Siemens SITRANS WS300 Service manual

Belt Weighing
Speed Sensors
SITRANS WS300
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■ Overview
SITRANS WS300 is a low- to high-resolution shaft-driven speed
sensor.
■ Benefits
• Light and rugged design, IP65 rated
• Compact and economical
• Easy, low-cost installation
• Accurate belt speed detection
• Optional resolutions for measurement over a range of belt
speeds
• Corrosion resistant
■ Application
SITRANS WS300 speed sensor operates in conjunction with a
conveyor belt scale, providing a signal to an integrator which
computes the rate of material being conveyed. At only 1.22 kg
(2.68 lbs), it is one of the lightest and most durable units ever de-
veloped for monitoring conveyor belt speed. With its rugged
cast aluminium housing, it is suitable for outdoor installation, and
its low weight prolongs bearing life.
It is directly coupled to a rotating tail or bend pulley shaft to en-
sure accurate belt-travel readout, eliminating problems caused
by belt slippage or material build-up. The WS300 converts shaft
rotation into a pulse train of 32, 256, 1000, or 2000 pulses per
revolution using a high precision rotary optical encoder. The dig-
ital signal is transmitted as speed input to any Siemens integra-
tor for calculation of belt speed, flow rate and totalized weight.
This low- to high-resolution speed sensor provides a frequency
signal proportional to the shaft speed, enabling a range of
speeds to be read accurately. The quadrature type shaft en-
coder prevents erroneous speed signals due to vibration or shaft
oscillation. The WS300 is easily mounted and is bi-directional for
either clockwise or counter-clockwise belt travel.
The IS version uses an inductive proximity switch detecting ro-
tating targets.
© Siemens AG 2010

Belt Weighing
Speed Sensors
SITRANS WS300
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■ Design
Mounting
WS300 mounting
Mounting using optional threaded shaft coupling
WS300 mounting using threaded shaft coupling
angle bracket slotted
for arrestor rod
³10 mm (0.375”)
89 mm
(3.5”)
dtension spring (supplied)
tension spring (supplied)
bend or snub pulley
tension spring (supplied)
10 mm (3.8”)
drilled hole
belt
belt
WS300
WS300
WS300
angle bracket slotted
for arrestor rod
flexible conduit
tension spring (supplied)
stringer
stringer
arrestor rod (cut to suit)
arrestor rod (cut to suit)
flexible conduit
flexible conduit
pulley bearing
flexible conduit
89 mm
(3.5”)
Mounting to a Tail Pulley Mounting to a Bend or Snub Pulley
Notes:
Distance ‘d’ is the take-up travel on the tail pulley.
When adjusting the belt take-up, ensure that there is play on the arrestor rod.
If the arrestor rod is pushed against the end of its travel slot, premature bearing wear may result.
Notes:
When mounting to a bend or a snub pulley only,
a 3/8” (10 mm) drilled hole is required for the arrestor rod.
© Siemens AG 2010

Belt Weighing
Speed Sensors
SITRANS WS300
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■ Technical specifications
Mode of operation
Measuring principle Standard: pulse from shaft rota-
tion using high precision rotary
optical encoder
IS: pulse from inductive proximity
switch
Typical application When a low- to high-resolution
speed sensor is required
Input Shaft rotation 0.5 to 2000 rpm,
bi-directional, resolution depen-
dent
Output • Unidirectional open collector
sinking output
• standard: +10 to +30 V DC,
25 mA max.
• IS: load current, 0 to 15 mA
• 32, 256, 1000, or 2000 pulses
per revolution (ppr)
• 32 ppr: 2000 max. rpm,
1066 Hz
• 256 ppr: 2000 max. rpm,
8530 Hz
• 1000 ppr: 900 max. rpm,
15000 Hz
• 2000 ppr: 450 max. rpm,
15000 Hz
Rated operating conditions
Ambient temperature Standard:
-40 to +55 °C (-40 to +131 °F)
IS:
-25 to +60 °C (-13 to +140 °F)
Degree of protection NEMA 4X, Type 4X, IP65
Design
Enclosure • Rated NEMA 4X, Type 4X, IP65
• Painted aluminum
• Stainless Steel (Optional)
Power supply • Standard: +10 to +30 V DC,
60 mA max.
• IS: +5 to +16 V DC, 25 mA max.
(from IS Switch Isolator)
Cable
Recommended • Standard: 3-wire shielded,
0.82 mm2(18 AWG)
• IS: 2-wire shielded 0.324 mm2
(22 AWG)
• Max. run 305 m (1000 ft)
Approvals
WS300 Standard
General • CE, C-TICK
Hazardous • CSA/FM Class II, Div.1,
Groups E, F, G; Class III
• ATEX II 2D Ex tD A21 IP65
T70 °C
• IECEx Ex tD A21 IP65 T70 °C
WS300 IS (with suitable IS switch
isolator or switch amplifier)1)
General • CE, C-TICK
Hazardous • IS Rating based on Switch and
Isolator Approvals below
Proximity Switch Approval Ratings
(Pepperl+Fuchs #NJ0.8-5GM-N)
• ATEX II 2G EEx ia IIC T6
• CSA/FM Class I, Div. 1, Groups
A, B, C, D; Class II, Div. 1,
Groups E, F, G
(system approval)
Optional Switch Isolator (required
for WS300 IS) 2)
(Pepperl+Fuchs #KFA5-SOT2-Ex2
or #KFA6-SOT2-Ex2)
• ATEX II (1) G [EEX ia] IIC
• CSA/FM: Class 1, Div. 1, Groups
A, B, C, D; Class II, Div. 1,
Groups E, F, G
1) Approvals for WS300 IS are based on internally mounted NAMUR proximity
switch (Pepperl+Fuchs #NJ0.8-5GM-N) and use of suitable IS Switch Iso-
lator (Amplifier). Please see WS300 instruction manual for more informa-
tion.
2) Approval ratings for the Proximity Switch and IS Switch Isolator are the
property of Pepperl+Fuchs. Copies of these Approval Certificates may be
obtained at http://www.siemens.com/continuous-weighing.
© Siemens AG 2010

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Speed Sensors
SITRANS WS300
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C) Subject to export regulations AL: N, ECCN: EAR99.
Selection and Ordering data Order No.
SITRANS WS300 Speed Sensor
A medium- to high-resolution shaft-driven speed
sensor used used with Milltronics belt scales.
C)
7MH7177-
777770
Resolution (pulses per revolution)
32 1
256 2
1000 3
20001) 4
Enclosure
Polyester painted aluminum, NEMA 4X A
304 (1.4301) stainless steel, NEMA 4X B
Approvals
CSA/FM Class II, Div. 1, Groups E, F, G and
Class III
ATEX II 2D, Ex tD A21 IP65 T70 °C, CE, C-TICK,
IECEx, Ex tD A21 IP65 T70 °C
A
CSA/FM Class I, Div. 1, Groups A, B, C, D, and
Class II, Div. 1, Groups E, F, G, ATEX II 1G, EEx ia
IIC T6, CE, C-TICK2) 3)
B
CE, C-TICK D
Connections
Standard, up to 2 integrators 1
Multiple, up to 10 integrators 2
Switch Isolator
Not required 0
115 V AC 1
230 V AC 2
Further designs Order Code
Please add "-Z" to Order No. and specify Order
code(s).
Acrylic coated, stainless steel tag [13 x 45 mm
(0.5 x 1.75")]: Measuring-point number/identifica-
tion (max. 16 characters), specify in plain text
Y17
Acceptance test certificate: Manufacturer's test
certificate M to DIN 55350, Part 18 and ISO 9000
C11
Operating Instructions Order No.
English C) 7ML1998-5ML01
German C) 7ML1998-5ML31
Note: The Operating Instructions should be
ordered as a separate item on the order.
Spare parts
Circuit card 32 PPR, up to 2 integrators 7MH7723-1GK
Circuit card 32 PPR, up to 10 integrators 7MH7723-1GL
Circuit card 256 PPR, up to 2 integrators 7MH7723-1GM
Circuit card 256 PPR, up to 10 integrators 7MH7723-1GN
Circuit card 1000 PPR, up to 2 integrators 7MH7723-1GP
Circuit card 1000 PPR, up to 10 integrators 7MH7723-1GQ
Circuit card 2000 PPR, up to 2 integrators 7MH7723-1JL
Circuit card 2000 PPR, up to 10 integrators 7MH7723-1JM
Circuit card 32 PPR, IS 7MH7723-1HC
Rubber coupling 7MH7723-1CM
Coupling hub for 32, 256 PPR versions 7MH7723-1CN
Coupling hub for 1000, 2000 PPR versions 7MH7723-1GR
Enclosure cover 7MH7723-1CJ
Enclosure bearing assembly 7MH7723-1CK
Enclosure cover, stainless steel 7MH7723-1GS
Enclosure bearing assembly, stainless steel 7MH7723-1GT
Threaded shaft coupling 7MH7723-1GH
Arrestor rod 7MH7723-1FV
Cable for speed sensor connection to termination
box (order per meter)
7MH7723-1JP
Cable for IS speed sensor connection to termina-
tion box (order per meter)
7MH7723-1JQ
Pepperl+Fuchs IS switch isolator, 115 V AC 7MH7723-1EB
Pepperl+Fuchs IS switch isolator, 230 V AC 7MH7723-1EC
1) Available with Approval option D only
2) The Approval Ratings for the Proximity Switch and the IS Switch Isolator are
the property of Pepperl+Fuchs. For current approvals, go to:
http://www.am.pepperl-fuchs.com.
3) Approval option B requires use of Switch Isolator to interface with the belt
scale integrator, and is available with Resolution option 1, and Connections
option 1 only.
Selection and Ordering data Order No.
SITRANS WS300 Speed Sensor
A medium- to high-resolution shaft-driven speed
sensor used used with Milltronics belt scales.
C)
7MH7177-
7 7 7770
© Siemens AG 2010

Belt Weighing
Speed Sensors
SITRANS WS300
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■ Dimensional drawings
WS300 dimensions
■ Schematics (Standard)
Connections
• Determine the pulley shaft rotation on the end of the pulley
shaft to which the WS300 is attached.
• If the pulley shaft is rotating clockwise, connect the appropri-
ate wire to terminal 2. If the pulley shaft is rotating counter-
clockwise, connect the appropriate wire to terminal 3.
• Do not connect terminals 2 and 3 at the same time.
• Connection between the WS300 standard unit and the integra-
tor should be made with three-wire shielded, 0.82 mm2
(18 AWG) cable.
• Ground shield of cable at integrator only.
• Connect shield to appropriate terminal at the integrator.
Terminal Connections to Siemens Milltronics Integrators
Terminal Connections to SIWAREX FTC Integrator
■ Schematics (IS)
Connections
• Only terminals 1 and 2 are required; rotation in a clockwise or
counter-clockwise direction is not required.
• To connect the switch isolator, use two-wire shielded
0.324 mm2(22 AWG) cable. Use the same cable to connect
the switch isolator to the integrator.
• Ground shield of cable at integrator only.
• Connect shield to appropriate terminal at the integrator.
Terminal Connections to Siemens Milltronics Integrators
Terminal Connections to SIWAREX FTC Integrator
Connect CI- to Common
Description Terminal
+10 to +30 V DC 1
speed out-CW 2
speed out-CCW 3
common 4
ground GND
WS300 1
+V
2
CW
3
CCW
4
Cmn
GND
Milltronics BW100 8 7 7 6 N/C
Milltronics BW500 19 16 16 17 N/C
WS300 1
+V
2
CW
3
CCW
4
Cmn
GND
SIWAREX FTC 24 V
(back-
plane
bus
X1.9
(CI+)
X1.9
(CI+)
X1.10
(CI- and
Com-
mon)
N/C
Description Terminal
+5 to +16 V DC, 25 mA max.
(from IS Switch Isolator)
1
speed out 2
ground GND
WS300 IS IS Switch Isolator
Terminal
Integrator
11
2 3
7speed signal input
8- excitation
WS300 IS IS Switch Isolator
Terminal
FTC
11
2 3
7 CI+
8IL+
© Siemens AG 2010