background image

ML6984, ML7984 SERIES 4000 DIRECT COUPLED VALVE ACTUATORS

Automation and Control Solutions

Honeywell International Inc.

1985 Douglas Drive North

Golden Valley, MN  55422

customer.honeywell.com

® U.S. Registered Trademark
© 2016 Honeywell International Inc.
95C-10939—11    M.S.  Rev. 09-16 
Printed in United States

TROUBLESHOOTING

TYPICAL SPECIFICATIONS

Valve Actuators shall mount directly to the bonnet of the 
valve, and shall be self-contained and self adjusting. 

Direct coupled valve actuators shall be 24° Vac or 28° Vdc 
power, available with floating or modulating control signal 
inputs. Actuator shall be usable with common power 
supply for multiple actuators and controllers. 

Position feedback voltage/pilot duty auxiliary switch kit, 
mounting adaptor, high temperature kits, and resistor kits 
for multiple actuator application shall be optional 
accessories for direct coupled valve actuators. 

Direct coupled valve actuators shall have a minimum 
performance rating of 50,000 full stroke cycles plus 
1,000,000 repositions documented in the product 
literature. 

Direct coupled valve actuators shall be manufactured by 
the same company as manufacturers of the valves.

Symptom

Possible Causes

Actions

Valve seat leaks or will not close 
properly

Wrong actuator used and/or system head pressure too 
high

1) Check valve close-off rating
2) Check voltage at actuator terminals

Actuator not properly installed

Ensure valve stem is fully threaded into brass drive shaft and locked 
in place with the set screw

Incorrect DIP switch settings

Check against Product Instruction Sheet

Noisy Motor

Bearing failed due to overheat

1) Check for excessive temperature and replace complete actuator
2) Use high temperature kit (43196000-001)

Brushes worn out

Check for excessive cycling and replace actuator 

Motor 
overheats/smoke/component 
burn-out

Current sensing circuit failed or electronic components 
failed

Replace actuator. Make sure:
1) Correct actuator used
2) Properly installed
3) Do not operate actuator before mounting on valve supply
4) Proper voltage supply

ML will not respond

LED (on):

Incorrect DIP switch settings

Check against Product Instruction Sheet

No control signal present

Check controller

Incorrect wiring connections

Check against Product Instruction Sheet

Internal time delay

Allow at least 1/2 - 1 second for the ML to respond

LED (off):

No or low power supply

Check voltage on T5 and T6 terminals

Error mode (gearbox damage)

1) Check power supply
2) Check calibration cycle
3) Valve stroke length less than 1/2 in. or greater than 1-1/4 in.
4) Reset device by a momentary disconnect of power at T5 and T6

Vdc/mA signal drops when 
connected to ML

ML7984 in mA mode with voltage input

Change DIP switch setting

Signal degradation due to incompatible load impedance

Output and ML input impedance specifications

Actuator yoke corrodes

Galvanic reaction from dissimilar metals if 
SS U-bolt used with aluminum yoke

Replace U-bolt with galvanized U-bolt and nuts

Floating Actuator position “drifts” 
when used with building 
automation system

Mismatch between actuator resolution 
(30 steps) and BAS controller

1) Read actual valve position using 272630D feedback module
2) Rewire actuator for 3-wire control
3) Program daily valve reset.

Содержание ML6984

Страница 1: ... supply for multiple actuators and controllers 24 Vac or 28 Vdc power supply Field addable position feedback auxiliary switch module available for 5 wire models APPLICATION The ML6984 and ML7984 are self contained self adjusting motorized valve actuators that mount directly onto V5011 two way and V5013 three way globe valves providing linear stem operation between 1 2 in 13 mm and 1 in 25 mm ML698...

Страница 2: ...istance Electrical Ratings Power supply consumption 24 V 10 15 50 60 Hz or 28 Vdc 10 6 VA Run ning 12 VA Valve seating CE Certified Inputs ML6984 25 mA 24 Vac 5 wire mode only 500 mA valve seating 3 wire mode Minimum Signal Input Duration 100 ms ML7984 2 10 Vdc 1 mA 4 20 mAdc May be used with 0 10 Vdc input but valve will be closed at 2 Vdc Input Impedance for the ML7984 Voltage Source 20 KW ohm C...

Страница 3: ...lations Honeywell assumes no responsibility for damages or injuries resulting from non compliance with installation instructions or standard good practice when mounting operating or maintaining the valves even if not explicitly mentioned in the installation instructions Observe all safety practices when working with steam systems Mounting 1 Ensure that valve body is installed correctly arrow point...

Страница 4: ... age the threads or other parts of the stem 4 Orient the conduit hole to the most desirable direc tion then tighten the LOCKNUTS on the U bolt 5 Remove the plastic cover from the MLx984 by loos ening the two captive screws located on the top Drop the Allen Hex type of set screw included in the plas tic bag into the top of the shaft hex side up 6 Tighten the set screw to lock valve stem in place Fi...

Страница 5: ... CAN SHARE SAME TRANSFORMER PROVIDED THAT THE VA RATING OF THE TRANSFORMER IS NOT EXCEEDED AND PROPER PHASING IS OBSERVED DO NOT MIX A C AND D C POWER SOURCES CONTROLLER CAN BE LOW VOLTAGE SPDT SERIES 20 ON OFF OR SP3T SERIES 60 FLOATING TRI STATE TYPE TERMINALS R AND T5 ARE CONNECTED INSIDE THE ML6984 1 2 3 1 2 3 M25493A 3 1 3 W R B T6 T5 C H ML6984 TYPICAL ELECTRONIC CONTROLLER L1 L2 POWER SUPPL...

Страница 6: ...EM MOVES UPWARDS WITH SIGNAL INCREASES TO 10V 20MA ALWAYS TURN POWER OFF BEFORE SETTING ANY DIP SWITCHES 1 2 3 4 5 3 2 1010 10 2 VDC REVERSE ACTING 3 2 3 2 M25496A T5 T6 L1 L2 28 VDC ML7984 R W C T5 T6 OR SIGNAL SOURCE C R W T5 T6 ML7984 ML7984 SLAVE R W C T5 T6 24 VAC FUNCTION DIP SWITCH CONFIGURATION X000 4 20 MA DIRECT ACTING X010 20 4 MA REVERSE ACTING 1 2 3 4 ON 1 OFF 0 1 2 3 4 ON 1 OFF 0 POW...

Страница 7: ...SELECT DEVICE FUNCTIONS DIRECT ACTING FUNCTION ACTUATOR STEM MOVES UPWARDS WITH SIGNAL INCREASE OR REVERSE ACTING FUNCTION ACTUATOR STEM MOVES DOWNWARDS WITH SIGNAL INCREASE 5 TURN POWER OFF BEFORE SETTING ANY DIP SWITCHES FOR COMMON TRANSFORMER AND COMMON CONTROLLER APPLICATION PLEASE CONSULT THE FACTORY 6 MAXIMUM RESISTANCE PER CONTROL CIRCUIT OF 280 OHM M25497A B R W T6 T5 B R W B R W T6 T5 B R...

Страница 8: ...ES TO 10V 20MA OR REVERSE ACTING FUNCTION ACTUATOR STEM MOVES DOWNWARDS WITH SIGNAL INCREASES TO 10V 20MA 5 TURN POWER OFF BEFORE SETTING ANY DIP SWITCHES R W R W M25499A T6 T5 B R W ML7984 T6 T5 B R W L1 L2 OR 28 VDC 24 VAC T5 T6 ML7984 ML7984 T6 T5 B R W R W ELECTRONIC SERIES 90 W973 T775 H775 W7100 NOTE POLARITY SENSITIVE CHECK CONNECTIONS W to R R to W L1 L2 L1 L2 OR OR 28 VDC T5 T6 28 VDC T5 ...

Страница 9: ...nect power supply before beginning installation to prevent electrical shock and equipment damage All wiring must comply with applicable local electrical codes ordinances and regulations Make certain that the voltage and frequency of the power supply correspond to the rating of the device DO NOT electrically operate the MLx984 actuator before assembly to the valve because damage not apparent to the...

Страница 10: ...base between terminals Rc and Y This is needed for electrical compatibility with ML6984 but may result in wider room temperature swings due to the loss of anticipation REPLACEMENT NOTES Fig 18 ML6984 with Honeywell T87K Round Thermostat See Fig 19 if connecting TH5110D or TH6110D FocusPRO thermostats to ML6984 Configure the thermostats for Series 20 operation Fig 19 ML6984 with FocusPro Electronic...

Страница 11: ...endent output switch is needed wire the 2 10 Vdc position feedback signal to an Approved adjustable voltage controlled relay CHECKOUT ML7984 1 Make sure the valve stem is completely screwed into the actuator drive shaft with no threads showing before applying power 2 Make sure the valve stem is locked in place with the set screw 3 Make sure the Configuration DIP switches are set correctly 4 With 2...

Страница 12: ...P switch settings Check against Product Instruction Sheet Noisy Motor Bearing failed due to overheat 1 Check for excessive temperature and replace complete actuator 2 Use high temperature kit 43196000 001 Brushes worn out Check for excessive cycling and replace actuator Motor overheats smoke component burn out Current sensing circuit failed or electronic components failed Replace actuator Make sur...

Отзывы: