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BETA Monitoring
Monitoring of Plants and Devices
14/26
Siemens ET B1 · 10/2008
*
You can order this quantity or a multiple thereof.
14
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Overview
The p.f. controllers monitor the phase displacement between
current and voltage. Because the phase displacement angle
changes with the load of the motor, this measurement method is
ideal for the monitoring of asynchronous motors for underload
and no-load operation, independent of size. However, in some
cases, the p.f. barely changes if the load of the motor changes,
e.g. in the case of relatively minor load changes on large-scale
motors or single-phase split-pole motors or collector motors.
The p.f. controller monitors single and three-phase asynchronous
motors up to approx. 5 A (without current transformer) for underload
and no-load operation. This is phase-sequence independent and
increases plant availability. Typical applications are fan monitoring
in the case of V-belt breakage, pump monitoring in the event of
valve closure or dry runs. A current transformer is used for
higher rated currents.
If the p.f. value set at the p.f. controller is fallen below for the
duration of the set response delay, the output relay switches to
the alarm state and the red LED lights up. If it exceeds the p.f.
value, the output relay switches back without any significant
delay.
•
Adjustable p.f. response value, from 0 to 0.97
•
Current range up to 8 A
•
LED display for operation and alarm
•
Automatic resetting of alarm.
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Benefits
•
The ultra compact p.f. controller requires only the smallest of
spaces and saves costs.
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Technical specifications
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Selection and ordering data
5
TT3 472
Standards
IEC/EN 60255, VDE 0435
Rated control voltage U
c
3
V AC 400
Operating range
With AC supply
×
U
c
0.8 ... 1.1
Frequency range f
n
Hz
45 ... 65
Rated power dissipation P
v
VA
Approx. 11
Rated impulse withstand voltage U
imp
Against contacts
kV
< 4
Current measuring circuits
For AC systems
Current measuring range
I
meas
A AC 0.4 ... 8
Short-time overload capability
For 2 s
A
20
For 0.5 s
A
40
Current transformer
,
Class 3 or better
Secondary current
A
1
or 5
Setting ranges
Adjustable
p.f.
0 ... 0.97
Response delay
Adjustable
s
1 ... 100
Short-circuit strength
Fuse 4 A gL
A
4
Contacts
contact
1
CO
•
Rated operational voltage U
e
V AC 250
•
Rated operational current
I
e
Thermal current
A
4
AC-15 NO contacts
A
3
AC-15 NC contacts
A
1
AC-13 at 24 V DC
A
1
•
Minimum contact load
V; mA 10; 100
Terminals
•
Terminals
±
screw (Pozidriv)
PZ 2
•
Conductor cross-sections
-
Rigid
Max.
mm
2
2
× 2.5
-
Flexible, with end sleeve
Min.
mm
2
1
× 0.5
Permissible ambient temperature
°C
-20 ...
+60
Resistance to climate
Acc. to EN 60068-1
20/60/4
Degree of protection
Acc. to EN 60529
IP20, with connected conductors
Contacts
U
e
I
e
U
c
MW DT Order No.
Price
per PU
PG PU PS*/
P. unit
Weight
per PU
approx.
V AC A AC V AC
Unit(s) Unit(s) kg
p.f controllers
For monitoring of the underload of motors
up to approx. 5 A AC by making
p.f. measurements,
setting range p.f. from 0 to 0.97
1
CO 4
3
× 400 0.4 ... 8 1 B
5
TT3 472
027 1
1
0.065
5
TT3 472 p.f. controllers
© Siemens AG 2008