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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