Instruction 5700-9001
GDA-1600 16-Channel Controller
31
and do not require discrete relays for each of the 48 alarm events (16 A1s, 16 A2s & 16
A3s). If discrete relays are needed for all 48 alarms, then six PCBs are required.
5 VDC power to the discrete relay option PCBs is normally supplied from the GDA-1600
Controller via the slender I
2
C cables connected to J2 and J3. However, I
2
C cables are
limited in ability to carry this power further than a few feet without a significant voltage
drop. Some GDA-1600 applications with relays for all 48 alarms may require up to 6
boards. TB2 allows a heavier 5 VDC power cable to be connected from terminals on the
back of the GDA-1600 front panel assembly, bypassing the I
2
C cable. A 20AWG pair
connected to only one of the several TB2s is sufficient when these boards are in close
proximity to each other.
All relays are rated at 5 Amp for 28 VDC and 250 ~VAC RESISTIVE loads.
!
IMPORTANT:
Appropriate diode (DC loads) or MOV (AC loads) snubber
devices must be installed with inductive loads to prevent RFI noise spikes.
Relay wiring should be kept separate from low level signal wiring.
4.2.3 Optional *
Bridge Sensor Input Board
#
5700-0011
An optional 8-channel, 12 bit
Bridge Sensor Input
board allows these popular gas
detectors to be connected directly to the GDA-1600 without additional signal
conditioning or transmitters. Fault supervision circuitry forces the GDA-1600 into a
FAULT condition upon sensor failure or removal.
This option may also be configured to accept 4-20mA inputs for mixing bridge sensors
and current loops into the same board. Placing any channel’s 2-position LEL/4-20mA
jumper into 4-20mA position and installing the associated precision 100 ohm socketed
resistor allows 4-20mA signals to be applied to its C & A terminals.
Channels receiving input data from this board should have the
Data From:
menu set for
Sensor,
as described in section 3.2.4. This activates
Cal Mode
menus, described in
section 3.2.7, which are needed to
zero
and
span
sensor readings. After performing the
one time only
Initial Setup
as described below, all subsequent calibrations are by the
GDA-1600’s electronic Cal Mode menus.
*Catalytic sensors connected directly to the GDA-1600 should be limited to ranges of 0-1000ppm.
Summary of Contents for GDA-1600
Page 21: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 21 Figure 3 10 Configuration Menus ...
Page 28: ...GDA 1600 16 Channel Controller Instruction 5700 9001 28 Figure 4 2 Main PCB ...
Page 36: ...GDA 1600 16 Channel Controller Instruction 5700 9001 36 Figure 4 7 Analog Output Board ...
Page 38: ...GDA 1600 16 Channel Controller Instruction 5700 9001 38 Figure 5 2 System Diagnostic Options ...
Page 53: ...Instruction 5700 9001 GDA 1600 16 Channel Controller 53 ...
