EV/DV300 Series Power Meter
Chapter 2: Installation
V:2.0 Revised October 2018
21
The max AO load for the 3 modes are,
4~20mA:
Max load resistor 500Ω
0~1mA:
Max load resistor 10k
Ω
0~5V:
Max current 20mA
24Vdc Power Supply
There is an 24Vdc power supply in IO extend of EV300 series. The terminal name and number
is AO2+, AO2- (33, 34), corresponding with (24V+, 24G). The voltage output range is 24V
(±10%), power rating is 2W and isolate voltage is 1000Vdc.
Note:
Only one option can be chosen between 24Vdc power supply and Analog output.
Alarm Output
There is an alarm function in EV300 series meter. The alarm will be triggered when a metering
parameter is over the limit value and over the setting time limit. The alarm can be related to
relay output or LCD back-light flashing. The setting of alarm is as following:
1.
Set the relay output mode as alarm. (RO=2).
2.
Assign metering parameter to alarm. (Refer Table 2-2)
3.
Set alarm value limit.
4.
Set alarm time limit. (Min time:1s, Range: 0~255s)
5.
Sign of the inequation. (0: parameter value limit)
6.
Relate to relays. (0:RO1, 1: RO2, 2: RO1 and RO2)
For register of setting parameters please refer to 4.3 of this manual. Serial number versus
alarming parameter is listed in Table 2.2. Number 0 means no parameter is assigned to alarm.
Table 2.2 No. versus alarm parameter
No. Parameter No. Parameter No. Parameter No. Parameter No. Parameter No. Parameter
1
U1
2
U2
3
U3
4
U12
5
U23
6
U31
7
I1
8
I2
9
I3
10
Uavg
11 ULavg 12
Lavg
13
P
14
Q
15
S
16
F
17
PF
18
In
Example:
Alarming parameter: I1,
Time limit:
15s,
Alarm output relay:
RO1,
Rating of CT1 of I1:
200A,
Value limit:
180A.
