Nexen Nexsafe RLSSB-S User manual

1FORM NO. L-21699-B-1120
FORM NO. L-21699-B-1120
Safety Rated Rod/Shaft Lock
Spring Engaged, Air Released
RLSSB-S (Stand Alone)
RLSSB-C (Cylinder Mount)
RLSSB-C-MR (Cylinder Mount with Manual Release)
RLSSB-S-MR (Stand Alone with Manual Release)
LINEAR MOTION CONTROL PRODUCTS
User Manual
safe
™
Certified Safety Products

2
FORM NO. L-21699-B-1120
Copyright 2020 Nexen Group, Inc.
Nexen Group, Inc.
560 Oak Grove Parkway
Vadnais Heights, Minnesota 55127
ISO 9001 Certified
This document is the original, non-translated, version.
Conformity Declaration: In accordance with Appendix II B of CE Machinery Directive (2006/42/EC):
A Declaration of Incorporation of Partly Completed Machinery evaluation for the applicable EU directives was
carried out for this product in accordance with the Machinery Directive. The declaration of incorporation is set
out in writing in a separate document and can be requested if required.
This machinery is incomplete and must not be put into service until the machinery into which it is to be
incorporated has been declared in conformity with the applicable provisions of the Directive.
Read this manual carefully before installation and operation.
Follow Nexen’s instructions and integrate this unit into your
system with care. This unit should be installed, operated and
maintained by qualified personnel ONLY. Improper installation
can damage your system, cause injury or death. Comply with
all applicable codes.
DANGER
In accordance with Nexen’s established policy of constant product improvement, the specifications contained in this manual
are subject to change without notice. Technical data listed in this manual are based on the latest information available at
the time of printing and are also subject to change without notice.
Technical Support: 800-843-7445
[phone]
www.nexengroup.com

3FORM NO. L-21699-B-1120
Table of Contents
General Specifications ------------------------------------------------------------------------------------------------------------------------- 4
General Safety Precautions ------------------------------------------------------------------------------------------------------------------ 4
Product Description ------------------------------------------------------------------------------------------------------------------- 5
Safety Standard Compliance ----------------------------------------------------------------------------------------------------------------- 6
Transport, Handling & Storage --------------------------------------------------------------------------------------------------------------- 6
Installation ------------------------------------------------------------------------------------------------------------------------------------------- 7
Rod Material ---------------------------------------------------------------------------------------------------------------------------------------- 8
Lubrication ------------------------------------------------------------------------------------------------------------------------------------------- 8
Optional Operating Mode Sensor(s) ---------------------------------------------------------------------------------------------------------- 9
Rod Lock Air Connections ------------------------------------------------------------------------------------------------------------------- 10
Air Controls and Programming --------------------------------------------------------------------------------------------------------------- 11
Manual Release ------------------------------------------------------------------------------------------------------------------------------------ 12
Service ------------------------------------------------------------------------------------------------------------------------------------ 12
Troubleshooting ------------------------------------------------------------------------------------------------------------------------------------ 13
Warranty ------------------------------------------------------------------------------------------------------------------------------------------- 14

4
FORM NO. L-21699-B-1120
GENERAL SPECIFICATIONS
Specifications:
Holding Force Up to 22350 N (5026 lbs)
Actuation Pressure 1 - 5.5 bar (14.5 - 120 psi)
External Temp. Limits 4.5 - 65.5 C (40 - 150 F)
Approximate Weight Up to 29.5 kg (65 lbs)
GENERAL SAFETY PRECAUTIONS
CAUTION
Use lifting aids and proper lifting
techniques when installing, removing,
or placing this product in service.
CAUTION
Do not exceed the maximum holding force
of the unit. The locking function will be
overloaded, causing rod slip and possible
damage to the shaft and product.
CAUTION
Watch for sharp features when
interacting with this product. The
parts have complex shapes and
machined edges.
CAUTION
Do not use a Rod Lock to stop a rotating
shaft. This product is not intended for
torsional braking or frequent dynamic
braking.
WARNING
Ensure proper guarding of the product is
used. Nexen recommends the machine builder
design guarding in compliance with OSHA 29
CFR 1910 “Occupational Safety and Health
Hazards”.
Do not engage the Rod Lock without
a properly sized rod in place or
damage to the internal components
may result.
CAUTIONCAUTION
Do not attempt to disassemble this
product. Product components are
spring-loaded and can cause serious
injury.
Figure 1 Caution
WARNING
Keep indoors. This product is
intended for indoor environments
only. Use of the brake outdoors will
damage components. No Excessive
Dust or humidity permitted.

5FORM NO. L-21699-B-1120
PRODUCT DESCRIPTION
The Rod Lock has been developed for locking and holding on the shaft of an air cylinder or guide rod. These spring engaged,
air released units are designed to hold in a safe position by default. Brakes are intended for static holding applications
and Emergency Stop situations.
The proper installation and maintenance of these rod locks must be observed to prevent damage to unit or improper use of unit.
Engaged State: In the engaged state, several compression springs push on the piston causing the clamping collar to lock
onto the rod. If air pressure is lost the unit will default to the brake engaged state.
Disengaged State: When air pressure is applied, the piston will push back against the springs, releasing the clamping
collar from the rod. Manual release units are also equipped with a cam operated manual release
feature to mechanically disengage the rod lock
A series of equally spaced compression springs provide the rod lock actuating force. Dozens
of ball bearings separate a split, tapered collar and piston. The piston travels up the ramp on
the collar under spring force and causes the split collar to constrict on the rod. Air pressure
applied to the opposite side of the piston compress the springs to release the grip on the rod.
Select models have a manual release feature to disengage the rod lock without air pressure.
The mechanism is cam operated, turned with a wrench and is a “default-to-lock” function. As
long as a force is applied to the wrench the rod lock is disengaged. With no force applied the
rod lock “defaults” to the engaged position.
NOTE
PISTON
COMPRESSION
SPRINGS
BREATHER VENT
AIR INLET
BALL BEARINGS
SPLIT COLLAR
MANUAL
RELEASE
HEX NUT
MANUAL
RELEASE CAM
Figure 2 Principle of Operation

6
FORM NO. L-21699-B-1120
SAFETY STANDARD COMPLIANCE
ISO 13849 is a Safety Standard which applies to machines and systems, and aims to reduce risk, in event of machine
failure. This section clarifies our Rod Lock’s intended use as a part of a system or machine that must comply with this
standard.
Rod Locks intended for safety related applications are to be installed in accordance with the required performance level/
category level per ISO 13849-1:2015. The category rating of safety channels and performance level of the machine is
the responsibility of the system manufacturer. For fulfillment of the safety function, the Rod Lock is to be viewed as an
individual component.
Braking Function: All safety rated Rod Locks use multiple Compression springs to provide the necessary spring force
over the life of the unit. The use of multiple springs ensures that a reduced locking force will be
available in the event of spring failure.
Safety Guidelines: Adhere to the guidelines for safe and reliable locking and error-free operation:
• Rod Lock is required to be installed and maintained per this literature
• Observe intended use of the Rod Lock
• Rod Lock sized and applied correctly per system requirements
• Rod Locks are to be selected and integrated into the safety machine
in accordance with ISO 13849-1:2015 by the system manufacturer.
TRANSPORT, HANDLING & STORAGE
During transport, the product will be in the default (engaged) position with a dummy rod inserted, eliminating the possibility
of parts shifting. Rod Locks can be handled without the use of special equipment.
Nexen products have a shelf life of 7 years beginning on the date of packaging serialization located on the original shipping
container of the item.
The following criteria must be maintained to achieve full shelf life of the product:
1. Original packaging must remain unopened and intact.
2. Product must have been stored in a temperature and humidity controlled environment.
• Temperature range of 65°F ±15°F (18.3°C ±8.3°C)
• Relative humidity range of 35%-55%
Specification Deviation Effect on Safety Function
Air pressure too high Unit will leak, not hold force
Air pressure too low Fail to disengage
Apply too much force Will not hold applied force and will slip
Exceed environmental specs Not operate as intended
Refer to table below for effects on safety if Rod Lock is used outside of Nexen specification range.
safe
™
Certified Safety Products

7FORM NO. L-21699-B-1120
1. Apply a constant supply of air, with a minimum of 4.1
bar (60 psi) air pressure to open (release) the Rod
Lock. Manual release option; apply the appropriate
amount of torque to the manual override mechanism
to open (release) the Rod Lock.
INSTALLATION
2. Remove the supplied rod from the inside of the Rod
Lock and keep for future use.
3. Carefully slide the Rod Lock over the cylinder rod
or guide rod, past the seal(s) and through the entire
assembly. Note: Cylinder (“C”) mounts, skip to
instruction #5.
4. “S” (stand-alone) series: Remove the air pressure to
engage the Rod Lock on the guide rod when it is in the
desired position.
5. “C” (cylinder mount) series: Carefully slide the Rod
Lock onto the cylinder rod toward the cylinder end cap.
The Rod Lock is piloted and sealed to the gland O.D.,
so some force is required. Press the Rod Lock onto
the end cap face as close as possible.
6. Using a corner-to-corner sequence, install and tighten
the mounting screws or tie rod nuts to approximately
75% of the final tightening torque. (See Table 1)
7. Using a calibrated torque wrench, tighten the fasteners
or nuts to the final torque specification using the same
corner-to-corner sequence. Ensure all fasteners are
fully tightened.
8. Remove the air pressure to engage the Rod Lock on
the cylinder rod.
NOTE: “Rod” and “Shaft” refer to the same feature and
are used interchangeably.
The “S” (stand-alone) series Rod Locks are designed to
mount on round guide rods and are typically mounted in
accordance with the design of the machine.
The “C” (cylinder) series Rod Locks are designed to
mount directly to NFPA or ISO flush-mount air cylinders.
The “C” -mounted Rod Locks come with (4) mounting
screws. These screws are used to attach the Rod Lock
to cylinders with tapped holes in the interface or with
socket head, sleeve nuts. The mounting screws are not
necessary on cylinders equipped with threaded tie rods
/ nuts. Cylinders should be prepared with enough rod
length and tie rod length (if appropriate) to accommodate
the rod lock length.
NOTE: Eight inch Rod Locks do not come with
mounting screw assemblies. Fasten the rod lock to
the cylinder with longer threaded tie rods and nuts.
See Figure 3.
32MM to 6” Bores
8” Bores
Figure 3
Rod Lock Inch-Pounds Nm
RLSSB 150-063 32-36 3.6-4.1
RLSSB 200-063 72-82 8-9
RLSSB 200-100 72-82 8-9
RLSSB 250-063 72-82 8-9
RLSSB 325-100 216-228 24-25.3
RLSSB 400-100 216-228 24-25.3
RLSSB 400-138 216-228 24-25.3
RLSSB 500-100 360-372 41-42
RLSSB 500-138 360-372 41-42
RLSSB 600-138 420-432 48-49
RLSSB 600-175 420-432 48-49
RLSSB 032-012 30-38 3.4-4.3
RLSSB 040-016 30-38 3.4-4.3
RLSSB 050-020 66-100 7.5-11.3
RLSSB 063-020 66-100 7.5-11.3
RLSSB 080-025 156-230 18-26
RLSSB 100-025 156-230 18-26
RLSSB 125-032 400 45
Table 1 Fastener or Tie Rod Torque
CAUTION
Do not engage the Rod Lock without a
properly sized rod in place or damage to
the internal components may result. Refer
to the Rod Material section.

8
FORM NO. L-21699-B-1120
NOTE
Nexen pneumatically actuated devices require clean, pressure regulated air for maximum performance and life.
All seals in Nexen pneumatically operated devices are lubricated for life, and do not require additional lubrication.
However, some customers prefer to use an air line lubricator, which injects oil into the pressurized air, forcing
an oil mist into the air chamber. This is acceptable, but care must be taken to ensure once an air mist lubrication
system is used, it is continually used over the life of the product as the oil mist may wash free the factory
installed lubrication.
Locate the lubricator above and within ten feet of the product, and use low viscosity oil such as SAE-10.
Synthetic lubricants are not recommended.
Nexen product’s bearings are shielded and pre-lubricated, and require no further lubrication.
ROD MATERIAL
• Nexen strongly recommends the following rod material
for cylinder rods and guide rods. Deviations from these
specifications will result in poor rod lock performance
and shaft damage.
Hardness Specification Hard Chrome
Plating Thickness
Less than 52 HRC 20 microns
[0.0008 inch]
Greater than 52 HRC 8-3 microns
[0.0003- 0.0005 inch]
• The diameter should lie in the h8 tolerance range.
Reference: USAS B4.1 - 1967(1974)
ISO 286-1 - 1988
ISO 286-2 - 1988
• The rod must be clean and dry to maintain optimum
holding forces.
• The surface roughness Rmax should be 1.6 microns
[63 micro-inch] or better.
• The rated holding force corresponds to static load
conditions. If the rated value is exceeded, slippage may
occur. Operating dynamic forces must not exceed the
static holding force.
CAUTION
Nexen’s Static Rod Lock is suitable for
infrequent dynamic braking (emergency stops)
when used with hardened shaft material
Repeated dynamic stops may cause rod and/
or collar wear, reducing holding forces.
1. Close and disconnect the air line from the unit.
2. Turn the Lubricator Adjustment Knob counterclockwise
three complete turns.
3. Open the air line.
4. Close the air line to the unit when a drop of oil forms
in the Lubricator Sight Gage.
5. Connect the air line to the unit.
6. Turn the Lubricator Adjustment Knob clockwise until
closed.
7. Turn the Lubricator Adjustment Knob counterclockwise
one-third turn.
8. Open the air line to the unit.
LUBRICATION
CAUTION
These settings are for Nexen supplied
lubricators. If you are not using a Nexen
lubricator, calibration must follow the
manufacturer's suggested procedure.
LUBRICATOR DRIP RATE SETTINGS

9FORM NO. L-21699-B-1120
OPTIONAL OPERATING MODE SENSOR(S)
Nexen’s Magnetic Proximity Sensors are available to
gather operational data from the Rod Lock. The Safety
Rated RLSSB can be equipped with one or two T-slots
for sensor mounting.
These sensors may be used by system manufacturers
to gain higher safety category ratings per ISO 13849-1.
Rating of the safety function is the responsibility of the
system manufacturer.
Each Proximity sensor can be set up to sense one of the
following functions of the Rod Lock:
Disengagement Sensor Definition:
Sensor is activated when the rated air pressure is applied
and the piston moves to a disengaged position.
Engagement Sensor Definition:
Sensor is activated when the piston moves out of the
disengaged position into a position in which the clamp
collar constricts on the rod.
SENSOR WIRING
Nexen’s Magnetic Proximity Sensor is available in two
modes, see Table 2. System manufacturer is responsible
for selecting appropriate sensor type for specified safety
application.
PNP Mode (Sourcing)
Normally Open (N.O.) or Normally Closed (N.C.) PNP
type Sourcing Output available, see Figure 5. Typically
matched with a PLC Sinking Input.
NPN Mode (Sinking)
Normally Open (N.O.) or Normally Closed (N.C.) NPN type
Sinking Output available, see Figure 5. Typically matched
with a PLC Sourcing Input.
SENSOR INSTALLATION AND SETUP
Note: Validate sensor functionality in application, including
possible temperature range.
The Rod Lock can be equipped with one or two magnetic
proximity sensors. If two sensors are used, they can be
configured to detect redundant or individual engaged and
/ or disengaged states. If sensors are setup for redundant
detection, the sensor states should always match. If
sensors are setup for individual, opposing detection, the
sensor states should always be opposite. To ensure proper
operation, compare the expected state to the measured
state. Once installed on the rod, Nexen recommends
checking the positioning of the sensor for proper switching
location.
Wire magnetic sensor and insert cable clip into t-slot per
the instructions included with the sensor(s). Provide power
to sensor, and complete the following:
Sensing Disengagement Position:
1. With rod lock on rod, supply air pressure to the rod
lock so it is disengaged.
2. Install sensor as shown in Figure 6. Start with sensor
positioned closest to the back of the rod lock, past the
sensing target. Slide the sensor towards the front end
of the rod lock until LED is lit. Once the LED is lit, move
sensor a small amount further into sensing target.
3. Use a standard flat-head screwdriver or 1.5mm allen
wrench to turn the screw and fix the sensor in the t-slot.
4. Cycle air pressure to ensure the LED is lit only when
release air pressure is supplied to the rod lock.
BK
BU
-
BN
+
LOAD
NPN Mode (Sinking)
NPN Mode (Sinking)
PNP Mode (Sourcing)
BK
BU
BN
LOAD
PNP Mode (Sourcing)
BK
BU
BN
BK
BU
BN
LOAD
LOAD
0 VDC
10-30 VDC
-
+
0 VDC
10-30 VDC
-
0 VDC
+
10-30 VDC
-
0 VDC
+
10-30 VDC
Figure 5
Sensor Wiring
Figure 4
Locking
Mode
Sensor(s)
Sensing
Magnet
Note: Safety Rated Units may have
one or two sensor slots.
Sensing Engagement Position:
1. With rod lock on rod, remove air pressure to the rod
lock so it is engaged.
2. Install sensor as shown in Figure 6. Start with sensor
positioned closest to the front of the rod lock, before
the sensing target is reached. Slide the sensor
towards the back end of the rod lock until LED is
lit. Once the LED is lit, move sensor a small amount
further into sensing target.
3. Use a standard flat-head screwdriver or 1.5mm allen
wrench to turn the screw and fix the sensor in the t-slot.
4. Cycle air pressure to ensure the LED is lit only when
air pressure is removed from the brake.
Figure 66
(Engagement)
(Disengagement)
Sensor Adjustment Direction
Back End of
Rod Lock
Front End of
Rod Lock
LED LightLED Light
on Sensoron Sensor
Note: Ferrous Materials in Close Proximity
may interfere with sensor function.
Normally Open: Normally Closed:

10
FORM NO. L-21699-B-1120
NOTE
For quick response, Nexen recommends a quick
exhaust valve and short air lines between the
Control Valves and the unit. Align the air inlet
ports to a down position to allow condensation
to drain out of the air chambers of the product.
CAUTION
Low air pressure will cause slippage
and damage.
All Nexen pneumatically actuated devices require clean
and dry air, which meet or exceeds ISO 8573.1:2001
Class 4.4.3 quality.
1. Basic Configuration:
Attach a Standard Air Fitting to the Rod Lock. Use
Teflon tape and/or pipe sealant on the threads. This
configuration will have slower response times.
Standard Configuration:
Attach the Quick Exhaust Valve to the Rod Lock. Use
Teflon tape and/or pipe sealant on the threads.
Cable Wire
Color
Valve
24 VDC Valve Pin
DIN Connector
for 964650 (Inch
NFPA Units)
Brown + 1
White - 2
Green Ground Ground
DIN Connector for
964651 (Metric
ISO Units)
Black,Labeled + + 1
Black,Labeled - - 2
Green Ground Ground
Table 3
Optional Solenoid Valve Specifications
Ports Part # Voltage Power Resistance Current Cv
English 964650 24 VDC 4 W 145 ohms .17 A .25
Metric 964651 24 VDC 4.8 W 120 ohms .20 A .915
DANGER
Support the load before disengaging the
Rod Lock. Failure to support the load
could result in serious bodily injury.
CAUTION
24 VDC valve connector has a
suppression diode installed across the
coil. Observe proper voltage polarity or
connector damage will result.
FIGURE 7 Optional Solenoid Valve #964651 (Metric Units)
Exhaust
Silencer
To Quick Exhaust, Brake
Air Supply
Tube Fitting
Manual Override*
(English Units)
DIN
Connector Lead Wires
1/8 NPT (English Units)
1/8 BSPT (Metric Units)
- 1/4” O.D. Tube
(English Units)
- 6mm O.D. Tube
(Metric Units)
Manual Override*
(Metric Units)
CAUTION
The Rod Lock will disengage if you
depress the domed button at the top
of the Solenoid Valve (if air pressure
is applied). The LED will illuminate
when the Solenoid Valve is actuated
and the Rod Lock is disengaged.
With Optional Solenoid:
Mount the optional Solenoid Valve directly to the Rod
Lock using supplied fittings. Use Teflon tape and/or pipe
sealant on the threads. If the optional Solenoid Valve isn't
mounted directly to the Rod Lock, it is recommended
to mount a Quick Exhaust Valve near the Rod Lock
for better brake response times. Refer to Figure 7.
Table 2
NOTE: Align the air inlet ports in the down position to
allow condensation to drain out of the air chamber.
2. Attach the air supply line to the air inlet, the quick
exhaust valve, or the solenoid valve, depending on
configuration selected in Step 1.
3. If using optional solenoid valve, attach DIN Connector
cable to valve by pressing DIN Connector onto valve
power pins and tightening DIN Connector fastener.
Then connect DIN Connector cable wires, using Table
2, to the appropriate power supply, see Table 3.
Optional Solenoid Valve #964650 (English Units)
Quick Exhaust Valves Air Pressure Ratings:
8 Bar [120 PSIG] Max (All Q.E. Valves)
0 Bar [0 PSIG] Min (English Q.E. Valve)
3 Bar [44 PSIG] Min (Metric Q.E. Valve)
Fittings are
configured
differently
on Metric
Solenoid
Valve.
See Sales
Drawing.
Rod Lock Unit Size Quick Exhaust Valve
Part Number
Size 150-, 200- & 250-
NFPA Inch Units 945100 (.125-27 NPT)
Size 032-, 040-, 050- & 063-
Metric ISO Units 945127 (.125-28 BSPP)
Size 325-, 400-, 500-, 600- & 800-
NFPA Inch Units 945125 (.250-18 NPT)
Size 080-, 100- & 125-
Metric ISO Units 945128 (.250-19 BSPP)
BSPP ports accept BSPP or BSPT fittings of the same size.
ISO-G and BSPP are the same thing.
*
ROD LOCK AIR CONNECTIONS (Does not apply to customer cylinder)
The Nexen Rod Lock is equipped with a NPTF or BSPP
(ISO-G) port for the air inlet. Route clean air, using soft or
hard lines, supplying at least 4.1 bar [60 psi] to facilitate
full disengagement.
NOTE: Install the valve in close proximity to the Rod
Lock unit for faster engagement and disengagement.
Higher air pressures will also speed the disengagement
time, but do not exceed 8.0 bar [120 psi] air pressure.
The Nexen Rod Lock is equipped with a port for the internal
vent (filters are included with most models). If the air quality
around the application is poor, route the vent of the Rod
Lock to a more suitable area, or use a filtered breather.
Contact Nexen for available components.
NOTE: Clean air is important for proper Rod Lock
functioning. Debris inside the Rod Lock may inhibit
performance and/or shorten the life of the product.