參數(shù)資料
型號(hào)： PWA01CM485A
廠商： Electronic Theatre Controls, Inc.
英文描述： Monitoring Relays 3-Phase Load Guard
中文描述： 監(jiān)測(cè)繼電器三相負(fù)載衛(wèi)隊(duì)
文件頁(yè)數(shù)： 2/4頁(yè)
文件大小： 129K
代理商： PWA01CM485A
2
Specifications are subject to change without notice (09.12.05)
DWA01, PWA01
General Specifications
Power ON delay
Reaction time
1, 2, or 6 s ± 0.5 s
(input signal variation from
-20% to +20% or from
+20% to -20% of set value)
< 400 ms
< 400 ms
(15 min warm-up time)
± 1000 ppm/°C
± 0.5% on full-scale
Alarm ON delay
Alarm OFF delay
Accuracy
Temperature drift
Repeatability
Indication for
Power supply ON
Output ON
Environment
Degree of protection
Pollution degree
Operating temperature
@ Max. voltage, 50 Hz
@ Max. voltage, 60 Hz
Storage temperature
Housing dimensions
DIN-rail version
Plug-in version
Weight
Screw terminals
Tightening torque
LED, green
LED, yellow
IP 20
3 (DWA01), 2 (PWA01)
-20 to 60°C, R.H. < 95%
-20 to 50°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
22.5 x 80 x 99.5 mm
36 x 80 x 94 mm
Approx. 200 g
Max. 0.5 Nm
acc. to IEC 60947
UL, CSA
Yes
Electromagnetic Compatibility
According to EN 61000-6-2
According to EN 61000-6-3
Approvals
CE-Marking
EMC
Immunity
Emission
Mode of Operation
DWA01 and PWA01 can be
used for monitoring the
actual load of asynchronous
motors.
The relays measure the 3-
phase supply voltage and
the current of the phase L1
connected
to
chronous motor.
The relay monitor the cosine
of the angle between motor
current and motor voltage
(cos
).
As cos
varies with the load
of the motor, overload (or
Function/Delay/Level Settings
Level setting (cos
):
Knob adjustable on absolute
scale, from 0.1 to 0.99
an
asyn-
underload) can be indirectly
detected by DWA01 and
PWA01.
The relation between the
load and cos
depends on
the type of motor.
As a guideline to ensure cor-
rect working conditions for a
motor, the level could be set
above (or below) the cos
marking on the motor. It is
however recommended to
make the adjustment in con-
nection with a practical test.
The relay has an inhibit
delay at power ON in order
to avoid overload detection
during motor start.
Example 1:
Overload monitoring.
The relay operates and the
yellow LED is ON as long as
cos
is below the set limit.
The relay releases when it
exceeds the set level.
Example 2:
Underload monitoring.
The relay operates and the
yellow LED is ON as long as
cos
is above the set limit.
The relay releases when it
drops below the set level.
Example 3:
DWA01CM235A
PWA01CM235A can be used
for monitoring the cos
of a
1-Phase load with 208 to 240
V AC mains voltgage. In this
case the power supply has to
be connected between L1, L3
(or 5, 7) and L2 and L3 (or 6
and 7) have to be connected.
and
Setting of function and
power ON delay
Adjust the desired function
(over or underload monitor-
ing) with DIP switch 1 and
the power ON delay with
DIP Switches 3 and 4 as
shown on the below table.
To access the DIP-switch
open the plastic cover using
a screwdriver as shown on
the left.
Supply Specifications
Power supply
Rated operational voltage
through terminals:
Overvoltage cat. III
(IEC 60664, IEC 60038)
DWA01:
PWA01:
M23
L1, L2, L3
5, 6, 7
177 to 276 VAC 45 to 65 Hz
323 to 552 VAC 45 to 65 Hz
323 to 477 VAC 45 to 65 Hz
DWA01CM48
PWA01CM48
Dielectric voltage
supply to output
Rated operational power
Supplied by
None
2kV
13 VA @400VAC
L1 and L3
Monitoring function
ON: Under cos
OFF: Over cos
Not used
Power ON delay
SW3 SW4
OFF OFF:6 sec
ON
OFF:2 sec
ON
ON: 1 sec
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