DIGITAL VOLTMETER
EVM-3 / EVM-3C / EVM-3S
EVM-3 (Digital Voltmeter) :
EVM-3 is designed for accurate measuring of the AC RMS voltage and for
saving the minimum and maximum values of the measured voltages. Minimum
and maximum values remain stored in the memory when the power supply is
off. This stored values can be read when the power is on. Although EVM-3 is
mainly used for electrical panels, this device can also be used with any application
in which accurate voltage readings should be done between 10-600V. The
measurement (3-4) and power supply (1-2) connections are located on the rear
panel and the digital display is centered on the front panel.
EVM-3S (3-Phase Digital Voltmeter) :
EVM-3S has the same operating principles as EVM-3 but developed to measure
voltage in three-phase systems. By using button on the front panel, phase-
phase (L1-L2, L1-L3, L2-L3) and phase-neutral (L1-N, L2-N, L3-N) voltages can
be selected and read from the display.
EVM-3S (72x72) & (48x96) use 3-4 Terminals (L1-N) for supply input. Thus L1-
N voltage must be in operating voltage range (
D
U).
EVM-3S (96x96) has a separated connector for supply input.
.
EVM-3C (Setpointed Voltmeter) :
EVM-3C has the same functions of the EVM-3. In addition to these functions,
an over voltage level and time delay can be set. When the measured voltage
is over the set value, the output relay is activated at the end of the adjusted
time delay, generates an alarm signal and display starts blinking.
Minimum and Maximum Voltage :
The minimum and maximum voltage values are stored. User may read or delete
these values. Stored minimum and maximum voltage values remain stored,
when the power supply is off.
Setpoint (
SP
):
When the measured AC voltage between two points is over the setting value,
the output relay is activated in order to generate an error signal, at the end of
the delay time. If the AC voltage is 1.5 times of setting value, output relay is
activated without any delay. If the AC voltage value become lower the setting
value before the end of the delay time, the relay resets itself and no tripping
occurs.
Latch Function ( ):
In case of overvoltage the output relay is activated. Latch function is used to
select the output relay operation mode. Either 0 or 1 position may be selected.
At position 0: If the voltage is below the setting value, output relay releases
automatically, doesnt need any reset.
At position 1: Even if the voltage is below the setting value, output relay
remains activated until the reset and releases only by pressing the set button.
Instant Tripping
:
If the AC voltage is 1.5 times of setting value, the output relay is activated without
any delay time. This function is user selectable.
At position 0: Instant tripping is OFF.
At position 1: Instant tripping is ON.
Setting Latch Function (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
lt
is
displayed.
Press the
set
button.
Press
up
or
down
buttons until desired
value is displayed
Press the
set
button.
Setting Instant Tripping Function (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
tP
is
displayed.
Press the
set
button.
Press
up
or
down
buttons until desired
value is displayed
Press the
set
button.
Displaying and Deleting Tripping Number (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
OP
is
displayed.
Press the
set
button.
Press up button to delete tripping
number, else do not press any button.
Press the
set
button.
Adjustment Contact Situation (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
CO
is
displayed.
Press the
set
button.
Press
up
or
down
buttons until desired
value is displayed. (0: Normally open,
1: normally closed)
Press the
set
button.
Setting of Delay Time (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
dt
is
displayed.
Press the
set
button.
Press
up
or
down
buttons until desired
value is displayed.
Press the
set
button.
Displaying Phase-Phase or Phase-Neutral Voltage (For EVM-3S)
Press until
desired voltage
is displayed.
Escaping the Set Menu (For EVM-3C)
Set
If you do not want to change any
adjustment in the menu;
Press
up
or
down
buttons until
ESC
is
displayed.
Press the
set
button.
Factory Settings :
Set point value (
s p
)
Delay time ( )
Latch ffunction value ( )
Instant tripping function value
Contact situation ( )
: 250
: 10.0
: 0
: 1 (Instant tripping is on)
: 0 (Normally open)
ISO 9001 Q.M.S. Certificate
Setting of Set Point Value (For EVM-3C)
Set
Set
Set
Press the
set
button.
Press
up
or
down
buttons until
SP
is
displayed.
Press the
set
button.
Press
up
or
down
buttons until voltage
Set Point value is displayed. When
up
or
down
buttons are continiously pressed,
the display change quickly.
Press the
set
button.
Displaying Minimum Voltage (For EVM-3C)
Press and hold the
down
button to see.
Displaying Minimum Voltage (For EVM-3)
Press one time to see the minumum voltage
value
Displaying Maximum Voltage (For EVM-3C)
Press and hold the
up
button to see.
Press two time to see the maximum voltage value
Displaying Maximum Voltage (For EVM-3)
Deleting the Minimum and Maximum Voltages
Press
up
and
down
buttons at the same time.(For EVM-3C)
Press and hold for 2 seconds to delete demands
values (For EVM-3)
If the button is not pressed again within 20 seconds,
EVM-3 turns back automatically in measuring mode. (For EVM-3)
The decimal point blinks while the display shows demand values.
s p
0
i
s p
2 0. 0
2 5. 0
s p
s p
2 5 0
2 7 5
s p
0
p
i
s p
0 p
0 0 5
0 0 0
s p
0
0 0 0
e s c
0 0 0
(
p
)
(
p
)