Submittal Sheet

ML6984, ML7984 SERIES 4000 DIRECT COUPLED VALVE ACTUATORS
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2008 Honeywell International Inc.
95C-10939—6 J.I. Rev. 04-08
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 fl oating 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 manufactures the valves.
SYMPTOM POSSIBLE CAUSES ACTIONS
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 momentar 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
specifi cations
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