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HomeProducts Controllers Zesta Controllers ZEL-C21

ZEL-C21

50mm X 26mm
Zesta ZEL-C21
Zesta ZEL-C21
The Fuzzy Logic plus PID microprocessor-based controller series, incorporates a bright, easy to read 4-digit LED display, indicating the process value or the set point value. The Fuzzy Logic technology enables the process to reach a predetermined set point in the shortest time, with minimum overshoot during power-up or an external load disturbance.
 
The ZEL-C21 is a 1/32 DIN size panel mount controller. The ZEL-C91 is a 1/16 DIN size panel mount controller. These units are powered by 11-26 VAC/VDC or 90-250 VAC supply. The base model incorporates a 2-amp control relay output as a standard. The second output may be configured as a cooling control or as an alarm. Both outputs can select AC triac, 5 VDC logic, linear current or linear voltage to drive an external device. There are six types of alarms, plus a dwell timer that may be configured for a second output. The units are fully programmable for PT100 DIN as well as thermocouple types J, K, T, E, B, R, S, N and L. The input signal is digitized using an 18-bit A to D converter. The high-speed sampling rate of the A to D converter allows precise control of rapidly changing processes.
 
Digital communications such as RS-485 or RS-232 (for ZEL-C21) are available as an additional option. The digital communication feature allows the units to be interfaced with supervisory control systems and software. A programming port is available for automatic configuration, calibration and testing without the need to access the control via the front keypad directly.
 
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Features
Specifications
Ordering information
Resources
Applications

Product Features

  •  Easy-to-use
  • Fuzzy modified PID heat & cool control
  • Fast A-D sampling rate (5 times/sec)
  • Universal input (PT100 & thermocouple) with high accuracy 18-bit A-D
  • Analog output (linear current or voltage) uses high accuracy 15-bit D-A
  • RS-485 or RS-232 interface
  • Programming port provided on board
  • Supports manual control & auto-tune function
  • Wide variety of programmable alarm modes
  • Operator lockout protection
  • Bumpless transfer feature
  • Soft-start ramp and dwell timer
  • Bright display stabilized with digital filter
  • Front panel sealed to NEMA 4X & IP65 (for ZEL-C21)
  • UL/CSA/CE approval
  • High performance with low cost

Product Specifications

Power:
  • 90-250 VAC, 47-63 Hz, 10 VA, 5 W maximum
  • 11-26 VAC / VDC, 10 VA, 5 W maximum
Signal Input:
  • Resolution: 18-bits
  • Sampling Rate: 5 times / second
  • Maximum Rating: -2 VDC minimum, 12 VDC maximum (1 minute for mA input)
  • Temperature Effect: +/- 1.5 uV/°C for all inputs except mA input +/- 3.0 uV/°C for mA input
  • Sensor Break Detection: Sensor open for TC, RTD and mV inputs, Sensor short for RTD input, below 1 mA for 4-20 mA input, below 0.25 V for 1 - 5 V input, unavailable for other inputs.
Output 1 / Output 2:
  • Relay Rating: 2 A/240 VAC, 200,000 cycles for resistive load.
  • Pulsed Voltage: Source Voltage 5 V, current limiting resistance 66Ω
Triac (SSR) Output:
Rating: 1 A / 240 VAC
Alarm/Output 2:
  • Alarm Relay: Form A, Max. rating 2 A/240 VAC, 200,000 cycles for resistive load.
  • Alarm Functions: Dwell timer, Deviation High / Low Alarm, Deviation Band High / Low Alarm, Process High / Low Alarm.
  • Alarm Mode: Normal, Latching, Hold, Latching / Hold.
  • Dwell Timer: 0.1 - 4553.6 minutes
Data Communication:
  • Interface: RS-232 (1 unit), RS-485 (up to 247 units)
  • Protocol: Modbus Protocol RTU mode
Analog Retransmission:
  • Output Signal: 4-20 mA, 0-20 mA, 0-5 V, 1-5 V, 0-10 V
  • Resolution: 15-bits
  • Accuracy: +/-0.05% of span +/-0.0025%/°C
  • Load Resistance: 0-500 ohms (for current output) 10 K ohms minimum (for voltage output)
  • Output Regulation: 0.01% for full load change
User Interface:
  • Programming Port: For automatic setup, calibration and testing
  • Communication Port: Connection to PC for supervisory control
Control Mode:
  • Output 1: Reverse (heating) or direct (cooling) action
  • Output 2: PID cooling control, cooling P band 50 ~ 300% of PB, dead band -36.0 ~ 36.0% of PB
  • ON-OFF: 0.1 - 90.0 (°F) hysteresis control (P band = 0)
  • P or PD: 0 - 100.0% offset adjustment
  • PID: Fuzzy logic modified
  • Proportional band 0.1 ~ 900.0°F.
  • Intergral time 0 - 1000 seconds
  • Derivative time 0 - 360.0 seconds
  • Cycle Time: 0.1 - 90.0 seconds
  • Manual Control: Heat (MV1) and cool (MV2)
  • Auto-tuning: Cold start and warm start
  • Failure Mode: Auto-transfer to manual mode when sensor breaks or A-D converter damage
  • Ramping Control: 0 - 900.0°F/minute or 0 - 900.0°F/hour ramp rate
Digital Filter:
  • Function: PV dampening
  • Time Constant: 0, 0.2, 0.5, 1, 2, 5, 10, 20, 30, 60 seconds programmable
Environmental:
  • Operating Temperature: -10°C to 50°C
  • Storage Temperature: -40°C to 60°C
  • Humidity: 0 to 90% RH (non-condensing)
  • Altitude: 2000 m maximum
  • Pollution: Degree 2
  • Insulation Resistance: 20 M ohms min. (at 500 VDC)
  • Dielectric Strength: 2000 VAC, 50/60 Hz for 1 minute
  • Vibration Resistance: 10 - 55 Hz, 10 m/s2 for 2 hours
  • Shock Resistance: 200 m/s2 (20 g)
  • Molding: Flame retardant polycarbonate
Dimensions:
  • ZEL-C21 ---50 mm(W) X 26.5 mm(H) X 110.5 mm(D), 98 mm depth behind panel
  • ZEL-C91 ---48 mm(W) X 48 mm(H) X 94 mm(D), 86 mm depth behind panel
Approval Standards:
  • Safety: UL61010C-1 CSA C22.2 No. 24-93 EN61010-1 (IEC1010-1)
  • Protective Class: NEMA 4X & (IP65) front panel for ZEL-C21, IP30 front panel for ZEL-C91, IP20 housing & terminals with protective cover. All indoor use.
  • EMC: EN61326