ES-1603 Rev.15

AS4CT

Plug-in Signal Conditioners M-UNIT

CT ALARM

(dual or quad alarm trip; field-configurable)
Functions & Features
• Provides relay outputs at preset AC current levels from a CT (current transformer)
• True RMS sensing
• Quad or dual trip
• Setting and display in engineering unit values
• Setpoint adjustments with the front keypad
• Software lock
• Adjustable hysteresis (deadband)
• On-delay timer
• Hi/Lo trip and energized/de-energized coil independently selectable for each setpoint
• Enclosed relays
• Relays can be powered by 200 V AC and 100 V DC
• High-density mounting on DIN rail
Typical Applications
• Annunciator
• Various alarm applications
 

MODEL: AS4CT–[1][2]–[3][4]

ORDERING INFORMATION

• Code number: AS4CT-[1][2]-[3][4]
Specify a code from below for each of [1] through [4].
  (e.g. AS4CT-S52-R/Q)
• Specify the specification for option code /Q
  (e.g. /C01/S01/SET)

[1] INPUT

Current
S1: 0 – 1 A AC
S5: 0 – 5 A AC

[2] OUTPUT

2: 4 points; N.O. or make contact
3: 4 points; N.C. or break contact
5: 2 points; SPDT or transfer contact

[3] POWER INPUT

AC Power
M2: 100 – 240 V AC (Operational voltage range 85 – 264 V,
 47 – 66 Hz)
DC Power
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)
P: 110 V DC
(Operational voltage range 85 – 150 V, ripple 10 %p-p max.)

[4] OPTIONS

blank: none
/Q: With options (specify the specification)

SPECIFICATIONS OF OPTION: Q (multiple selections)

COATING (For the detail, refer to our web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating
TERMINAL SCREW MATERIAL
/S01: Stainless steel
EX-FACTORY SETTING
/SET: Preset according to the Ordering Information Sheet
 (No. ESU-1603)

GENERAL SPECIFICATIONS

Construction: Plug-in
Connection: M3.5 screw terminals
Screw terminal: Chromated steel (standard) or stainless steel
Housing material: Flame-resistant resin (black)
Isolation: Input to output to power
Input waveform: Up to 15 % of 3rd harmonic content
Sampling cycle: 100 msec.
User-configurable items: Front key pad
• Alarm setpoint
• Display range scaling
• Power ON-delay time
• Alarm ON-delay time
• Moving average
• Hi/Lo trip operation
• Coil at alarm
• Hysteresis (deadband)
• 0 %, 100 % input voltage/current
• Others
(Refer to the instruction manual)
■ DISPLAY
LED: 8 mm (.31”) 7 segment, red
Number of display digits: 4 digits for DATA display; 2 digits for ITEM display
Range: -1999 to 9999
(decimal point position selectable)
PV indication: Input signal in engineering unit
Overrange indication: LEDs blinking
Power saving mode: Displays turn off if the keys are untouched for a preset time period
LEDs: Red LEDs turn on when coils are energized.
(L1 and L2 for 2-point alarm.  L1, L2, L3 and L4 for 4-point alarm.)

INPUT SPECIFICATIONS

Operational range: 0 – 115 % of rating
S1: 0 – 1 A
S5: 0 – 5 A
Note: If an overload exceeding the operational range is detected due to fluctuations within the sampling cycle (100 msec.) from an input state below the alarm setpoint (upper limit), processing stops and no alarm (upper limit) is output.
Frequency: 50 or 60 Hz
Input burden: 0.1 VA (input 0 – 1 A)
  0.5 VA (input 0 – 5 A)
Overload capacity: 1000 % of rating for 3 sec.,
200 % for 10 sec., 120 % continuous
Minimum increment
S1: 0.01 A
S5: 0.01 A
Default setting
S1: 0 – 1 A
S5: 0 – 5 A

OUTPUT SPECIFICATIONS

Relay rating:
120 V AC @ 1 A (cos ø = 1)
240 V AC @ 0.5 A (cos ø = 1)
30 V DC @ 1 A (resistive load)
(Limited within 0.5 A to conform with EU Directive)
Maximum switching voltage: 380 V AC or 125 V DC
Maximum switching power: 120 VA or 30 W
Minimum load: 5 V DC @ 10 mA
Mechanical life: 5 × 107 cycles

INSTALLATION

Power consumption
•AC:
 Approx. 4.6 VA at 100 V
 Approx. 5.9 VA at 200 V
 Approx. 6.8 VA at 264 V
•DC: Approx. 3.5 W
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 500 g (1.1 lb)

PERFORMANCE in percentage of FS input

Setpoint accuracy (trip point accuracy): ±(0.3 % of FS + 1 digit)
Display accuracy: ±(0.3 % of FS + 1 digit)
Temp. coefficient: ±0.015 %/°C (±0.008 %/°F)
Response time: ≤ 0.7 sec. (0 – 100 % at 90 % setpoint)
Line voltage effect: ±0.1 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 2000 V AC @1 minute  (input to output to power to ground)

STANDARDS & APPROVALS

EU conformity:
EMC Directive 
  EMI EN 61000-6-4
  EMS EN 61000-6-2
Low Voltage Directive 
  EN 61010-1
  Measurement Category II (output)
  Installation Category II (power)
  Pollution Degree 2
  Input to output to power: Basic insulation (300 V)
RoHS Directive

EXTERNAL VIEW

Refer to the instruction manual for detailed procedures.

EXTERNAL DIMENSIONS unit: mm [inch]

TERMINAL ASSIGNMENTS unit: mm [inch]

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM