Raychem HTC-915 Universal Heat Tracing Control System
Product Overview
The Raychem HTC-915 is a comprehensive temperature control system designed for heat tracing applications. It offers advanced features for precise temperature management, system monitoring, and safety, including an optional limiter for enhanced protection.
Specifications
| Feature | Specification |
|---|---|
| Temperature Range Controller | -60°C to 570°C in steps of 1 K |
| Control Algorithms | EMR: Line sensing on/off, proportional ambient SSR: Line sensing on/off, proportional, proportional ambient, power limiting, soft start |
| Switching Accuracy | 1 K |
| Ambient Operating Temperature | -40°C to +50°C |
| Ambient Storage Temperature | -40°C to +85°C |
| Relative Humidity | 0% to 90% Non-condensing |
| Ingress Protection | Housing: IP40, Terminals: IP20 |
| Material | ASA-PC, color: green |
| Flammability Class | VO (UL94) |
| Mounting Method | Panel mounting on 35 mm DIN rail |
| Supply Voltage | CE/EAC: 100 Vac to 250 Vac, ±10%, 50/60 Hz, 0.15 A to 0.06 A CSA: 100 Vac to 277 Vac, 50/60 Hz, 0.15 A |
| Power Consumption | Max 20 VA with limiter connected |
| Control Output (Contactor) | Electromechanical relay rated 3 A/250 Vac, 50/60 Hz |
| Control Output (Solid-state) | 12 VDC, 75 mA max. to drive normally open Solid state relays. |
| Switching Capacity | Depends on the type of switch element used (external). |
| Alarm Output Relay | CE/EAC: Relay contact rated 3 A/250 Vac, 50/60 Hz CSA: Relay contact rated 3A/277Vac, 50/60 Hz |
| Temperature Sensor | 100 Ω platinum Pt 100, 3-wire, α = 0.00385 0/°C. Extendable with a three core shielded cable of maximum 20 Ω lead resistance per conductor. 2 RTD inputs available. |
| Communications | Protocol: Modbus RTU or ASCII Topology: Multidrop/daisychain Cable: Single shielded twisted pair, 0.5 mm² (24 AWG) or larger Length: Typical 2.7 km max @ 9600 Baud Quantity: Up to 32 devices Address: Programmable |
Functional Overview
The HTC-915 Controller manages heat tracing applications by receiving input from temperature sensors and controlling heating elements. It can be configured for various operational modes and includes alarm functions for safety and monitoring. The system can also interface with an optional HTC-915-LIM limiter for enhanced protection against over-temperature conditions.
Connection Diagram - Terminal Assignments
Controller Terminals:
- 1. RTD 1 source
- 2. RTD 1 sense
- 3. RTD 1 common
- 4. Shield
- 5. RTD 2 source
- 6. RTD 2 sense
- 7. RTD 2 common
- 8. External Input + (Inhibit/override)
- 9. External Input - (Inhibit/override)
- 10. Communications (RS-485+)
- 11. Communications (RS-485 -)
- 12. Shield
- 13. Digital common (to Limiter 1)
- 14. +12Vdc out (to Limiter 2)
- 15. TX data (to Limiter 3)
- 16. RX data (from Limiter 4)
- 17. Mains Input (L1)
- 18. Mains Input (L2/neutral)
- 19. Control relay output
- 20. Control relay output
- 21. Alarm relay output
- 22. Alarm relay output
- 23. PE
- 24. SSR control output +
- 25. SSR control output –
- 26. Load Current CT input
- 27. Load Current CT input
- 28. Shield
- 29. GF CT input
- 30. GF CT input
Limiter Terminals:
- 1. Digital common (from HTC 13)
- 2. +12Vdc in (from HTC 14)
- 3. RX data (from HTC 15)
- 4. TX data (to HTC 16)
- 5. RTD 1 source
- 6. RTD 1 sense
- 7. RTD 2 common
- 8. Shield
- 9. Control relay output
- 10. Control relay output
- 11. Alarm relay output
- 12. Alarm relay output
- 13. Load current CT input
- 14. Load current CT input
Operator Console & Operation
The console features an alpha-numeric display and a 6-key keypad for operation. Key functions include:
- SHIFT: Activates alternate functions.
- TEST: Initiates a 30-second tracing test.
- BACK: Exits the current menu or cancels edits.
- ENTER: Selects menu items or accepts parameter values.
- Up/Down Arrows (⬆️ / ⬇️): Navigate menus and adjust values.
LED indicators display the operating mode (SHIFT, ALARM, MONITOR, CONFIG) and the status of the alarm and control outputs.
Limiter Functionality
The optional HTC-915-LIM limiter provides additional safety by tripping the heating circuit if certain conditions are met, such as exceeding the setpoint or detecting sensor failures.
- Limiter Current Sensor Input: Can be configured to allow temperature overshoot if no current is flowing, useful for external heat sources. Sensors are monitored for short circuit and cable breakage.
- Limiter Outputs: Includes a control output (typically for an EMR) and an alarm output that changes state upon limiter trip, power-up, or detected faults.
- Limiter Reset: Requires manual reset after tripping, only possible if the actual temperature is below the limit temperature minus hysteresis. Reset methods include console, limiter unit button, external input, or DCS system.
Configuration
The HTC-915 system can be configured using the console's menu system. Key configuration areas include:
- Basic Mode Menu: For essential settings like Control Setpoint, Lo TS 1, Lo Load, Switch Control Mode, Circuit Breaker, Temp. Units, and Feature Mode.
- Advanced Mode Menus: Provides more detailed settings for temperature alarms (TS Alarms), other alarms, point setup, and miscellaneous configurations.
- Communication Setup Sub-Menu: Configures communication parameters such as Protocol (Modbus RTU/ASCII), Address, Baud Rate, Parity, and Tx Delay.
Note: Factory default settings are provided for firmware V1.0X. Users are responsible for verifying and adjusting configurations for their specific applications.
Installation and Maintenance
- Installation Personnel: Must be qualified and familiar with electrical equipment and safety practices.
- Installation Location: Consider atmospheric conditions, accessibility, and ambient temperature.
- Operator Safety: Ensure all power sources are de-energized before maintenance. The HTC-915 module requires protection by external over-current and disconnect devices.
- Mounting: Designed for standard 35 mm x 7.5 mm DIN rail mounting.
- Maintenance: The HTC-915 is designed to be maintenance-free. Inoperative components should be returned to Chemelex.
- Cleaning: Use a damp cloth only when disconnected from power. Avoid harsh chemicals.
- Electrical Connection: Use screw connections suitable for 0.5 to 2.5 mm² cables. Do not rely on the controller as a disconnect device.
- Installation Notes: Isolate the unit from the mains supply when working on it. Be aware of multiple power sources. Avoid magnetic or electric fields. Route cables separately. Use twisted and screened cables for sensor extensions, with shields earthed on the controller side.
Contact Information
For technical support or inquiries, please contact Chemelex:
- North America: Tel +1 800 545 6258, info@chemelex.com
- Latin America: Tel +1 713 868 4800, info@chemelex.com
- Europe, Middle East, Africa, India: Tel +32 16 213 511, Fax +32 16 213 604, info@chemelex.com
- Asia Pacific: Tel +86 21 2412 1688, infoAPAC@chemelex.com
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