1. Manuals
  2. Brands
  3. EGS Manuals
  4. Circuit breakers
  5. Nelson CM-1
  6. Manual

EGS Nelson CM-1 Manual

Circuit monitor
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
CM-1 MANUAL

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Nelson CM-1 and is the answer not in the manual?

Questions and answers

Related Manuals for EGS Nelson CM-1

Summary of Contents for EGS Nelson CM-1

  • Page 1 CM-1 MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS GENERAL INFORMATION ....................... 3 INSTALLATION ..........................4 Signal When to Monitor Heater ............................5 FIELD WIRING ........................... 5 PROGRAMMING ..........................7 Circuit Monitor Options..............................8 Power Frequency ................................9 Alarm Silence Time-out..............................10 Scan Speed ..................................10 Alarm Reset Auto/Manual ..............................10 CM-1 ambient panel start-up procedures ........................12 OPERATION............................

  • Page 3: General Information

    GENERAL INFORMATION The Nelson CM-1 Circuit Monitor is a scanning microprocessor system which sequentially monitors and displays each circuit number and the status of each circuit. The CM-1 is environmentally hardened and requires no protected operative environment. It can be located in a control room or out in a plant.

  • Page 4: Installation

    INSTALLATION When routing conduit to the panel, avoid top entry into the CM-1 enclosure. Top conduit entry provides a potential moisture path to the electronic circuit boards. Bottom conduit entry is recommended. If top entry cannot be avoided, avoid the area directly over the circuit boards. Drip loops as shown are recommended for side and top entry when they cannot be avoided.

  • Page 5: Signal When To Monitor Heater

    SIGNAL WHEN TO MONITOR HEATER The monitor looks for a closed contact signal from a temperature controller before it tries to monitor the heater for current, voltage, and continuity. The default set-up requires an input signal for each monitor channel. When a group of heater channels are controlled by a single thermostat (grouped or ambient control), the panel inputs have to wire in parallel to the single contact signal.
  • Page 6 Branches are monitored by current flow on process applications. Short side branch Long side branch (under 10') CM-1 Long side branch WILL NOT WORK BRANCH / TEE PIPING (single circuit, multiple cable segments) LEGEND CM-1, CM-2/1 Heater Connection Kit Pipe Heater Cable Long side branch WILL NOT WORK...

  • Page 7: Programming

    PROGRAMMING The CM-1 is shipped with programming to monitor all available circuits. With this configuration, all 24 circuits will be scanned for alarms. Alarm delay is set for 5 seconds, alarm reset is automatic, and the display speed is fast. Each of these features and options will be covered on the next few pages. However, the system is suitable to be powered in the existing configuration.

  • Page 8: Circuit Monitor Options

    CIRCUIT MONITOR OPTIONS The top 6 rows of option jumpers in the jumper programming area are the circuit monitor jumpers. As the system is shipped, all circuits available in the system will be monitored, or “active”. If a circuit is de- activated, remove the appropriate programming pin, and the circuit will be skipped in the monitor sequence.

  • Page 9: Power Frequency

    If circuit #5 is not going to use a CMD, move this jumper to the Left or “A” position. Figure 8 POWER FREQUENCY As shipped from the factory, the system is suitable for 60 Hz. If 50 Hz is required, a jumper must be placed on option #8 programming pin.

  • Page 10: Alarm Silence Time-Out

    ALARM SILENCE TIME-OUT This establishes the amount of time the acknowledged alarm is silenced before re-alarm. If an alarm is acknowledged (which silences the remote alarm relay), and the voltage problem is not corrected, the system will re-activate the remote alarm relay. Alarm Silence Time-out OPT.
  • Page 11 Figure 13 P. O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com GA-2129 Rev. 5 Sheet 11 of 17 September 2005...

  • Page 12: Cm-1 Ambient Panel Start-Up Procedures

    CM-1 AMBIENT PANEL START-UP PROCEDURES 1. Always use caution when energizing heater cables especially when the ambient temperature is above 50°F. Start-up requires that the cables be energized. One way to accomplish this is to set the panel thermostat to a temperature above the current ambient air temperature until start-up is completed.

  • Page 13: Operation

    OPERATION After the installation and programming is completed and 120VAC have been applied to the TB-1, turn the power switch to “ON”. See Figure 1. For a moment both the red and green L.E.D. bars will light, then the system will start scanning. The green light bar will always appear under each active circuit, the first scan after powering up or resetting alarms.

  • Page 14: Alarm Delay

    ALARM DELAY This is a customer preference option. This option establishes the minimum time delay before a loss of voltage condition is registered by the scanner. The option range is from 30 seconds to 5 minutes. Times shown are in seconds and minutes and are additive. A longer time is recommended to prevent alarming of temporary power interruptions.

  • Page 15: Current Adjustment Procedure

    CURRENT ADJUSTMENT PROCEDURE The CM-1 sensor card has an adjustable current alarm. The current adjust feature works with all types of heater cables; self-regulating, constant wattage and MI. The sensor cards come from the factory preset to a minimum current alarm level of 50 milliamps. Current flow above the minimum threshold is indicated by a red L.E.D.

  • Page 16: Digital Display Window

    DIGITAL DISPLAY WINDOW The circuit numbers being scanned by the system are displayed here in the status area. CIRCUIT HEATER ON CONTINUITY CURRENT VOLTAGE Monitor Display Figure 17 Conditions: 1) No light bar energized below the circuit number indicates the circuit is de-energized. This is a non- alarm condition.
  • Page 17 P. O. BOX 726 TULSA, OK 74101 TEL 918-627-5530 FAX 918-641-7336 www.nelsonheaters.com GA-2129 Rev. 5 Sheet 17 of 17 September 2005...
  • Page 18 Nelson Heat Tracing Systems products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at www.nelsonheaters.com. ©Copyright 2005 GA-2129 Rev.5...

Table of Contents