Robertshaw 365A User manual

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 1 -
INSTRUCTION MANUAL
FOR
MODEL 365A & E365A
VIBRASWITCH®MALFUNCTION DETECTOR
Robertshaw Industrial Products
1506 Mustang Drive
Maryville, Tennessee 37801
Phone: [phone] Fax: [phone]
INSTRUCTION MANUAL NUMBER
909GF294G

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 0 -
TABLE OF CONTENTS
SECTION PAGE
1 DESCRIPTION .................................................................................................................... 1
1.1 General .................................................................................................................................... 1
1.2 Model Identification .................................................................................................................. 1
2 SPECIFICATIONS .................................................................................................. 2
2.1 Environmental .......................................................................................................................... 2
2.2 Electrical .................................................................................................................................. 2
2.3 Performance ............................................................................................................................ 2
2.4 Enclosure ................................................................................................................................. 2
2.5 Agency Certification ................................................................................................................. 2
3 INSTALLATION ...................................................................................................... 3
3.1 General .................................................................................................................................... 3
3.2 Mounting .................................................................................................................................. 3
3.3 Space Heater ........................................................................................................................... 3
3.4 Wiring ....................................................................................................................................... 6
4 OPERATION ........................................................................................................... 9
4.1 Operation ................................................................................................................................. 9
4.2 Adjustment of Operating Setpoint ............................................................................................ 9
5 MAINTENANCE .................................................................................................... 12
5.1 Trouble Shooting ................................................................................................................... 12
5.2 Replacement (Spare) Parts ................................................................................................... 13
5.3 Repairs ................................................................................................................................... 13
5.4 Routine Maintenance ............................................................................................................. 14
ILLUSTRATIONS
FIGURE PAGE
3-1 Methods of Mounting the Vibraswitch ....................................................................................... 4
3-2 Dimensions ................................................................................................................................ 5
3-3 External Wiring Connections ..................................................................................................... 6
3-4 Terminal Configurations ............................................................................................................ 7
3-5 Preparation of Conduit Wiring ................................................................................................... 8
3-6 Connection of Conduit Wiring .................................................................................................... 8
4-1 Operating Principal for the Vibraswitch ..................................................................................... 9
4-2 Setpoint Adjustment ................................................................................................................ 10
4-3 Setpoint Alarm Settings ........................................................................................................... 11
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MODEL 365A & E365A VIBRASWITCHES 909GF294G
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Section 1 – DESCRIPTION
1.1 GENERAL
The Model 365A and E365A Vibraswitches provide
maximum protection for large motors, pumps,
compressors, and other rotating equipment by
responding to mechanical malfunctions the instant
they occur. Failing bearings, bent shafts, broken
blades, overspeeding and similar malfunctions cause
increased imbalance or high frequency vibration
detectable with the Model 365A and E365A
Vibraswitches. The instruments may be wired to
actuate an alarm or cause a shutdown before costly
damage occurs. They are designed for
maintenance-free service in permanent installations.
The Vibraswitches are acceleration sensitive
instruments. Acceleratory measurements made by
the Vibraswitches are the summation of all the
individual accelerations giving a total destructive force
acting on the machine - the result is positive
protection.
Vibraswitches may be supplied with or without a reset
coil. Reset coils may be used with external time delays
for preventing false trips on those machines with
excessive start-up vibration by applying the rated
voltage during machine start-up (for 4 minutes
maximum). Reset coils may also be used to reset the
Vibraswitch from a remote location by applying the
rated voltage.
Space heaters are intended to prevent condensation
in the enclosure caused by climate conditions in some
outdoor installations. Space heaters require constant
power and are not required in most applications.
With the growing use of computers, an increasing
number of applications are coming into existence
where a Vibraswitch will be connected to a computer
or PLC. In these applications the voltage and/or
current may be too low for standard contacts. For
these applications the Model 365A and E365A may be
supplied with an optional sealed switch with gold
contacts.
The Vibraswitch may be used in conjunction with the
Model 563A Monitor This Monitor is designed to “sort-
out” false signals received by the Vibraswitch so that
Alarm and/or Shutdown will not result from false
transient disturbances.
1.2 MODEL IDENTIFICATION
Identify Vibraswitch models in accordance with the
descriptions and variations listed in each table.
365A - A 8 - H
Key Model No.
Table 1 – Switch Contacts
Table 2 – Reset Coil
Table 3 – Special Options
KEY MODEL NO.
Model No. Description
365A Vibraswitch, UL Certified for the U.S.A. &
c-UL Certified for Canada.
E365A Vibraswitch, CE (ATEX) Certified for Europe, UL Certified for the U.S.A. &
c-UL Certified for Canada.
Table 1 – SWITCH CONTACTS
Desig. Description
A SPDT – Single pole, double throw load
contacts.
D DPDT – 2 gang mounted SPDT load
switches.
G DPDT – 2 gang mounted SPDT sealed switches with gold contacts for low
voltage/current applications.
Table 2 – RESET COIL
Desig. Description
0 No reset coil
2 24 volt DC reset coil
3* 240 volt AC reset coil.
4 48 volt DC reset coil
7 117 volt DC reset coil
8 120 volt AC reset coil
* Not Agency Certified. Not available with model E365A.
Table 3 – SPECIAL OPTIONS
Desig. Description
Omit No special options. Enclosure 4 & IP66,
unpainted aluminum.
E Enclosure 4X & IP66, exterior painted with
gray epoxy enamel.
H Space heater installed for maintaining
internal area of enclosure moisture free.
EH
Enclosure 4X & IP66, exterior painted with
gray epoxy enamel, and space heater
installed for maintaining internal area of
enclosure moisture free.

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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Section 2 - SPECIFICATIONS
2.1 ENVIRONMENTAL
Ambient Temperature Limits:
-13°F to +140°F (-25°C to +60°C)
Shock ................................... 40 G @11 ms maximum
Net weight .............................................. 7 lbs (3.2 kg)
Shipping weight .................................... 8 lbs (3.6 kg)
2.2 ELECTRICAL
Contact Arrangement ....................... SPDT or DPDT
Contact Rating:
Designation “A”:
SPDT
7 A max, 460 VAC max, 50/60 Hz, NI;
0.5 A max, 120 VDC max, NI;
1 A max, 48 VDC max, NI;
2 A max, 24 VDC max, NI;
5 A max, 12 VDC max, NI
Designation “D”:
DPDT
5 A max, 240 VAC max, 50/60 Hz, NI;
5 A max, 30 VDC max, NI
Designation “G”:
DPDT – Sealed switch, gold contacts
0.1 A max, 125-250 VAC, NI;
0.1 A max, 30 VDC, NI;
5 mA min at 6 VDC, NI;
2 mA min at 12 VDC, NI;
1 mA min at 24 VDC, NI
Reset Coil Voltages & Power:
24 VDC ±10%, 0.5 amp
48 VDC ±10%, 0.2 amp
117 VDC ±10%, 0.14 amp
120 VAC ±10%, 50/60 Hz, 0.3 amp
240 VAC ±10%, 50/60 Hz, 0.3 amp
Reset Coil Duty Cycle ................. 4 minutes ON max.
10 minutes OFF min.
Space Heater ............................. 2 watt, same voltage
as reset coil
2.3 PERFORMANCE
Set Point Range:
Mounted Horizontal .............. 0 to 4.5 G (peak)
Mounted Vertical ................... 0 to 3.5 G (peak)
Frequency Range .................................... 0 to 300 Hz
(0 to 18,000 RPM)
Set Point Adjustment ..............................1 G per turn
(approximate)
Manual Reset .......................... Included on all models
2.4 ENCLOSURE
Enclosure ................ Aluminum, unpainted (standard)
Aluminum, epoxy painted (optional)
Enclosure seals ............................................ Silicone
Enclosure Hardware ........................... Stainless steel
Enclosure Rating:
Model 365A:
Class I, Div. 1, Group B, C & D;
Class II, Div. 1, Group E, F & G;
Enclosure 4 or 4X:
Class I, Zone 1, AEx d IIB+H T6;
Ex d IIB+H T6; IP66
Model E365A:
Class I, Div. 1, Group B, C & D;
Class II, Div. 1, Group E, F & G;
Enclosure 4 or 4X:
Class I, Zone 1, AEx d IIB+H2 T6;
Ex d IIB+H2 T6; IP66;
ATEX EEx d IIB+H2 T6 IP66
2.5 AGENCY CERTIFICATIONS
UL ................................................. File No. E164999
c-UL .............................................. File No. E164999
CE (ATEX) ......................................... Certificate No.
DEMKO 05 ATEX 0436069
CE PRODUCT CERTIFICATION
Vibraswitch models with CE (ATEX) Approval are
distinguished by the addition of the CE mark on the
nameplate. The nameplate includes additional
information:
Manufacturer’s name and address:
Robertshaw Industrial Products
1602 Mustang Drive
Maryville, TN 37801
The manufacturer’s Model Number:
E365A
Serial number:
Unique serial number assigned by manufacturer
which includes a code for year of construction.
Marking according to Group II: IIB+H
Marking essential for safe use: T6
Enclosure Rating: IP66
Certificate number:
DEMKO 05 ATEX 0436069
Essential information for safe use:
1.The equipment temperature code is T6.
2.The ambient temperature range for the equipment
is -13°F (-25°C) to +140°F (+60°C).
3.The equipment must be bolted closed before
power is applied.
4.All cable entry devices and blanking elements
shall be certified in type of explosion protection
flameproof enclosure “d”, suitable for the
conditions of use and correctly installed.

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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5.Unused apertures shall be closed with suitable
blanking elements.
Section 3 - INSTALLATION
3.1 GENERAL
Examine the Vibraswitch for possible shipping
damages. IMPORTANT: If for any reason it is
determined that the Vibraswitch should be returned to
the factory, please notify the nearest Robertshaw
sales representative prior to shipment. Each
Vibraswitch must be properly packaged to prevent
damage. Robertshaw assumes no responsibility for
equipment damaged in shipment due to improper
packaging.
Choose the location in accordance with good
instrument practice, avoiding extremes of temperature,
humidity and vibration (see SECTION 2 –
SPECIFICATIONS).
The Model 365A and E365A Vibraswitches are
certified for use in hazardous areas as indicated in
SECTION 2 – SPECIFICATIONS. In locations where
moisture condensation within explosion-proof junction
boxes is a problem a two-watt resistor (space heater)
may be placed across terminals 6 and 7 inside the
Vibraswitch cover and wired to provide continuous
heat and circulation of air. (See Table 3-1 for
resistance values.)
3.2 MOUNTING
Figure 3-1 illustrates the methods of mounting on
various pieces of equipment. Figure 3-2 shows the
mounting dimensions and Figures 3-3 and 3-4 show
the external wiring for the Vibraswitch.
The vibration sensitive axis of the Vibraswitch is
perpendicular to its mounting base. Therefore, the
Vibraswitch must be mounted on a plane that will
detect the vibratory motion for which protection is
desired. The Vibraswitch may be mounted at any
location along the length of machines containing
rotating shafts that are horizontal and parallel to the
base of the machine; the preferable location being in
line with the rotating shaft (ref. Figure 3-1). Do not
mount the Vibraswitch perpendicular to the ends of
rotating shafts unless the end play or end-thrust
measurement is desired. Normally, bent shafts worn
bearings and other anomalies are detected near the
bearing housings and at right angles to the shaft.
The Vibraswitch may be mounted in any position
between the side (vertical) or the top (horizontal) of
bearings or machine housings. It should be noted that
when mounting Vibraswitches on top (horizontal
position) of equipment the vibration range is as stated
in the SPECIFICATION SECTION. However, when
the Vibraswitch is mounted on a side position (90°
from the horizontal), 1 g is subtracted from the
measurement range.
If a custom mounting bracket is used to mount the
Vibraswitch due to an irregular mounting surface, it
must be constructed of steel having sufficient
thickness and properly reinforced so that mechanical
resonances are not introduced; usually 1/2" (12.7 mm)
steel plate is satisfactory if the dimensions of the
bracket are minimal (ref. Figure 3-1). It is extremely
important that all four corners of the Vibraswitch, as
well as the mounting bracket, be rigidly secured to the
machine. Exact location is not critical as the
adjustment procedure of the Vibraswitch automatically
accounts for the normal vibration at that location.
The Vibraswitch, when properly adjusted, trips on a
relative increase in vibration.
When installing the Vibraswitch on existing equipment
where several convenient mounting positions are
available, it is advisable to check the existing vibration
level at each possible position before permanently
mounting the Vibraswitch. The Vibraswitch can be
used to measure existing vibration by holding or
clamping it against the running machine and
determining the trip point as described under
“ADJUSTMENT” in this manual. Should normal
vibration exceed the range of the Vibraswitch, it is
recommended that consideration be given to a
Robertshaw Velocity-Acceleration Monitor Model 566.
When mounting on a hot surface, metal spacers may
be placed at all four mounting holes to elevate the
Vibraswitch to allow for additional air flow between the
hot surface and the Vibraswitch. Spacers should be
3/4" (19 mm) diameter minimum and 3/4" (19 mm)
high maximum.
3.3 SPACE HEATER
In some outdoor installations, it may be necessary to
install a space heater (resistor) to prevent moisture
condensation. A small conventional carbon 2 watt
resistor should be installed across terminals 6 and 7 in
the Vibraswitch. Proper resistor values are shown in
Table 3-1.
Table 3-1
Space Heater Resistance Values
VOLTAGE
(AC OR DC) SPACE HEATER RESISTOR (OHMS)
460 0.22 meg
240 56,000
120 12,000
48 2,200
24 620

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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Figure 3-1
Methods of Mounting the Vibraswitch

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 5 -
Figure 3-2
Dimensions

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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3.4 WIRING
The Vibraswitch is equipped with a threaded hub for
3/4" conduit. When the vibration amplitude is large
(i.e., greater than 5 mils) it is good practice to use a
short length of flexible conduit to serve as an isolator
between the rigid conduit and the Vibraswitch. Wiring
into the unit should be done with #18 stranded wire,
although #14 can be used where necessary. The
Vibraswitch was not designed for wiring with heavy,
solid wire. However, where necessary to use a
heavier wire, as in low voltage DC applications, a
junction box near the Vibraswitch should be used.
For Vibraswitches with gold plated contacts (Model
365A-G and E365A-G) it is recommended to connect
the two poles in parallel when only one pole is required
(SPST or SPDT operation) as specified in Table 3-2.
Table 3-2
Jumpers for SPST or SPDT Operation
with Gold Contacts
CONNECT TERMINALS
3 to 8 (NO)
4 to 9 (C)
5 to 10 (NC)
NOTE
NOTE
NOTE
NOTE
When wiring the Vibraswitch refer to Figures 3-3, 3-4,
3-5, 3-6 and all instructions associated with those
figures.
Figure 3-3
External Wiring Connections
1. Switch shown in normal (reset) position. Reverses
on actuation from increased vibration.
2. If only a Manual Reset is desired, do not make
connections to terminals 1 and 2.
3. Heater resistor supplied only when specified.
A
ll instrument installation wiring must be done in
accordance with local codes and commonl
y
acce
p
ted
p
ractices.
Conduit runs must have a sealing fitting connected
within 18 inches (46 cm) of the enclosure to preven
t
infiltration of moisture-laden air or corrosive gasses
into the enclosure.
A
ll cable entry devices and blanking elements shall
be certified in type of explosion protection flameproo
f
enclosure “d”, suitable for the conditions of use and
correctly installed.
Unused apertures shall be closed with suitable
blankin
g
elements.

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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365A-A and E365A-A
365A-D, 365A-G, E365A-D and E365A-G
Figure 3-4
Terminal Configurations
PUSH-TO-RESET
BUTTON
SET POINT
A
DJUSTMENT
SCREW
ENCLOSURE
COVER
GND
OPTIONAL SPACE HEATER
NO. 8 TERMINAL SCREW
PUSH-TO-RESET
BUTTON
SET POINT
A
DJUSTMENT
SCREW
ENCLOSURE
COVER
OPTIONAL
SPACE
HEATER
GND
NO. 6 TERMINAL SCREW

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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1-1/2”
(38 MM)
Figure 3-5
Pre
p
aration of Conduit Wirin
g
Figure 3-6
Connection of Conduit Wiring
To avoid unnecessary difficulty in wiring the Vibraswitch, the following procedure should be used:
a. When threading conduit, cut the wires so that all wires project beyond the housing surface approximately 1-1/2”
(38 mm) as shown in Figure 3-5. Do not later pull the wires tight as you will be unable to remove cover holding
the mechanism.
b. Strip wires back 1/4" (6.4 mm) and install solderless terminals.
c. Place the Vibraswitch in position shown in Figure 3-6 and connect wires to corresponding terminals.
d. Flatten wires entering housing against wall on conduit hub side and rotate cover into place, pushing extra wire
into corners near conduit hub.
e. Replace cover bolts, tighten to 75-105 inch lbs (8.5-11.9 Nm).

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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Section 4 - OPERATION
4.1 OPERATION
The Vibraswitch (ref. Figure 4-1), is sensitive to
vibration in a direction (the sensitive axis)
perpendicular to its mounting base. It contains a
vibration detecting mechanism, which also functions
as a “mechanical amplifier”, to activate a snap-action
switch when the selected level of vibration is exceeded
and the detecting mechanism “trips”.
The detecting mechanism consists of an armature
suspended on a flexure pivot that is restrained from
motion by a permanent magnet (the holddown
magnet). In the “armed” condition, the armature is
held against the stop pin by the holddown magnet.
The stop-pin maintains a precise air gap between the
armature and the holddown magnet. On the opposite
end of the armature, the compression spring provides
an adjustable force to oppose the force of the
holddown magnet. Whenever the peak vibration
inertial force (mass x acceleration) plus the adjustable
compression spring force exceeds the force of the
holddown magnet, the armature is released and is
pulled into the latching magnet (“tripped position”).
Simultaneously, it activates the snap-action switch.
This detecting mechanism has a uniform response
from 0 to 300 Hz over a range of 0 to 4.5 g’s.
The mechanism may be reset to the “armed” position
manually (locally) or electrically (remotely). Manually,
depress the reset button to move the armature away
from the latching magnet (“tripped” position) until it is
held against the stop pin (“armed” position).
Electrically, the reset coil may be energized to pull the
armature into the “armed” position against the stop pin.
A reset and holding coil is provided, in the DC/AC
voltage as specified, so that accidental shutdowns on
starts can be prevented. External time-delay relay
circuits are required to maintain voltage at the holding
coil during startup period and then release this voltage
when operation is normal. At full voltage the reset coil
should not be energized for more than four minutes to
prevent overheating. Then, the reset coil must be de-
energized for a period of ten minutes before re-
energizing. For longer hold-in requirements the reset
coil should be energized at full voltage and then held-
in at one-half the rated voltage.
The Vibraswitch may be used in conjunction with the
Vibraswitch Monitor, Model 563A. This monitor is a
solid-state electronic system designed to “sort-out”
false signals received by the Vibraswitch so that Alarm
and/or Shutdown of the operating machine will not
result from false, transient disturbances. Examples of
transient disturbances are the closing of pipeline check
valves on pumping applications, the start-up of
additional pumps on a line, and the initial start-up of
various operating machines. These disturbances may
cause the Vibraswitch to “trip-out” if the vibratory shock
level is in excess of its setpoint.
The purpose of the Vibraswitch Monitor is to
“supervise” and “sort-out” the transient disturbances so
that Alarm or Shutdown is not falsely imposed on the
machine being monitored, but any continuous vibration
level which exceeds the Setpoint of the Vibraswitch will
cause Alarm and/or Shutdown.
Figure 4-1
Operating Principal for the Vibraswitch
4.2 ADJUSTMENTS OF SETPOINT
The operating setpoint for the Vibraswitch varies with
the type of machine and its location (measurement
point) on the machine. The setpoint adjustments
suggested in this manual are for machines which are
functioning in a “good” or “normal” condition. This
method follows the concept of vibration tolerance for
the machine and in this case is dependent upon an
individual who is experienced in the operation of the
machine vibration as “normal”, “fair”, “slightly rough”,
etc. These various degrees of machine vibration are
therefore, based on the individual’s physical perception
between normal and abnormal roughness while the
machine is operating.
It is agreed that this method can lead to differences in
the classification of degree of vibration between
individual observers. It is Robertshaw’s contention,
and experience bears out this conclusion, that if the
machine is operating satisfactorily as previously
defined and the acceleration as measured by the
Vibraswitch is within certain limits, the settings as
outlined in the instructions will offer protection to the
machine and prevent catastrophic failure.
For example, assume that a relatively new machine
which, in the experience of the operator, is operating
as “smooth” or “good” regarding vibration and the
Vibraswitch measures this acceleration level to be 0.25
g above its static condition (zero). Experience
suggests that a reasonable level for alarm conditions
would be a minimum of twice this value or 0.5 g. It
S E T P OIN T
AD JU STM E NT S CR EW
COMPRESSION
SPRI N G
LEAF SPRING
ARMATU R E
SENSITIVE AXI S RESET B U T TO N
L AT C HI N G M A G N E T
H O L DO W N M A G N E
T
AIR G A P
STOP PIN
RESET C OI L
FLE XURE PI
V
O T
SWI TCH

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 10 -
must be acknowledged that such a definition of upper
vibration limits (alarm condition) on the machine may
not have adequately defined the upper tolerance limit
of the machine before major repairs or excessive
machine damage. It does, however, define a limit
which, in our experience, has proven to be safe. As
the user becomes more adept in using the Vibraswitch
as a monitoring device, his experience may dictate a
higher setpoint, more in keeping with the experience
he has gained on the particular machine.
The Vibraswitch is adjusted by a simple three-step
procedure (ref. Figure 4-2).
a. Zero Vibration Level Measurement
With the equipment on which the Vibraswitch is
mounted not operating, back off the Setpoint adjusting
screw counterclockwise (CCW) two turns and press
the reset button. Then turn the Setpoint adjusting
screw slowly clockwise (CW) until actuation occurs
(the armature assembly is against the latch magnet,
Figure 4-1). This is the zero vibration point, or
actuating point, with the machine not operating. A
mark should be made with a lead pencil or other
convenient means to permanently record this “zero”
vibration point. Subsequent measurements are made
relative to this point.
NOTE
b. Normal g-level Measurements
With the machine (equipment) operating, back off the
Setpoint adjusting screw one turn counterclockwise
(CCW) and press the reset button. If the Vibraswitch
will not reset, back off the Setpoint adjusting screw two
turns counterclockwise (CCW) etc. Again turn the
Setpoint adjusting screw slowly clockwise (CW) until
actuation occurs. Mark this position with a lead pencil
or other convenient means. The difference between
the two actuating points in Steps “a” and “b” is
the normal g-level of the operating machine, in
scale divisions. One scale division is approximately
0.1 g; one full turn is approximately 1.0 g.
c. Final Setpoint Adjustment
If the “normal” g-level is less than 1.0 g above the zero
level, rotate the Setpoint adjusting screw
counterclockwise (CCW) 0.5 g (five graduations) from
the point where actuation occurs in Step “b” above. If
the “normal” g-level is greater than 1.0 g refer to
Figure 4-3 for the proper Final Setpoint setting with
respect to the “normal g-level vibration point” obtained
in Step “b”. See example in Figure 4-3.
TYPICAL PENCIL MARK
TO INDICATE ZERO
VIBRATION POINT
SETPOINT
ADJUSTING SCREW
DIRECTION OF INCREASED
(HIGHER VIBRATION) SET POINT
Each scale division is approximately 0.1 g.
Each full revolution is approximately 1 g.
Figure 4-2
Setpoint Adjustment
Actuation can be heard as an audible “click”. In
noisy surroundings it may be necessary to use an
ohmmeter or wire the Vibraswitch to the control
circuit to tell when actuation occurs.

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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0
5.0
4.5
4.0
3.5
3.0
0.5
1.0
1.5
2.0
2.5
5.04.54.03.53.00.5 1.0 1.5 2.0 2.5 5.5 6.0
(b)
(a)
N
O
R
M
A
L
G
-
L
E
V
E
L
M
E
A
S
U
R
E
M
E
N
T
FINAL SETPOINT SETTING (G)
ZERO POINT
MINIMUM SETPOINT SETTING
(Maximum protection for machine)
OPTIMUM SETPOINT SETTING
(Good protection for machine)
MAXIMUM SETPOINT SETTING
(Minimum protection for machine)
EXAMPLE: If the Normal G-Level (a) is 2.8 g above the Zero Vibration Level, the Final Setpoint Setting (b)
should be set at 3.5 g above the Zero Vibration Level. Therefore, advance the Setpoint
Adjusting Screw CCW 0.7 g (3.5 g – 2.8 g = 0.7 g) or 7 scale divisions (one scale division is 0.1
g) from the Normal G-Level.
Figure 4-3
Setpoint Alarm Settings

MODEL 365A & E365A VIBRASWITCHES 909GF294G
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Section 5 - MAINTENANCE
5.1 TROUBLE SHOOTING
Vibraswitches do not normally require any repair;
however, listed below are some of the possible
malfunctions that may occur and their recommended
solutions. NOTE
a. Functional Test (Ref. Figure 4-1)
This test may be performed with the Vibraswitch in
its housing or removed from its housing. Therefore,
it is not necessary to remove the housing from the
machine.
1. Place the Vibraswitch on a table with the
mounting surface or terminal blocks down on the
table (setpoint adjusting screw and reset button
facing up).
2. Press the reset button. If switch does not reset
(armature latched on stop pin), turn setpoint
adjustment screw CCW until switch can be
manually reset.
3. Slowly turn setpoint adjusting screw CW until
switch trips. This is the zero trip point which is the
amount of spring tension required to overcome the
1 g force exerted by the earth’s gravitational pull.
4. Note set point setting. One complete turn
equals approximately 1 g. Setpoint scale is marked
in 0.1 g increments. Turn setpoint adjustment
screw one complete turn CCW. This is a 1 g
setting above the earth’s gravitational pull.
5. Manually reset the switch (press reset button).
6. With the reset button to your left and the
Setpoint adjustment screw to your right, slowly
rotate the Vibraswitch toward you 90°. The switch
should trip when the mounting surface or terminal
block is in a vertical plane and the earth’s
gravitational pull is not aiding the holddown (lower)
magnet to hold the armature against the stop pin.
If the Vibraswitch does not pass the above test
contact the nearest Robertshaw sales
representative for repair or replacement of the
Vibraswitch.
b. Vibraswitch Will Not Reset
1. Dirt and/or metal chips on magnet –
Clean magnets without removing or rotating them.
2. Reset Assembly Binding –
Check for interference from switch insulator.
3. Broken Leaf Spring (Ref. Figure 4-1) –
Not repairable in the field. Contact the nearest
Robertshaw sales representative for repair or
replacement of the Vibraswitch.
4. Open Reset Coil –
Check for continuity and proper coil resistance as
specified in Table 5-1.
Table 5-1
Reset Coil Resistance
NOMINAL
VOLTAGE RESISTANCE
(OHMS ±10%)
24 VDC 55
48 VDC 230
117 VDC 850
120 VAC
240 VAC Check for continuity. (Diode prevents actual resistance reading)
If coil fails continuity/resistance check replace coil
or contact the nearest Robertshaw sales
representative for repair or replacement of the
Vibraswitch.
c. Unable to adjust Setpoint Setting to Obtain
Tripping
Improper air gap between Holddown (lower)
Magnet and Armature –
Not repairable in the field. Contact the nearest
Robertshaw sales representative for repair or
replacement of the Vibraswitch.
d. Switch does not actuate
Defective switch –
Verify by manually moving the Armature between the
latched (tripped) position and the armed (reset)
position and listen for an audible click of the switch.
Verify contact by performing a continuity check.
If the internal switch is to be replaced or adjusted in
the field make sure that the actuation point occurs at
mid travel of the armature (lever).
Whenever tightening cover bolts tighten to 75 – 105
inch lbs (8.5 – 11.9 Nm).

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 13 -
5.2 REPLACEMENT PARTS
5.3 REPAIRS
In some cases it may be necessary to replace parts in
the field. When this is the case only the parts listed in
Table 5-2 should be replaced in the field. All other
parts require replacement by technicians experienced
in the repair of Vibraswitches. Contact the nearest
Robertshaw sales representative for repair or
replacement of the Vibraswitch.
Warning - when replacing parts in the field, do not
remove or readjust the magnets, stop pin, leaf springs,
armature or any parts associated with the armature.
(See Figure 4-1.)
If an internal switch is to be replaced, the new switch
should be adjusted so that it trips when the armature
(lever) is at mid travel.
Table 5-2
Replacement Parts
PART DESCRIPTION USED ON MODEL PART
NUMBER
Button, Reset* ALL 420KB035-01
Cap Screw, Cover (4 used per unit) ALL 435KB157-38
Coil, Reset, 24 VDC 365A-A2, E365A-A2 160KB044-03
Coil, Reset, 24 VDC 365A-D2, 365A-G2, E365A-D2, E365A-G2 160KB047-03
Coil, Reset, 48 VDC 365A-A4, E365A-A4 160KB044-02
Coil, Reset, 48 VDC 365A-D4, 365A-G4, E365A-D4, E365A-G4 160KB047-02
Coil, Reset, 117 VDC 365A-A7, E365A-A7 160KB044-07
Coil, Reset, 117 VDC 365A-D7, 365A-G7, E365A-D7, E365A-G7 160KB047-06
Coil, Reset, 120 VAC / 240 VAC 365A-A3, 365A-A8, 365A-D3, 365A-G3, E365A-A8 160KB044-06
Coil, Reset, 120 VAC / 240 VAC 365A-D8, 365A-G8, E365A-D8, E365A-G8 160KB047-05
Decal, Reset Button ALL 159KB119
O-Ring, Cover Sealing ALL 560KB083
Resistor, 240 VAC Reset Coil Circuit 365A-( )3 260KB106-06
Resistor, Space Heater, 12 V 365A-A, E365A-A 260GG255
Resistor, Space Heater, 12 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-01
Resistor, Space Heater, 24 V 365A-A, E365A-A 260GG220
Resistor, Space Heater, 24 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-02
Resistor, Space Heater, 48 V 365A-A, E365A-A 260GG359
Resistor, Space Heater, 48 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-03
Resistor, Space Heater, 117/120 V 365A-A, E365A-A 260GG453
Resistor, Space Heater, 117/120 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-04
Resistor, Space Heater, 240 V 365A-A, E365A-A 260GG469
Resistor, Space Heater, 240 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-05
Resistor, Space Heater, 460 V 365A-A, E365A-A 260GG559
Resistor, Space Heater, 460 V 365A-D, 365A-G, E365A-D, E365A-G 904GC402-06
Screw, Setpoint Adjustment ALL 435KB258-01
Switch, Type “A” 365A-A, E365A-A 909GM142-07
Switch, Type “D” 365A-D, E365A-D 900SA647-02
Switch, Type “G” 365A-G, E365A-G 900SA726-03
Varistor, 120 VAC 365A-A8, E365A-A8 260KB183
Varistor, 120 VAC 365A-D8, 365A-G8, E365A-D8, E365A-G8 904GC341
Varistor, 240 VAC 365A-A3 260KB183-03
Varistor, 240 VAC 365A-D3, 365A-G3 904GC341-01
Washer, Flat, Cover (4 used per unit) ALL 447GB116
* When ordering the reset button, 420KB035-01, also order the Reset Button Decal, 159KB119.

MODEL 365A & E365A VIBRASWITCHES 909GF294G
- 14 -
5.4 ROUTINE MAINTENANCE
Vibraswitches do not normally require any
maintenance, however, a periodic simple functional
test and visual inspection is recommended. This
should be performed at least once a year.
Functional tests and visual inspections should be
performed with all power to the Vibraswitch
disconnected and the equipment on which the
Vibraswitch is mounted not running.
a. Simple Functional Test
1. Remove the Vibraswitch from the housing.
2. Note the position of the Setpoint adjusting
screw.
3. Press the reset button to make sure that the
Vibraswitch is in the armed position.
4. Slowly turn the Setpoint adjusting screw CW
until the switch trips. This can usually be
determined by hearing an audible click.
5. Rotate the Setpoint adjusting screw CCW until it
is in the original position.
6. Press the reset button. The Vibraswitch should
now be in the armed (reset) position.
b. Visual Inspection
1. Inspect the Vibraswitch mechanism and housing
interior for signs of corrosion and moisture.
2. Replace the Vibraswitch into the housing.
3. Tighten cover bolts tighten to 75 – 105 inch lbs
(8.5 – 11.9 Nm).
c. Recalibration
This should not be necessary, however, if it is felt
that the setpoint may not be correct refer to
paragraph 4.2.
Q-4174 (11/05) Printed in U.S.A.
U.S.A. & Canada
Robertshaw Industrial Products
1602 Mustang Drive
Maryville, Tennessee 37801
Phone: [phone] Fax: [phone]
http://www.robertshawindustrial.com
Exports
Invensys Controls
1701 Byrd Avenue
P.O. Box 26544
Richmond, Virginia 23261-5644
Phone: [phone] Fax: [phone]