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Related Manuals for Emerson Nelson CM-1
Summary of Contents for Emerson Nelson CM-1
- Page 1 CM-1 C I R C U I T M O N I T O R I N G S Y S T E M...
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Page 3: Table Of Contents
TABLE OF CONTENTS GENERAL INFORMATION ....................... 4 INSTALLATION ..........................5 Signal When to Monitor Heater ............................6 FIELD WIRING ........................... 6 PROGRAMMING ..........................8 Circuit Monitor Options ..............................9 Power Frequency ................................10 Alarm Silence Time-out ..............................11 Scan Speed ..................................11 Alarm Reset Auto/Manual .............................. -
Page 4: 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 5: 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 6: 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 7 Branches are monitored by current f low 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...
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Page 8: 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 minutes, 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 9: Circuit Monitor Options
CIRCUIT MONITOR OPTIONS The top 6 rows of option switches in the programming area are the circuit monitor switches. As the system is shipped, all circuits available in the system will be monitored, or “active”. If a circuit is de- activated, flip the appropriate programming switch off, and the circuit will be skipped in the monitor sequence. -
Page 10: Power Frequency
If circuit #5 is not going to use a CMD, Flip switch 2 of row 2 off, and switch 1 of row 2 on. Figure 7 POWER FREQUENCY As shipped from the factory, the system is suitable for 60 Hz. If 50 Hz is required, programming option Switch #8 must be flipped to ON position. -
Page 11: 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 z –... -
Page 12: Programming Option Features
Figure 12 www.nelsonheaters.com GA-2129 Rev. 11 Sheet 12 of 22 Jul. 2018... -
Page 13: 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. Note: 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. 2. -
Page 14: Modbus Rtu Communication
MODBUS RTU COMMUNICATIONS These MODBUS RTU Communication instructions are specific to the Modbus communications setup for the CM-1 Monitoring System. Modbus communications are only provided on recent production Scanner Board GC0698. Wiring Instruction From modbus master Modbus connection wire A connects to Scanner Board GC0698 - TB5 – 7 Modbus connection wire B connects to Scanner Board GC0698 - TB5 –... -
Page 15: Operation
OPERATION After installation and programming is completed, and 120VAC has been applied to 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 16: 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 8 minutes. Times (shown in seconds and minutes) are additive. Longer alarm delay times are recommended to prevent alarming of temporary power interruptions. -
Page 17: 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 18: 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 16 Conditions: 1) No light bar energized below the circuit number indicates the circuit is de-energized. This is a non- alarm condition. -
Page 19: Field Wiring Diagram
www.nelsonheaters.com GA-2129 Rev. 11 Sheet 19 of 22 Jul. 2018... -
Page 20: Control Device Schematics
www.nelsonheaters.com GA-2129 Rev. 11 Sheet 20 of 22 Jul. 2018... -
Page 21: Assembly Diagram
www.nelsonheaters.com GA-2129 Rev. 11 Sheet 21 of 22 Jul. 2018... -
Page 22: Notes
NOTES: www.nelsonheaters.com GA-2129 Rev. 11 Sheet 22 of 22 Jul. 2018... - Page 24 Nelson Heat Tracing System products are supplied with a limited warranty. Complete Terms and Conditions may be found on Nelson's website at www.nelsonheaters.com. ©Copyright 2018 GA-2129 Rev. 11...