OMS
Operational Metering Summator Specification
| Memory |
| Ram |
128k |
| Real Time Clock |
| Accuracy |
Better than 7 seconds in 10 days
over full temperature range |
| Sync-input |
A voltage free contact closure
100-200ms on the half hour |
| Data Ports |
| Interrorgation port |
V24/RS232 |
| GRDO |
V24/RS232 |
| OMDO |
V24/RS232 |
| Comms-Out |
20mA bi-directional current loop active |
| Comms-In |
20mA bi-directional current loop passive |
| Meter Inputs |
| Channels |
32 contact closure |
| Voltage source |
15VDC (protected at 20V) |
| Current at 15V |
4mA typical |
| Max operation frequency |
7Hz |
| Frequency rejection |
Will not respond to >20Hz |
| Frequency Inputs |
| Number |
2 |
| Type |
Isolated 50Hz grid frequency |
| Input Voltage |
50-132VRMS |
| Outputs |
| Watchdog relay |
Two changeover contacts
(rated: 100VDC, 1A) |
| Summation (optional) |
8 mercury wetted relays
(rated: 500VDC, 100mA)
16 bi-directional current source |
| Analogue |
(rated: -12.75mA to +12.75mA) |
| Supply Input |
Nominal
Voltage range |
48VDC or 110VDC (AC options on request) |
| Input current |
42 to 137VDC
150mA (48VDC) |
| Fuse rating |
60mA (110VDC)
500mA (mounted on PSU) |
| Batteries |
| Type |
AA Alkaline |
| Hold up time (Memory/clock) |
>10 days (28 days on request) |
| Enviroment |
Temperature
Humidity |
+5deg. C to +55 deg.C
10% to 95% non-condensing
to NGTS 2.9,2.13 |
| Electrical |
Meter Inputs class Y
Supply Inputs class Z
Watchdog alarm class Z
Relay outputs class Y
Comms in/out class Z
GRDO/OMDO class Y
Analogue outputs class Y
Frquency inputs class Z |
| Mechanical |
| Mounting |
19 inch rack type |
| Panel height |
4 U (7 inches) |
| Depth |
13 inches plus sockets |
|
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