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Document No: LT0122 F3200 Installation & Programming Manual
Applications
Issue 2.7 5 July 2001 Page 9-11
LOGIC & CONFIGURATION (CONTINUED)
Configure Relay Supervision
Relay Enable Latch MAF LED Isolate Test Sup.Act
Gas Release Y - - - - - -
By default, relays are isolatable and testable but this can be changed if desired.
For all configuration, only items that have to be changed from default are shown.
9.2.3 NOTES
1. The variable V1 is used to initiate the timer rather than OC1 because outputs
(including OC) can be tested from the keypad. It is not desirable to have a "test"
function initiating the timer which releases gas.
2. The Guard relay is used to reduce the chances of accidental Gas Release (e.g. by
someone performing a "Test " on the Gas Release Relay). (The test function may be
inhibited, as may Isolate.) It uses a normally open set of contacts and is inserted
between +VBF2 and the NO terminal of the Gas Release relay (R3). It is preferable
to use an unused Brigade Relay (rated at 5A dc resistive) e.g. Isolate, if available
(not Standby), else an ancillary relay, or a module relay (each rated at 2Adc resistive)
on a separate 8RM to Gas Release. For multiple zones, a Module Relay "Guard"
relay can be common for 2 Gas zones, or Brigade Relay "Guard" relay can be
common to up to 5 Gas zones for 1A actuator loads. The common Guard relay
should be programmed to operate off the OR of the variables. For example:
ISO = V1 + V2 + V3 for a 3 Risk FIP which used ISO as the Guard relay.
If a Module relay, Rn, is used as the Guard relay, then +RnI should be added to the
equations for OC4 and OC5. (Similarly if an ancillary relay is used).
Unused Brigade relays may also be used as an alternative to the module relays
shown to switch the sounders where the load exceeds 2Adc.
3. The Gas Isolated switch turns on the Gas Isolated LEDs on the 1U/7U Panel and
LCSs directly, and causes a Gas Release relay supervision fault. The third set of
contacts on the Gas Isolate switch is connected to AZC 6 (Gas Isolated) as shown on
Drawing 1931-47,57 for ME0065,69 so that "Gas Isolated" status can show on the
LCD, be logged, and repeat from the FIP to an RZDU or remote FIP via a network.
The suitable EOLR is to be soldered across the switch contacts (yellow and black
remit wires) at time of building.
4. Snub (suppress) inductive loads (e.g. solenoids) with a suitably rated reverse diode.
5. The Gas Isolate switch isolates both +ve and -ve supplies to the solenoid. When not
isolated, however, the -ve supply is connected to 0V and only the positive supply is
switched by the relay. This allows the relay supervision to check for resistance from
the relay "common" contact to 0V.
7. See Section 9.2.4 re use of actuators.
8. Solenoids are typically less than 400 Ohms and require a diode (of sufficient rating)
to be wired in series at the solenoid to allow supervision. If two solenoids are
connected in parallel on one circuit the supervision will not detect one being
disconnected. Where multiple release circuits are diode connected (+ve & -ve legs)
onto a common solenoid, the supervision will detect shorts, but not all opens.