Instruction manual

9-5
Section 9-3 - Dual-Circuit Control Module (DCDC)
Wheelock, Inc. Part Number: 107373
The Dual-Circuit Control Module (DCDC) provides all of the control capabilities for the
SAFEPATH
®
panel. The controller module supervises the Digital Voice Module (MDX-2), Dual-
Circuit Power Supply (DCPS), and amplifier modules (SAA-40S, SAA-80S/SE, and SALL-15S) for
proper operation. The microphone is supervised for connection.
The channel playing contacts from the digital voice module (MDX-2) are monitored to determine
their status (e.g. active or inactive). If the channel playing contact is inactive, the control module
routes a supervision tone to each of the amplifier circuit modules and monitors the amplifier for
functionality. If the channel playing contact is active, the control module routes the audio from
that channel’s line output from the digital voice module to the respective amplifier circuit module.
Wiring used to monitor the channel playing contacts and to route the line outputs from the digital
voice module is supervised for open and short circuit conditions.
The DCPS module is supervised for three conditions: low AC input power, battery wiring trouble,
and battery voltage low. The wiring between the controller module and the battery charger is
supervised for open and short circuit conditions.
The amplifier modules are supervised for two failure conditions: field wiring trouble conditions and
amplifier audio output trouble conditions. The controller module only supervises the audio output
during standby conditions. When either a message is playing from the digital voice module or a
live announcement is being made from the microphone, the field wiring and audio output are not
supervised.
If at any time a trouble condition is detected, the controller module will energize the internal
audible and the external trouble audible circuit transfer the Form C trouble contact to the trouble
position, turn off the “NORMAL” indicator, and turn on the “TROUBLE” indicator.
Synchronized signal for the Strobe NAC circuits can be energized by turning ON DIP switch SS.
This will cause the Wheelock Synchronized Strobes to flash at the same time.
Other controls from the DIP Switches are, Remote Microphone ON/OFF (RM), and selection of
supervisory tone from the built in tone generator (T1, T2, T3).
There are two 0.5A fuses on the printed circuit board. F1 is the fuse for Remote Microphone
power, and F2 is the fuse for the external trouble audible. See Figure 9-3 on Page 9-6 for fuse
location.
Nominal Specifications:
Input Voltage Range 20 to 28VDC
Supply Current (Idle) @ 24VDC 75mA
Supply Current (Full Load) @ 24VDC 130mA
Operating Temperature Range 0 to 49 Degrees C (32-120
Degrees F)
Humidity Range 0 to 85%, Non-condensing