Emech Troubleshoot Guide

Emech Troubleshoot Guide
Armstrong Hot Water, Inc. – Emech Troubleshoot Guide
221 Armstrong Blvd., Three Rivers, Michigan 49093 – U.S.A. Phone: (269) 279-3602
Actuator display lights up
intermittently, but does not move
Check
Is 24 Vdc power supply is
adequate?
The power supply does not
have the required capacity.
Review the power supply transformer
rating with Section 4.0 in the G1 IOM.
No
Yes
Is 24 Vdc supply stable at
actuator terminals?
No
The power supply cables have an
excessive voltage drop. Review cable
rating with Section 7.2.2 in the G1 IOM.
Yes
Obtain serial number of actuator
or valve & model number of
actuator or valve
Contact factory @ 269-279-3602
Check serial register to see who
sold to
Actuator dead (display not lit, no
movement)
Check
Toggle push button set to ‘on’?
No
Toggle push button is ‘off’
Push button ‘on’!
Yes
Is the fuse ok?
No
Replace fuse – if fuse blows repeatedly
please contact factory @ 269-279-3130
Yes
Obtain serial number of
actuator/valve & model number
of actuator/valve
Contact factory @ 269-279-3602
Check serial register to see who
sold to
Fax: (269) 279-3130
No communication when using
EmechConfig
Check
Is Emech supplied serial cable
properly connected at the PC
and actuator?
Check for damage to connector pins, and
connect serial cable properly.
No
Yes
In EmechConfig, is the correct
COM port selected from the
COMS menu?
Wrong port may be selected.
Determine to which port on the PC
the serial cable is attached. This is
usually COM1 for notebook
computers, unless using a USB serial
adapter in which case COM4, COM5
or others
are possible.
No
Yes
Is actuator powered (display
backlight is lit)?
No
Actuator is turned off.
Power actuator, or check the section
“Actuator Dead” in this guide if problems
persist
Actuator displays ‘E2’ when set
Temperature Controller Mode
Check
Is temperature probe properly
connected to the actuator plug?
No
Ensure probe is securely plugged into
actuator
No
Original temperature probe is damaged.
Yes
Replace temperature probe. Is
the error still there?
Yes
Obtain serial number of
actuator/valve & model number
of actuator/valve
Contact factory @ 269-279-3602
Intelligent System Solutions® S T E A M ● A I R
armstronginternational.com
Check serial register to see who
sold to
● HOT WATER
Armstrong Hot Water, Inc. – Emech Troubleshoot Guide
221 Armstrong Blvd., Three Rivers, Michigan 49093 – U.S.A. Phone: (269) 279-3602
Failure to Reach Set Point
Check
Is valve closed (i.e. no flow) when
the coupling visual indicator shows
‘zero’ position? (use positioner mode
to move to ‘zero’ position)
No
Yes
Is actuator set to temperature control
mode? (No leds, or led 1 only lit
indicated temperature control mode).
No
Yes
Is the manual override handle
disengage? (preventing motor
movement)
No
Yes
Are water supplies cold/hot enough
to achieve desired set point?
Manually move the actuator to see if
the desired temperature can be
achieved.
No
Yes
Compare the Emech temperature
reading with another thermometer.
Does the temperature display match
the displayed temperature?
Yes
Is actuator properly configured for the
valve?
No
Actuator shaft is not properly aligned with
valve spindle. Move actuator to ‘zero’
position. Remove actuator. Rotate valve
stem so that the notch in points toward the
cold port (on F3). Reattach actuator.
Fax: (269) 279-3130
Actuator is in positioner mode and will not respond to temperature change at the
outlet. Hold the MODE button and press the
DOWN button to toggle into temperature controller mode. This will be confirmed by
either no lit leds (deg C), or led 1 only lit (deg F).
Manual override is preventing the motor from moving the valve. Make sure the manual
override is pushed in (fully disengaged). Water supply temperatures are insufficient to
achieve set point. Reevaluate set point
requirement, or alter supply temperatures. Faulty/damaged temperature probe; contact factory @ 269-279-3602 for a replacement
Actuator may be setup for wrong valve. This
limits its operating stroke and prevents
effective control. Select the correct valve
type in EmechConfig. Run EmechConfig
and check that selected config settings for
the appropriate valve type (F2, F3, F4, etc).
No
Yes
Obtain serial number of
actuator/valve & model number
of actuator/valve
Contact factory @ 269-279-3602
Check serial register to see who
sold to
Control is Unstable/Oscillates
Check
Does the outlet flow from the valve
meet or exceed the flow specified in
the product manual for minimal stable
temperature control?
No
Flow may be too low for stable control. The
main options for preventing instability are:
1. Achieve a higher flow
2. Decrease control gains until control
stabilizes
3. If appropriate, replace valve with a smaller
model that can achieve stable control with
lower flow
No
Selected control gains may be too high for
application, try standard gain settings.
Yes
Are control gains set to higher than
normal values? Standard Proportional
Gain=200 and Differential Gain=-20.
Yes
Are the supply pressures nominally
equal to each other?
No
Pressure imbalance may be contributing to
instability. Decrease control gains until control
is stable, or add pressure regulating to limit the
imbalance.
Yes
Obtain serial number of
actuator/valve & model number
of actuator/valve
Contact factory @ 269-279-3602
Intelligent System Solutions® S T E A M ● A I R
armstronginternational.com
Check serial register to see who
sold to
● HOT WATER
Armstrong Hot Water, Inc. – Emech Troubleshoot Guide
221 Armstrong Blvd., Three Rivers, Michigan 49093 – U.S.A. Phone: (269) 279-3602
Fax: (269) 279-3130
Control is Unstable/Oscillates
Check
Is Actuator set to receive a remote
signal? (Indicated by REMOTE LED
on the display panel)
No
Actuator is in LOCAL Mode and will not
respond to REMOTE signal. Hold the MODE
button and press the SET button to toggle into
REMOTE mode.
No
Signal may be connected to the incorrect
terminals or could be reversed. Connect signal
to correct terminals. See Section 8 in G1 IOM.
No
The signal source may be outside the Emech
actuator’s expected signal range. Check with a
loop calibrator that the signal is within the
specified range. See Section 8 in the G1 IOM.
Yes
Is loop signal connected to the correct
terminals on the Emech Actuator
terminal block, and with the correct
polarity?
Yes
Is remote signal a powered loop signal
in the range 4-20mA? (or 5-19mA for
active temperature control)
Yes
Obtain serial number of
actuator/valve & model number
of actuator/valve
Contact factory @ 269-279-3602
Check serial register to see who
sold to
Intelligent System Solutions® S T E A M ● A I R
armstronginternational.com
● HOT WATER
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