Seneca S91 User manual

INSTALLATION MANUAL
S91 / S91-400
Multi-protection relay for motors
SENECA s.r.l.
Via Austria, 26 – 35127 – PADOVA – ITALY
Tel. +39.049.8705355 - 8705359 - Fax +39.049.8706287
For manuals in other languages, conguration software and accessories,
visit www.seneca.it/products/s91
EN
MI00536-5-EN 1/8

MODULE LAYOUT
Dimensions LxHxD 53.5 x 73 x 90 mm; Weight: 250 g; Enclosure: UL94 VO, colour ral 7035
PRELIMINARY WARNINGS
The word WARNING preceded by the symbol indicates conditions or actions that put the user's safety at
risk. The word ATTENTION preceded by the symbol indicates conditions or actions that might damage the
instrument or the connected equipment.
The warranty shall become null and void in the event of improper use or tampering with the module or devices
supplied by the manufacturer as necessary for its correct operation, and if the instructions contained in this
manual are not followed.
WARNING: The full content of this manual must be read before any operation.
The module must only be used by qualied electricians.
Specic documentation is available at www.seneca.it/products/s91
Electrical and electronic waste disposal (applicable in the European Union and other countries with recycling).
The symbol on the product or its packaging shows the product must be surrendered to a collection centre
authorized to recycle electrical and electronic waste.
The module must be repaired and damaged parts replaced by the Manufacturer.
The product is sensitive to electrostatic discharges. Take appropriate measures during any operation.
LED STATUS LED meaning
OUT (Red) On Energized relay
Off De-energized relay
SIGNALS VIA LED ON FRONT PANEL
2/8
FRONT DISPLAY
Display Meaning Display Meaning
-Device disabled UPhase failure or minimum voltage alarm
OInhibition time (slow rotation) SPhase sequence alarm
OMotor rotating (fast rotation) AOvercurrent alarm
LPTC sensor line short circuited PMinimum P.F. alarm
HPTC sensor line interrupted tTemperature alarm

TECHNICAL SPECIFICATIONS
STANDARDS
EN61000-6-4 Electromagnetic emissions, industrial environment.
EN61000-6-2 Electromagnetic immunity, industrial environment.
EN61010-1 Safety
INSULATION
ENVIRONMENTAL
CONDITIONS
Temperature: -20 – + 65°C
Humidity: 30%– 90% non condensing.
Storage temperature: -20 + 85°
Protection rating: IP20
ASSEMBLY IEC EN60715, 35mm DIN rail in vertical position.
CONNECTIONS Screw terminals, 7.5 mm pitch, cable with <2.5 mm2 section, 0.5 Nm tightening torque
POWER SUPPLY
Rated voltage: 195 ÷ 255 Vac (S91) / 400 Vac ± 10 % (S91-400)
Rated frequency: 50 - 60 Hz ± 5%
Maximum absorbed power: 1.5 W
CURRENT
MEASUREMENT
Type of insertion: Direct or through an Ammeter Transformer
Rated operational current (le): 16 Aac
Current measurement limits: 0.1 ÷ 16 Aac, measurement precision < 5%
Input type: Shunt
Type of measurement: TRMS
Continuous thermal limit: 16 Aac
Impulsive thermal limit: 45 Aac for 1 sec
Dynamic limit: 200 Aac for 10 msec
Self-consumption: 1.3 W
Phase failure intervention: < 200 msec
VOLTAGE
MEASUREMENT
Rated UE voltage 347 (L-N) / 600 (L-L) Vac Cat Ⅱ; 277 (L-N) / 480 (L-L) Vac Cat Ⅲ
Voltage measurement limits: 60 ÷ 660 Vac, measurement precision < 5%
Frequency limits: 50 – 60 Hz ± 5%
Connection methods: L1-L2-L3 or L-N
No voltage intervention threshold: 80 Vac (single- and three-phase)
Only for three-phase: the difference between max. phase and min. phase compared to the middle phase is > 20%
MOTOR
CONTROL
INPUT
Rated voltage: 195 ÷ 255 Vac (S91) / 400 Vac ± 10 % (S91-400)
Operating limits: 0.85 ÷ 1.1 of rated voltage
Absorbed/dissipated power: 0.17 W
Minimum command duration: ≥40 ms
RELAY
OUTPUT
Type of output: 1 exchange
Working voltage: 400 Vac
Working current: 8 A
PTC
MEASUREMENT
Input not isolated from the mains, maximum cable length 30 m
Precision: range 1650 ÷ 3100 Ω; error < 5%
Short circuit detection: < 30Ω ± 5Ω
Open circuit detection: > 14 KΩ ± 0,2 KΩ
3/8
POWER
SUPPLY
4 kV
A2
A1
E
L2
L1
L3
COMMAND
P1
T1
P2
Nc
C
No
RELAY
OUTPUT
MOTOR
CONNECTIONS
Withstand voltage: 2.5 kV
Impulse withstand voltage: 4 kV
Rated insulation voltage: 300 V (Cat Ⅲ)
600 V (Cat Ⅱ)
Pollution rating 2

GENERAL DESCRIPTION
Protection device for electric motors capable of detecting the wrong sequence of phases, the lack of a phase, the
excess of absorbed current and the no-load operation with the measurement of the power factor.
It is also equipped with a PTC input for the protection of the motor from over temperature and an enabling input to
start the motor.
The main use is the protection of single-phase or three-phase pumps, protecting them against dry running,
possible rotor blockage and over temperature (if equipped with PTC).
It is also suitable for detecting the breakage of mechanical transmission devices, for example belts or chains and
to protect against transmission system block.
The following operating modes can be set using the panel selector:
• single-phase or three-phase measurement
• maximum current range 5 or 16 A
• operation with or without PTC
4/8
FRONT SELECTOR CONFIGURATION
SELECTOR PARAMETER DESCRIPTION
MODE
Type of operation
ATTENTION: This selector
must be set with the device off
because it is only read when the
device is switched on.
Mode Selected function Mode Selected function
1
Single phase 5A without temperature control
5
Single phase 16A without temperature control
2
Single phase 5A with PTC motor control
6
Single phase 16A with PTC motor control
3
Three phase 5A without temperature control
7
Three phase 16A without temperature control
4
Three phase 5A with PTC motor control
8
Three phase 16A with PTC motor control
FRONT TRIMMER ADJUSTMENT
TRIMMER PARAMETER RANGE DESCRIPTION
AR
Autoreset
time
0 = disabled
1 ÷ 100 min
Setting the Auto Restart time in minutes.
If automatic restart is not desired, set to 0.
TD
Inhibition
time 1 ÷ 30 sec
Setting the inhibition time in seconds.
Disables the IMAX% (overcurrent) and PF (power factor lower than
minimum) alarms during engine start.
PF
Minimum power
factor 0 ÷ 1 Threshold value below which the minimum Power Factor alarm is
generated. (low load operation).
OT
Intervention
time 0.2 ÷ 10 sec
Setting the attack time in seconds, indicates how long the
IMAX% measurement can exceed the set threshold or how long the
P.F. can drop below the minimum set value.
I
MAX%
Maximum
current:
0% ÷ 100%
of full scale
Setting in percentage. Threshold value that, when exceeded, triggers
the overcurrent alarm.

ALARM DISPLAY
5/8
ENABLE INPUT
The device is equipped with an enable input that allows you to activate/deactivate the motor.
During the rst start-up or if there are no alarms, the absence of the enable signal causes the "-" symbol to appear on the
display and the motor control relay to de-energize.
In normal conditions, when enabled, a segment is turned on on the display which rotates along the "0" and the command
relay is energized to activate the motor.
On power-up, the rotation speed with which the segment lights up is low: this indicates that the motor is starting up for the
set DT inhibition time (IMax and PFmin are not measured).
In the following phase, the segment rotates at a higher speed: this indicates that the motor is operating normally and that
the alarm control is again active.
If the enable signal is removed after the appearance of any alarm, the latter signal remains xed on the display. When the
enable signal returns, the alarm is cancelled and the control relay is energized to restart the motor.
Alarm messages are shown on the display in two different ways with the following meaning:
1 - Alarm with ashing display:
indicates that the device will attempt to restore operation at the end of the AR autoreset
time.
This mode is active only if the AR autoreset time is greater than zero.
2 - Alarm with xed display:
Autoreset disabled, no automatic restart or reset.
An external action by an operator is required to restart.
Possible actions: Turn the device off and on again or deactivate and reactivate the enabling input.
TEMPERATURE ALARM THROUGH PTC
This function involves the use of a thermistor housed near the windings of the motor connected to terminals P1 and P2 of
the device.
The intervention temperature depends on the type of PTC installed in the motor;
The over-temperature alarm is signalled with the symbol t on the display, moreover the device also checks for the presence
of a short circuit on terminals P1 and P2 (Alarm L on the display) or the interruption of the connection with the sensor
(Alarm H on the display ). This alarm is automatically reset if the temperature drops below the set threshold if the AR
autoreset time is greater than zero.
WARNING:
The PTC input is not isolated from the line that powers the motor: use the necessary precautions to prevent
an electric shock.
If you do not want to use this protection, you must set the MODE selector appropriately before
turning on the device.
MAXIMUM CURRENT ALARM
This function involves selecting a current scale between 5A and 16A using the MODE selector before switching on the
device. The over-current alarm is signalled with the symbol A on the display when the current absorbed by the motor
exceeds the percentage threshold set on the device. This alarm is automatically reset when the current drops below the set
threshold if the AR
autoreset time is greater than zero.
During the autoreset time the symbol A ashes and at the end the motor restarts.
N.B.: During normal operation, when the set IMax threshold is exceeded, the symbol A alternates with the symbol O during
the set OT trip time.
POWER FACTOR ALARM
This function has a threshold adjustable between 0 and 1. The power factor alarm is signalled with the symbol P on the
display when the Power Factor drops below the minimum threshold set on the device. This alarm is automatically reset
when the Power Factor returns or exceeds the set threshold if the AR autoreset time is greater than zero. During the
autoreset time the P symbol ashes and at the end the motor starts.
N.B.: During normal operation, when the set PFmin threshold is exceeded, the symbol A alternates with the symbol O
during the set OT trip time.

6/8
MINIMUM VOLTAGE OR PHASE FAILURE ALARM
This function involves selecting the type of operation between three-phase and single-phase using the MODE selector before
turning on the device. The alarm highlighting that the voltage is below the minimum threshold or a phase is failing is shown by
the U symbol on the display. The thresholds of this alarm are internally preset and cannot be changed by the user.
The intervention of this alarm is immediate (detection time <200ms) and can be automatically reset if the AR autoreset time is
greater than zero. In this case, the U symbol ashes on the display for the entire set autoreset time and then the device tries to
restart the motor.
ELECTRICAL CONNECTIONS
TERMINAL BLOCK LAYOUT TERMINAL DESCRIPTION
P1 = Motor protection input (PTC) *
P2 = Motor protection input (PTC) *
T1 = L1 output
L1 = Line 1 input
L2 = Line 2 input
L3 = Line 3 input
A2 = Auxiliary power 230 Vac / 400 Vac
A1 = Auxiliary power 230 Vac / 400 Vac
E= Motor control input
Nc = Normally closed contact relay
C = Contact common relay
No = Normally open contact relay
(*) WARNING: input not isolated from the mains
THREE-PHASE MOTOR WITH
DIRECT CURRENT MEASUREMENT
THREE-PHASE MOTOR WITH CURRENT
MEASUREMENT WITH AMMETER TRANSFORMER
SINGLE-PHASE MOTOR WITH
DIRECT CURRENT MEASUREMENT
SINGLE-PHASE MOTOR WITH CURRENT
MEASUREMENT WITH AMMETER TRANSFORMER
NB: it is always
necessary to install
a suitable protection
upstream
*A thermal magnetic switch must be inserted near the device
* *
* *
+t°
L
1
L
2
L
3
T
1
P
1
P
2
CN
O
N
C
EA
1
A
2
L1
L2
L3
S91
K1M
M
S91
M
N / L2
L / L1
A2 A1
ON /
OFF
K1M
+t°
PTC
230 Vac (S91)
400 Vac (S91-400)
S91
K1M
M
L1
L2
L3
S91
M
N / L2
L / L1
A2 A1
ON /
OFF
+t°
PTC
K1M
230 Vac (S91)
400 Vac (S91-400)
S91
K1M
S91
M
A2 A1
ON/
OFF
+t°
PTC
N
L
K1M
N / L2
L / L1
230 Vac (S91)
400 Vac (S91-400)
S91
K1M
S91
A2 A1
ON/
OFF
+t°
PTC
M
N
L
K1M
N / L2
L / L1
230 Vac (S91)
400 Vac (S91-400)

7/8
PTC AND VOLTAGE OPERATING DIAGRAM
Power supply
Abilita�on
Display
Voltage
Output
(blink)
0V
PTC
3100 Ω
0 Ω
1650 Ω
V
I N T
Slow /
Fast
tAR>o
Slow /
Fast
Slow /
Fast
Slow /
Fast
Slow /
Fast
Slow /
Fast
(blink)
Volt.
Alarm
tAR
Manual
Dis. / En.
Volt.
Alarm
Temp.
Alarm
Temp.
Alarm
Auto
Restart
Auto
Restart
Manual
Dis./En.
t
AR
=o
Manual
Dis./En.
t
AR
>o

CONTACT INFORMATION
This document is the property of SENECA srl. Copies and reproduction are prohibited unless authorised.
The content of this document corresponds to the described products and technologies.
Stated data may be modied or supplemented for technical and/or sales purposes.
8/8
CURRENT AND PF (POWER FACTOR) OPERATING DIAGRAM
Power Supply
Device Enable
Display
Current
PF
Output
(slow)
(fast)
(fast)
(blink)
(slow)
(blink)
(slow)
(fast)
(slow)
(fast)
I
SET
PF
SET
Se�ng
t
AR
> OFF t
DT
t
OT
Current
Alarm
t
AR
Auto
Restart
t
DT
PF
Alarm
Manual
Dis./ En.
t
AR
= 0
Start
t
DT
t
OT
Manual
Dis. / En.
Current
Alarm
Manual
Dis. / En.
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