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PDF VTT11 Data sheet ( Hoja de datos )
| Número de pieza | VTT11 | |
| Descripción | Definite Time Delay Relay | |
| Fabricantes | ALSTOM | |
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PROTECTION
Type VTT 11, 12
Definite Time Delay Relay
VTT is a static time delay relay which is particularly suitable for applications
requiring large number of operations and consistent accuracy with little or
no maintenance over long periods. It is also commonly used in industrial
processes.
Features
• Consistent accuracy
• Reliability
• Low burden
• Reduced maintenance
• Immunity to transients and surges;
withstands 5 kv impulse voltage test
• Relays with heavy-duty magnetic
blow-out contacts also available
Description
A stabilised voltage is applied to a
resistance/capacitance circuit. The
potential developed across the capacitor
is applied to a transistor switching circuit
which, in turn, operates an attracted
armature relay when the potential
reaches the trigger level.
The time delay is varied by altering
the resistance value in the resistance/
capacitance circuit by a potentiometer
calibrated in seconds. A circuit is
incorporated to protect the transistors
from damage due to high peak transients
in the supply voltage. A diode is also fitted
in the circuitry to take care of inadvertent
connection of supply with reversed
polarity.
Type VTT 11 units have a delayed pick-
up, i.e., timing is started by closing an
initiating contact and the output relay is
energised at the end of the set time. The
unit resets when the initiating contact is
reopened.
Type VTT 12 units have a delayed drop-
off, i.e., the output relay is normally
energised. Timing is started by opening
an initiating contact and the output
relay is deenergised at the end of the set
time. The unit resets when the initiating
contact is reclosed.
Technical data
Voltage ratings
DC supply
30, 48, 110 or 220V. Satisfactory
operation is maintained between 70% and
130% of rated voltage.
Units for use on 110 or 220V are supplied
with a suitable external resistor.
AC supply
110, 240 or 415V at 50 Hz. Relays
suitable for operation from ac supply
have a built-in power pack. Satisfactory
operation is maintained between 80% and
115% of rated voltage.
Timing ranges
Models with the following setting ranges
(in seconds) - continuously adjustable -
are available:
0.05 - 0.5
0.10 - 1.0
0.50 - 5.0
1.00 - 10.0
2.50 - 25.0
Accuracy
Within ±5% of setting or ±10 milliseconds
whichever is greater, at nominal voltage
and at an ambient temperature within
the range of 10ºC and 30ºC.
Within ±5% of setting or ±25 milliseconds
whichever is greater for supply voltage
variation for ±30%. Operating temperature
range -5ºC to +50ºC.
Customer Benefits
• Accurate and Reliable
• Adjustable time delay
• Heavy duty magnetic blow
out contacts on request
GRID
1
1 page  
Type VTT 11, 12
Contact Ratings
Make and carry continuously
Make and carry for 0.5 second
Break
AC 1250 VA with maxima of 5A and 660V 7500 VA with maxima of 30A and 660V 1250VA with maxima of 5A and 660V
DC 1250 W with maxima of 5A and 660V 7500 W with maxima of 30A and 660V 100W (resistive) 50W (inductive)
maxima of 5A and 660V
Information required with order
1. Relay type (delay on pick-up or delay on drop-off)
2. Timing range
3. Voltage rating
4. Contact combination
5. Case
Figure 2 : Case and panel cut-out dimensions for case 1/2N (all dimensions in mm)
Figure 3 : Case and panel cut-out dimensions for case 1D (all dimensions in mm)
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet VTT11.PDF ] | |
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