Control Units - Emerson Mobrey Instruction Leaflet

4.3 Control Units

Supply:
Power consumption:
Output:
Connections:
Earthing:
Intrinsic safety:
Output to Head Amplifier:
Temperature Range:
Housing:
Environment:
Installation Category:
Indicators:
Fault Indication:
Test Switch:
Alarm Delay:
Reset:
E.M.C.
L.V.D.
Free Standing Unit MEP*L
Less than 7VA
Alarm relay
DPCO relay, energised in normal
mode, releases on fault or alarm
Screw terminal in the base of the
case.
Mains input and sensor connections are fully floating with respect to earth.
The earth terminal on the freestanding unit and the rack must be earthed.
Units MEP*L and MEP*R are intrinsically safe.
See table 2.2 for certificate details.
Approximately 11.5V 20mA maximum
The units must be left to warm up for 15 minutes before being exposed
IP20 enclosure. Optional DIN rail
mounting or wall mounting.
CAT II (264V a.c. MAX) Pollution 2
CAT III (132V a.c. MAX) Pollution 2
At least one LED should be on at any time.
A fault is indicated if too much, or too little current is taken by the head
amplifier, indicating a short circuit or an open circuit.
Alarm relay de-energises
a) Test Alarm Simulates the alarm condition by stopping the pulses.
Alarm relay de-energises
b) Test Fault simulates a short circuit in the cable between control
room and the head amplifier, fault and alarm is indicated.
Alarm relay de-energises
1-10 seconds. Preset on front panel (20 turns span)
Returns to normal approx. 200ms after alarm is cleared.
BS EN61326: 1998 (Emissions) for Class B Equipment
BSEN61326: 1998 (Immunity) for continuous unmonitored operation in
industrial locations
EN61010-1
Rack Mounted Unit MEP*R
1: 220/240V ±10%, 50/60Hz
2: 110/120V ±10%, 50/60Hz
Less than 6VA
Fault relay: SPCO, Energises in
fault mode
Alarm relay: High current SPCO,
Low current DPCO, Energised in
normal mode releases on fault or
alarm
See Table 2.1 for relay ratings
Terminal block on the rear of the
rack unit.
To take wires up to 1.5mm2
See Figure 2.7 for wiring details
-10ºC to 65ºC
to sub-zero temperatures.
19" rack unit to hold up to 14
controls.
Maximum altitude : 2000m
Maximum humidity : 95%
3 LEDs
Green = Normal
Red = Alarm
Amber = Fault
Alarm relay de-energises
Fault relay energises
Alarm relay de-energises
Alarm relay de-energises
Fault relay energises
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