4.3 Control Units
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| Free Standing Unit MEP*L | Rack Mounted Unit MEP*R |
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| Supply: | 1: 220/240V ±10%, 50/60Hz |
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| 2: 110/120V ±10%, 50/60Hz |
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| Power consumption: | Less than 7VA | Less than 6VA |
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| Output: | Alarm relay | Fault relay: SPCO, Energises in |
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| DPCO relay, energised in normal | fault mode |
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| mode, releases on fault or alarm | Alarm relay: High current SPCO, |
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| Low current DPCO, Energised in |
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| normal mode releases on fault or |
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| alarm |
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| See Table 2.1 for relay ratings |
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| Connections: | Screw terminal in the base of the | Terminal block on the rear of the |
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| case. | rack unit. |
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To take wires up to 1.5mm2
See Figure 2.7 for wiring details
| Earthing: | Mains input and sensor connections are fully floating with respect to earth. | ||
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| The earth terminal on the freestanding unit and the rack must be earthed. | ||
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| Intrinsic safety: | Units MEP*L and MEP*R are intrinsically safe. | ||
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| See table 2.2 for certificate details. | ||
| Output to Head Amplifier: | Approximately 11.5V 20mA maximum | ||
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| Temperature Range: | |||
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| The units must be left to warm up for 15 minutes before being exposed | ||
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| to | ||
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| Housing: | IP20 enclosure. Optional DIN rail | 19” rack unit to hold up to 14 | |
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| mounting or wall mounting. | controls. | |
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| Environment: | Maximum altitude : 2000m | ||
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| Maximum humidity : 95% | ||
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| Installation Category: | CAT II (264V a.c. MAX) Pollution 2 | ||
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| CAT III (132V a.c. MAX) Pollution 2 | ||
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| Indicators: |
| 3 LEDs | |
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| Green = Normal | ||
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| Red = Alarm | ||
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| Amber = Fault | ||
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| At least one LED should be on at any time. | ||
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| Fault Indication: | A fault is indicated if too much, or too little current is taken by the head | ||
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| amplifier, indicating a short circuit or an open circuit. | ||
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| Alarm relay | Alarm relay | |
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| Fault relay energises | |
| Test Switch: | a) Test Alarm Simulates the alarm condition by stopping the pulses. | ||
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| Alarm relay | Alarm relay | |
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| b) Test Fault simulates a short circuit in the cable between control | ||
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| room and the head amplifier, fault and alarm is indicated. | ||
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| Alarm relay | Alarm relay | |
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| Fault relay energises | |
| Alarm Delay: | |||
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| Reset: | Returns to normal approx. 200ms after alarm is cleared. | ||
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| E.M.C. | BS EN61326: 1998 (Emissions) for Class B Equipment | ||
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| BSEN61326: 1998 (Immunity) for continuous unmonitored operation in | ||
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| industrial locations |
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| L.V.D. |
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18
