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Электронный компонент: S1721156400

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Specifications are subject to change without notice
1
Current and Voltage Controls
Product Description
3-phase and neutral moni-
toring plug-in relay for sepa-
rate upper and lower voltage
control. Often used to control
all 3 phases and neutral where
the supplied electrical power
Ordering Key
Housing
Type
Output
Power supply
Monitoring relay for 3-phase upper/lower
phase-phase neutral voltage control
Measures if all 3 phase-neutral voltages are
within set limits
Measures on own power supply
Operates irrespective of phase sequence
Upper and lower limits separately adjustable
Built-in adjustable timer function
Output: 10 A SPDT relay
Plug-in type module
S-housing
LED-indication for power supply and output ON
Power supply is the 3-phase + N measuring voltage
is unstable or varies in value
in order to monitor that the
attached motors are perfor-
ming as required. The S 1721
features built-in time delay.
Input Specifications
Input
Pins 5, 6 & 7
Arbitrary phase sequence
Pin 11
Neutral
Measuring ranges (VAC)
Power supply (phase-phase)
3x220 +N 3x380 +N 3x400+N
18%
18%
18%
Range (phase-neutral)
104-150 180-260 188-271
Upper level
130-150 225-260 235-271
Scale
102-118% 102-118% 102-118%
Lower level
104-124 180-215 188-225
Scale
82-98% 82-98% 82-98%
Power supply (phase-phase)
3x415+N
18%
Range (phase-neutral)
204-276
Upper level
252-276
Scale
102-118%
Lower level
204-228
Scale
82-98%
measures value of own
supply. Range equals rms
value of a sinusoidal voltage
Output
SPDT relay
Rated insulation voltage
250 VAC (rms)
(cont./elect.)
Contact ratings (AgCdO)
(micro gap)
Resistive loads
AC 1
10 A/250 VAC (2500 VA)
DC 1
1 A/250 VDC (250 W)
or
10 A/25 VDC (250 W)
Small inductive loads AC 15
2.5 A/230 VAC
DC 13
5 A/24 VDC
Mechanical life
30 x 10
6
operations
Electrical life
AC 1
2.5 x 10
5
operations
(at max. load)
Operating frequency
7200 operations/h
Dielectric strength
Dielectric voltage
2 kVAC (rms) (cont./elect.)
Rated impulse withstand volt.
4 kV (1.2/50 s) (cont./elect.)
(IEC 60664)
Type Selection
Plug
Output
Timer
Supply: 220 VAC
Supply: 380 VAC
Supply: 400 VAC
Supply: 415 VAC
Circular
SPDT
Yes
S 1721 156 220
S 1721 156 380
S 1721 156 400
S 1721 156 415
Circular
SPDT
No
SYY 155 220
SYY 155 380
SYY 155 415
3 Phase-neutral Max. and Min. Voltage Control
Types S 1721, SYY 155
Output Specifications
S 1721 156 220
2
Specifications are subject to change without notice
Sockets
S 411
Hold down spring
HF
Mounting rack
SM 13
Socket covers
BB 4
Front mounting bezel
FRS 2
Potentiometer lock
PL 2
For further information refer to "Accessories".
Accessories
Time/Range Setting
Range setting
Upper potentiometer:
Adjustment of upper limit in
percent.
Middle potentiometer:
Adjustment of lower limit in
percent.
Hysteresis
1-3% of rms-value
Time setting
Bottom potentiometer:
Time setting on relative scale
(not SYY 155).
Time
Adjustable delay on release:
0.2 to 10 s
S 1721, SYY 155
Reaction time
= 2 s, worst case reaction
time may be up to 5 x
Adjustable delay on release
built-in (0.2s - 10s)
Note:
Reaction time + set time =
real delay on release time
Accuracy
OFF delay
10s, -1/+3 s on max.
< 0.1 s on min.
Time function
Delay on release 0.2-10 s. adj.
Indication for
Power supply ON
LED, green
Output ON
LED, red
Environment
(IEC 60947-1)
Degree of protection
IP 20 B (IEC 60529)
Pollution degree
(IEC 60664)
1: S 1721 380/400/415
SYY 155 380/415
2: S 1721 220, SYY 155 220
Operating temperature
-20 to +50C (-4 to +122F)
Storage temperature
-50 to +85C (-58 to +185F)
Weight
200 g
Approvals
UL, CSA
Power supply AC types
Overvoltage cat. III (IEC 60664)
Rated operational voltage
(IEC 60038)
Through pins 5, 6, 7 & 11 220
3 x 220 VAC 18%,
(neutral)
45 to 65 Hz
380
3 x 380 VAC 18%,
45 to 65 Hz
400
3 x 400 VAC 18%,
45 to 65 Hz
415
3 x 415 VAC 18%,
45 to 65 Hz
Voltage interruption
40 ms
Dielectric voltage
None (supply/elect.)
Rated impulse withstand volt.
4 kV (1.2/50 s) (line/neutral,
line/line), direct connection
to electronics
Internal measuring circuit is
connected to pins 5 & 11
Rated operational power
3.5 VA
Mode of Operation
Connected to 3 phases and
neutral, the S 1721 and SYY
155 measure sinusoidal vol-
tages. The phase sequence is
arbitrary.
The relay operates as long as
all 3 phase-neutral voltages
are within the set upper and a
lower limit. The two limits are
set separately.
For S 1721 applies that if one
or more of the phase-neutral
voltages rises above the up-
per limit or drops below the
lower limit, the relay releases
after the set time period
whereas SYY 155 releases
immediately.
The relay operates again
when all 3 phase-neutral vol-
tages are within set limits.
Hysteresis on operate is 2%.
Example 1
Mains monitoring
The relay measures if the 3
phase-neutral voltages are
within the upper and lower
limits. The limits are adjusted
on the two built-in potentio-
meters.
Example 2
Monitoring load supply
The relay can protect loads,
such as heating elements,
against overvoltage and
thereby against increase in
current, which could otherwise
destroy the heating elements.
Undervoltage to ohmic loads
causes insufficient heating
capacity, and this can also be
monitored.
The relay cannot be used for
load monitoring if the load is a
motor, as the regenerated
phase voltage at e.g. fuse
blowing is indefinable and
dependent on the mechani-
cal performance when the
failure occurs.
Supply Specifications
General Specifications
Specifications are subject to change without notice
3
Operation Diagrams
S 1721
Upper limit
Hysteresis
Lower limit
Hysteresis
Relay ON
Phase L1, L2 and L3
SYY 155
Upper limit
Hysteresis
Lower limit
Hysteresis
Relay ON
Phase L1, L2 and L3
S 1721, SYY 155
Wiring Diagrams
S 1721, SYY 155
S 1721, SYY 155
Example 1
Example 2