Monitoring Relays
Motor temperature
Types DTA01, PTA01, DTA02, PTA02
Motor temperature monitoring relay
Measuring ranges: PTC according to EN 44081
Remote and local alarm reset (DTA02, PTA02)
Output: 8 A SPDT relay normally energized
For mounting on DIN-rail in accordance with DIN/EN
50 022 (DTA01, DTA02) or plug-in module (PTA01,
PTA02)
• 22.5 mm Euronorm housing (DTA01, DTA02) or
36 mm plug-in module (PTA01, PTA02)
• LED indication for relay and power supply ON (DTA02,
PTA02)
• Galvanically separated power supply
DTA01, DTA02
PTA01, PTA02
•
•
•
•
•
Product Description
DTA01, DTA02, PTA01 and
PTA02 are precise thermistor
monitoring relays.
They can be used to monitor
the temperature of the coils of
a motor with built-in PTC’s.
The alarm status of the relay
can be reset by either an
external contact or an internal
button (DTA02, PTA02).
The test button allows the
simulation of the fault condi-
tion (DTA02, PTA02).
The red LED indicates the
alarm status.
Ordering Key
Housing
Function
Type
Item number
Output
Power supply
DTA 01 C 230
Type Selection
Mounting
DIN-rail
Plug-in
DIN-rail
Plug-in
Output
SPST
SPDT
SPDT
SPDT
Supply: 24 VDC
DTA 01 C 724
PTA 01 C 724
DTA 02 C 724
PTA 02 C 724
Supply: 24 VAC
DTA 01 C 024
PTA 01 C 024
DTA 02 C 024
PTA 02 C 024
Supply: 115 VAC
DTA 01 C 115
PTA 01 C 115
DTA 02 C 115
PTA 02 C 115
Supply: 230 VAC
DTA 01 C 230
PTA 01 C 230
DTA 02 C 230
PTA 02 C 230
Input Specifications
DTA01, DTA02:
PTA01, PTA02:
Measuring ranges
Max cold PTC resistance
Alarm setpoint
Return setpoint
Short-circuit detection
Measurement voltage
Contact input
DTA02
PTA02
Disabled
Enabled
Alarm reset
Input
(PTC)
Terminals T1, T2
Terminals 5, 6
1500
Ω
3100
Ω
± 10%
1650
Ω
± 10%
0 to 10
Ω
≤2.5V
(acc. to IEC 60034-11)
Terminals Z1, Z2
Terminals 8, 9
> 10 kΩ
< 500
Ω
> 500 ms
Output Specifications
Output
Rated insulation voltage
Contact ratings
(AgSnO
2
)
Resistive loads
AC 1
DC 12
Small inductive loads AC 15
DC 13
Mechanical life
Electrical life
SPST or SPDT relay
250 VAC
µ
8 A @ 250 VAC
5 A @ 24 VDC
2.5 A @ 250 VAC
2.5 A @ 24 VDC
≥
30 x 10
6
operations
≥
10
5
operations
(at 8 A, 250 V, cos
ϕ
= 1)
≤
7200 operations/h
Operating frequency
Dielectric strength
≥
2 kVAC (rms)
Dielectric voltage
Rated impulse withstand volt. 4 kV (1.2/50 µs)
Specifications are subject to change without notice (01.12.04)
1
DTA01, DTA02, PTA01, PTA02
Supply Specifications
Power supply
Rated operational voltage
through terminals:
A1, A2
(DTA01, DTA02)
2, 10
(PTA01, PTA02)
724:
024:
115:
230:
Dielectric voltage
(1.2/50 µs)
Supply to input
Supply to output
Input to output
Rated operational power
AC
DC
Overvoltage cat. III
(IEC 60664, IEC 60038)
General Specifications
Reaction time
Alarm ON delay
Reset delay
< 150 ms
(resistance rising from
-20% to +20% set value)
< 500 ms
(resistance decreasing from
+20% to -20% set value)
(15 min warm-up time)
± 1000 ppm/°C
± 0.5% on full-scale
LED, green
LED, yellow
(EN 60529)
IP 20
3 (DTA01, DTA02),
2 (PTA01, PTA02)
-20 to 60°C, R.H. < 95%
-30 to 80°C, R.H. < 95%
22.5 x 80 x 99.5 mm
36 x 80 x 87 mm
Approx. 150g
Max. 0.5 Nm
acc. to IEC 60947
UL, CSA
Yes
Electromagnetic Compatibillity
According to EN 61000-6-2
According to EN 50081-1
24 VDC ± 20%, insulated
24 VAC ± 15%
45 to 65 Hz, insulated
115 VAC ± 15%
45 to 65 Hz, insulated
230 VAC ± 15%
45 to 65 Hz, insulated
DC supply
AC supply
2 kV
4 kV
4 kV
4 kV
4 kV
4 kV
2.5VA
1.5W
Accuracy
Temperature drift
Repeatability
Indication for
Power supply ON
Relay ON
Environment
Degree of protection
Pollution degree
Operating temperature
Storage temperature
Housing dimensions
DIN-rail version
Plug-in version
Weight
Screw terminals
Tightening torque
Approvals
CE Marking
EMC
Immunity
Emission
Mode of Operation
DTA01, DTA02, PTA01 and
PTA02 monitor the resis-
tance value of the PTC
resistors connected to the
terminals T1 and T2 (or 5
and 6). This value is related
with their temperature (often
the three coils of a motor) so
to offer a prompt reaction to
over temperature.
Example 1 - DTA01 or PTA01
The relay operates as long
as the measured resistance
is below the rated value. The
relay releases if the mea-
sured resistance (i.e. the
temperature of the motor
coils) exceeds the rated val-
ue.
Example 2 - DTA02 or PTA02
The relay operates and the
yellow LED is ON as long as
the measured resistance is
below the rated value. The
relay releases and the yellow
LED is OFF if the measured
resistance (i.e. the tempera-
ture of the motor coils)
exceeds the rated value.
Provided that the resistance
has dropped below the rat-
ed value (i.e. the tempera-
ture of the motor coils has
returned cold), the relay
operates when the intercon-
nection between terminals
Z1, Z2 or 8, 9 is interrupted
or the reset button on the
front of the unit is pressed.
Wiring Diagrams
L
A1
T1
T2
m
µ
14
7
A2
N (-)
11
5
L
2
4
µ
m
3
T
T
10
N (-)
1
DTA01
PTA01
2
Specifications are subject to change without notice (01.12.04)
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