Figure 2 Control Module Coding Strip - General Monitors TA402A Instruction Manual

Model TA402A
Rear Ter mi nal Con nec tions (
A1 Im me di ate Warn
The terminal designations for the A1
Immediate Warn outputs are:
La bel Term De scrip tion
A1- C1 2z
2)
A1-1 4z
A1-2 6z Re lay Con tact
A1-3 8z Re lay Con tact
A1-4 10z Re lay Con tact
A1- C2 12z Re lay Com mon (3 & 4)
A1- OC 14z Open Col lec tor (OC)
OC Logic for A1 LED
LA1 24d
The A1 Immediate Warn outputs are DPDT
relays, 1 open collector output (A1-OC) that
follows the logic of the relays and 1 open
collector output (LA1) that follows the
blinking pattern of the front panel LED.
The A1-C1 designation is common for A1-1
& A1-2. The A1-C2 designation is common
for A1-3 & A1-4. The normally open (NO)
and normally closed (NC) contacts depend
on a user selectable option (see chapter 5).
The table below refers to the proper open
and closed A1 Immediate Warn relay
contacts while the unit is on power:
User Se lected Nor mally
Re lay State Open
Nor mally A1- C1 & A1-1,
En er gized A1- C2 & A1-4
Nor mally A1- C1 & A1-2,
De- Energized A1- C2 & A1-3
)
con tin ued
Re lay Com mon (1 &
Re lay Con tact
Nor mally
Closed
A1- C1 & A1-2,
A1- C2 & A1-3
A1- C1 & A1-1,
A1- C2 & A1-4
Fault Alarm
The terminal designations for the Fault
outputs are:
La bel Term De scrip tion
F-C 16z
F-1 18z Re lay Con tact (NO)
F-2 20z Re lay Con tact (NC)
F-OC 22z
FUA 32d Open Col lec tor (OC)
The Fault outputs are SPDT relays, 1 open
collector output (F-OC) that follows the
logic of the relays and 1 open collector
output (FUA) dedicated to new fault
indications. If the Backwards Compatible
configuration is ordered, the FUA will not
be present (pin 32d will be for +B, alternate
power supply). The Fault outputs are always
normally energized when power is applied
to the module.
The contact ratings for the A2 & A1 alarm
and Fault relays are 4A @ 250 Vac, 3A @
30 Vdc, Resistive, maximum.
Inductive loads (bells, buzzers, relays, etc.)
on dry relay contacts must be clamped
down. Unclamped inductive loads can
generate voltage spikes in excess of 1000
volts. Spikes of this magnitude may cause
false alarms and contact damage. Figures 5
& 6 show recommended relay protection
circuits for AC and DC loads, respectively.
Fig ure 5
Installation
Re lay Com mon
Open Col lec tor (OC)
9