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aVS3p-0
The AVS3P-0 is an Automatic Voltage Switcher designed to protect three
phase loads from voltage fluctuations, over voltage, under voltage, surges,
dips and frequent start/stops. The output is a single volt-free changeover
contact, rated at 16A. This is intended to control an external contactor,
control circuit, start/stop system or alarm. if the voltage on any one phase
goes above or below the pre-set limits (the ‘window’), then the AVS
will switch off. once the voltage returns within the window limits, the
AVS will wait for a pre-set time, continuing to check the voltages, before
automatically turning the load back on. The over voltage, under voltage
and delay settings are all adjustable using controls in the terminal compartment of the AVS3P. The
standard window that is considered acceptable is 185V-260V(320V-450V three phase). outside these
limits electronic and electrical equipment are likely to be damaged.
operation
connect the AVS in accordance with the wiring diagram opposite (fig 1). Ensure that the r, S
& T sensing connections to the AVS come from the supply side of the contactor. note: a good
neutral connection must be provided from the supply.
The output from the AVS is a changeover relay with volt-free contacts. There is a common (c),
a normally open (no) and normally closed (nc) contacts. when the AVS3P-0 is in the red or
Amber condition then c is connected to nc. when the AVS3P-0 displays green then c is
connected to no. make sure that the control current you wish to switch does not exceed the
rating of the AVS3P-0 relay (max 16Amps).
if the AVS is the only thing to control the contactor (or load, or alarm, etc), then the ‘c’ and ‘no’
AVS contacts can be used to connect power to the contactor coil (method A). if however, there
are other circuits/equipment that also must control the contactor, then the AVS contacts can be
used to interrupt the contactor coil supply from there (method B) or used in conjunction with a
start/stop or other system, e.g. method c.
Figure 1.
AVS3P-0
wiring
diagram
Diagram three
R
N
C
C N
O
S T N
A1
T 1
L1 L2
T 2 T 3
L3
A2
N
R
N
C
C N
O
S T N
R
N
C
C N
O
S T N
To The Load
Live to contactor coil
Live from
other control
(option c)
(option A)
AVS3P-0
contactor
Three Phase Sense wires
Switched Live to contactor coil
To Stop control
From 24V dc
To Start control
(option B)
model AVS3P-0
115V
240V
current (Amps)
16A@230V
16A@230V
nominal voltage(V)
115/220V
230/240V
wait time (mins)
10 secs to 10mins
10 secs to 10mins
window limits
adjustable
adjustable
hysteresis(V)
2
4
Socket type
direct via brass screw terminal
Fused plug
n/A
n/A
rFi protection
no
no
Attenuation(db)
no
no
Transient suppression
yes
Spike protection(J)
80J@115V
160J@230V
max consumption
35VA
35VA
max supply (phase to neutral)
160V
320V
SpeciFicationS
1.
2.
3.
led colour
Indicating
load Status
red
High incoming voltage
oFF
yellow
AVS is in wait state after a high voltage transition
oFF
green
Mains normal
on
yellow
AVS is in wait state after a low voltage transition
oFF
red
Low incoming voltage
oFF
Five LEds accurately display the status
of the AVS in the following symmetrical
traffic light design:
OFF
Wait
ON
Wait
OFF
HIGH
LOW
Set limits of the AVS3P-0 using the thumb-wheel adjustment inside the terminal compartment.
See fig 2. Ensure that limits set are safe for the load being protected. For example: Low =185V
and high = 260V is normally considered safe for most equipment but you should check with the
equipment manufacturer’s information.
Set the time delay control using the thumb-wheel adjustment inside the terminal compartment.
This will depend on your load and how it is operated. As a general guide, compressors and
refrigeration equipment will need at least 3 minutes; motors, pumps, etc should not be started
too frequently so may be 2 minutes minimum, electronic loads 0.5 minutes. The ‘off’ position
gives just 10 seconds. The equipment manufacturer should be consulted on the best setting.
At first switching on, there will be no output during the delay period. For that period the yellow
LEd indicates that the mains supply is within acceptable limits, after which the green LEd goes
on and the output relay changes state to turn the load on.
4.
5.
6.