V-RTU2000 Series
Chapter 6 - Digital Output Unit
Veesta - Remote Terminal Unit
Technical Specification Manual
Page 46 of 90
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6.2
DO Card
Digital Output Card is an intelligent IO Card, which is used to control
the operation of field equipment, such as the use/lock of protection
relay, manual/auto of transformer AVR control, and AGC control of
generator set, etc. Providing basic CPU comply with its Firmware,
also providing the drive circuit, for control output. It connects with
CPU Card through LIOC RS-485 communication interface, the DATA
& /DATA Communication Signal is linked by the backplane without
additional wirings. The external connection contains 8 Digital Output
Points (CH1~CH8), 1 Common Point (COM+) and 1 Framing Ground
(FG) in the model of VR-2736 and 2 Common Point (COM1,COM2)
in the model of VR-2736A, which are transmitted through 96-Pin DIN
Connector to 10-Pin terminal on the backplane for actual application.
On VR-2736 DO Card, the relay contact is designed in 1a+1b for the
user to select “a” type contact or “b” type contact. On VR-2736A DO
Card, there is selectable by strap of J2, J3 to choose auto-resettable
fuse for two output contacts and/or high current 10A fuse with Main
Execution Relay.
6.2.1 VR-2736 Specifications
1.
Microprocessor
:
AT89C2051, 12MHz
2.
Memory
:
2K Bytes Flash ROM
128 Bytes SRAM
3.
Output Channels
:
8 Channels
4.
Contact Type
:
1 Contact O/P
5.
Contact Rating
:
5A at 250V AC
5A at 30V DC
6.
Max. Switching Voltage
:
380V AC
125V DC
7.
Isolation - Coil to Contact :
AC 2000V
8.
Common Mode Voltage
:
250V DC (Min.)
9.
Surge Withstand Capability:
(SWC)
ANSI/IEEE C37.90.1-1989
(3KV Oscillatory Test, 5KV Fast Transient Test)
10.
Power Requirement
:
+5V DC ±5%, 100mA
11.
Card Dimension
:
160mm * 100mm
12.
Environment
Operating Temperature :
Storage Temperature
:
Relative Humidity
:
-25°C to 70°C
-40°C to 85°C
10% to 95% non-condensing
