O. or N.C., depending on jumper JU2,

(N.O. is standard)

There are four (4) relay outputs, which are controlled by the microprocessor. The

relays provide isolation and are spike protected to prevent voltage spikes from

affecting the unit. As the relay coil is energized, the outputs close and the associated

LED lights. The DCFCB and DCFCTB come standard with two DPST relays. Relay