INFICON LDM250/LDM450/LDM650 Low Voltage Instruction Manual

INFICON LDM250/LDM450/LDM650 Low Voltage

LDM 250 450 650 Low voltage Multipoint unit

Wiring diagram

Logical matrix

Features

The LDM250, LDM450 and LDM650 are central units with two/four/six channels(sensors).
The LDM250/450/650 is a multi-channel microprocessor-based gas monitoring system. Each, up to a maximum of six channels, can be individually configured to monitor different gases with up to three alarm concentrations all with status LEDs.

Other features include:

• User configurable alarm time delays
• Manual/auto alarm reset for each channel
• Built-in service function and self-test program
• Four alarm relays with 230 volts rated SPDT contacts
• Failsafe relay operation on power loss
• Audible alarm
• Low voltage output for auxiliary alarm indication.

Please Note!
The LDM250, LDM450 and LDM650 are normally supplied with default set alarm thresholds. These must be verified or reset during commissioning. Alarm levels must always be set on each channel for proper gas and detector type.

Default settings from factory:

Alarm levels, factory settings are:

Models (sensors included)

Function

After connecting each detector and applying power, the green LED on each channel will flash as the pre-heat process commences. After approximately 4 minutes the green LED will illuminate permanently, and the sensor is fully operational. Each channel has one yellow and two red warning LEDs. The yellow LED indicates a low-level gas leak (above alarm threshold C) whilst the two red LEDs indicate gas concentrations above thresholds B and A.

When gas is detected above the respective alarm threshold the appropriate LEDs will flash until the appropriate time delay has expired when it is permanently illuminated, and the corresponding relay contacts change state. As the gas concentration subsides the LEDs and relays will return to their normal state unless the ‘manual reset’ function has been selected. The audible alarm will initiate if it is configured with the respective alarm threshold and cannot be muted. Technicians can inhibit the alarm by selecting ‘Service Mode’.

AUTO/MANUAL ALARM RESET
DIP switch (5) no3 on each channel’s control card manages the alarm reset function. “ON” enables Auto reset and “OFF” enables Manual reset, via pressing “Reset/Test/Service”-button (7).

ALARM TIME DELAY (T1)
DIP-switch (5) controls the alarm time delay for each channel.

no1| no2|
---|---|---
on| on| No alarm delay
off| on| 1 minute delay
on| off| 10 minutes delay
off

| off| 30 minutes delay

RESET/TEST/SERVICE-BUTTON (7)
Reset/Test/Service-functions is accessible via a pushbutton on the cover.
Pressing the “Reset/Test/Service”-button (7) on any channel for 5 seconds initiates the test program. This sequentially energizes each LED and relay at five second intervals. All LEDs on the chosen channel will go out when the test program has started.

SERVICE MODE
Pressing the” Reset/Test/Service” button (7) for 10 seconds will inhibit all alarm functions for the chosen channel for 60 minutes. Service mode is indicated by all LEDs on the chosen channel is flashing. A new 60 minute inhibit period can be initiated by repeating the process. Normal operation will be automatically resumed after 60 minutes or can be cancelled by pressing the “Reset/Test/ Service”-button briefly.

FAULT MODE
In the event of a detector failure (GV offset < 0,1V) or disconnection of the interconnecting wiring a fault condition will be indicated by loss of the green ‘Active’ LED, the other LEDs start to flash and the alarm relay D is de- energised. In the event of power failure all relays (A, B, C & D) will be de- energized. Connections are available for an optional battery back-up to enable total continuity of operation in the event of a power failure. A 4-hour delay can be configured for relay D to prevent nuisance alarms. This is activated by setting DIP switch (5) no4 on the respective channel card to ‘ON’. The operation of the LEDs will remain unchanged.

INTERNAL BUZZER AND 24VDC AUXILIARY OUTPUT
The internal buzzer (1) and 24VDC output can be activated by the DIP-switch (4) on the terminal board and can be user configured to operate from alarm concentration A(no1), B(no2) or C(no3). Setting the DIP-switch to ON for the respective alarm level selects the appropriate alarm level. The 24VDC auxiliary alarm output is always activated together with the buzzer. However, by removing jumper Bb (3) the buzzer can be disabled.

Please Note!
After being powered off for prolonged periods the sensor may take several minutes to stabilize during which time ‘false’ alarms may be initiated. Such ‘false’ alarm shall disappear within a few minutes.

Remote sensors
LDMR series is a range of remote sensors designed for use with the LDM units.
Low voltage LDM250, LDM450, or LDM650 units include either 2, 4, or 6 LDMR remote sensors for detecting HFCs, HCFCs, and mixtures and carbon dioxide (CO2).

Please Note!
The sensors used in the LDMR series have limited selectivity and are therefore not gas specific. Care should be taken when installing the equipment to minimize any cross contamination from other gases or vapours.
For further guidance on specific applications contact us.

Location/Installation

Correct location of the LDMR is essential to ensure optimum operation of the system. Special consideration must be given to air movement and whether the gas to be detected is heavier or lighter than air. For gases heavier than air (e.g. Refrigerants (HFC, HCFC) or CO2) the sensor should ideally be located approximately 20cm above floor level. Connect the sensor according to the wiring diagram.
NOTE! For unused channels a jumper (8) must be mounted and a >100 kohms resistor (attached) must be installed between (+) and (S) to prevent open sensor alarms.
Otherwise, the channel will indicate a fault alarm.
When changing or replacing a LDMR a new calibration must be performed.

ALARM LEVELS / CHANGING ALARM LEVELS
The unit is normally supplied with default set alarm thresholds.
These must be verified or reset during commissioning.
To set or change the alarm thresholds you need a MCT150 Calibration tool and a small screwdriver.
Full details regarding custom alarm set-points for a range of gases together with a detailed procedure are outlined in specific data sheets. Multiple gases and alarm set-points can be accommodated on a single LDM as each channel is totally independent.

Function Control
Testing the system is recommended to be done once a year. A basic function test can be performed using MCT150. Extended control and calibration require test gas with a specific concentration.

Technical Data

Specifications subject to change

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References

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