Enerpac SafeLink User Manual

Instruction Sheet

POWERFUL SOLUTIONS. GLOBAL FORCE.

L3080 Rev. D 06/14

1.0 IMPORTANT RECEIVING INSTRUCTIONS

Visually inspect all components for shipping damage. Shipping
damage is not covered by warranty. If shipping damage is found,
notify carrier at once. The carrier is responsible for all repair and
replacement costs resulting from damage in shipment.

SAFETY FIRST

2.0 SAFETY ISSUES

Read all instructions, warnings and cautions
carefully. Follow all safety precautions to

avoid personal injury or property damage
during system operation. Enerpac cannot be responsible for
damage or injury resulting from unsafe product use, lack of
maintenance or incorrect product and/or system operation.
Contact Enerpac when in doubt as to the safety precautions and
operations.

A CAUTION is used to indicate correct operating or maintenance
procedures and practices to prevent damage to, or destruction of
equipment or other property.

A WARNING indicates a potential danger that requires correct
procedures or practices to avoid personal injury.

A DANGER is only used when your action or lack of action may
cause serious injury or even death.

Failure to comply with the following hazard alert statements could
cause equipment damage and/or personal injury:

WARNING: Make no modifi cations to any SafeLink
component. Any modifi cations to the product not

expressly approved by Enerpac could void the user’s
authority to operate the product. Contact Enerpac factory for more
information.

WARNING: SafeLink products must only be serviced by a

qualifi ed electronic technician. For factory authorized

repair service, contact the ENERPAC Authorized Service
Center in your area.

WARNING: Never use any component of the SafeLink

system as a sensing device for personal protection. Doing

so could lead to serious injury or death. The SafeLink
system does NOT include the self-checking redundant circuitry
necessary to allow its use in personal safety applications. A sensor
failure or malfunction can cause either an energized or de­energized sensor output condition.

SafeLink Pallet Monitoring System

WARNING: Some SafeLink components are powered by

a 3.6 volt lithium battery. As with all batteries, there is a

fi re, explosion, and severe burn hazard risk. Do not burn
or expose the battery to high temperatures. Do not recharge,
crush, disassemble, or expose the contents to water.

WARNING: All live supply circuits must be disconnected

before wiring the machine control.

WARNING: To avoid personal injury, keep hands and feet

away from fi xture cylinder(s) and workpiece during

operation.

Note: All specifi cations published in this document are subject to
change. Enerpac reserves the right to modify the specifi cations of
products without notice. Enerpac reserves the right to update or
change documentation at any time.

1

3.0 SPECIFICATIONS

Table 1 - General Specifi cations

IP Rating Meets IEC IP67 Standards. Dust tight, immersion up to one meter.

Radio Frequency 2.4 GHz, Global Standard

Transmit Power 21 dBm conducted

Input Power for Receive Unit (SLR-1, SLR-2) + 10 VDC to + 30 VDC Supplied by machine control.

Battery for Send Unit (SLS-1, SLS-2, SLS-3) 3.6 Volt Lithium Battery, Size D (Xeno XL-205F or equivalent).

Outputs + 24 VDC, NMOS Sinking

FCC Rating FCC part 15, Subpart C, 15.247

Receive Unit Communication Protocols
(SLR-1, SLR-2)

Receive Unit Outputs (SLR-1, SLR-2) 24 VDC, Maximum of 6 per unit, NPN Sinking

Modbus RTU RS485. Modbus TCP/IP or Ethernet IP when
system is equipped with SLEB-1 Ethernet Bridge.

4.0 MOUNTING DIMENSIONS

SEND UNIT
INPUT CAPABILITIES:

SLS-1 & SLS-2: Monitors
two inputs and contains
a communications check
channel (For use only
with receive unit Model
SLR-1).

SLS-3: Monitors three
inputs (For use only
with receive unit Model
SLR-2).

D1

D2

D1

D2

D3
(4X)

D5

D4

D6

SLR-1, SLR-2 Receive Unit

D3
(4X)

D4

D5

D8

D6

D7

D1

D2

D3

(4X)

D5

D4

D6

D8

Note: Antenna not shown.

D1
D2

SLEM-1 Expansion Module

D3

(4X)

D5

D4

D6

D7

SLS-1 Send Unit SLS-2, SLS-3 Send Unit

Note: Antenna not shown.

D1
D2

D4

SLEB-1 Ethernet Bridge

D3

(4X)

D5

D6

D7

Dimensions

Item inch mm

D1

D2

D3

D4

D5

D6

D7

D8

3.18 80,8

2.56 65,0

Ø 0.22 Ø 5,5

2.56 65,0

3.16 80,1

2.23 56,6

4.20 106,7

3.67 93,2

Figure 1, Mounting Dimensions

2

5.0 MAJOR FEATURES AND COMPONENTS

SLS-1, SLS-2 and SLS-3 Send Unit SLR-1 and SLR-2 Receive Unit

H

HHH

B C, D

E

A

F

G

I

Key:

A. LED indicator, #1
B. Push Button, #1
C. Rotary Switch, “Left”
D. Rotary Switch, “Right”

E. Push Button, #2
F. LED indicator, #2
G. LCD Display
H. Antenna (SLS-2, SLS-3,

SLR-1 and SLR-2 only)

I

B

C, D

A

G

K

I. 1/2" NPT Port (equipped with plug if not used)
J. Access Holes (equipped with caps if not used)
K. Quick Disconnect Serial Port, 5-Pin M12

E

J

F

SLEM-1 Expansion Module SLEB-1 Ethernet Bridge

I I

C, D

J

K K

Figure 2, Major Features and Components

Note: The Enerpac SLCS-1 Power and Communication Splitter
Cable (sold seperately - see Figure 17) is required for use with the
SLEM-1 Expansion model or the SLEB-1 Ethernet Bridge.

Note: Housing color on current production models is black. Yellow
housing shown in this manual is for illustrative purposes only, to
help ensure that product features and details are clearly visible.

3

6.0 INSTALLATION

6.1 Overview

The SafeLink wireless pressure monitoring system continuously
monitors the clamping pressure in a fi xture during the machining
process. It is designed to be interfaced to the machine control so
the machine can be stopped immediately if clamping pressure is
lost. If desired, the SafeLink system can also be used to monitor
limit switch based position sensing on clamping cylinders.

The basic SafeLink system consists of a battery powered send
unit (SLS-1, SLS-2 or SLS-3) mounted in or on the fi xture, and
a matching receive unit (SLR-1 or SLR-2) that is connected and
interfaced to the machine control. Radio communication between
the two units is 2.4 GHz.

Pressure switches (sold separately) are installed in each fi xture
circuit to be monitored. Loss of pressure in one or more of the
switches is communicated from the send unit to the receive unit,
resulting in a fault condition being triggered. The machine control
will then initiate appropriate shut down of the machinery.

A special communication verifying feature in the receive unit
periodically queries the send unit every few seconds, to ensure
that it is responding. If there is no response, a fault condition
will be triggered, and the machine control will initiate appropriate
shut down of the machinery.

Up to 47 send units can be linked to one receive unit if

TCP/IP or Ethernet IP communication protocol is used. These

Modbus

protocols require the use of the SafeLink SLEB-1 Ethernet Bridge.

IMPORTANT: Installation and setup instructions are contained
in the following sections of this manual. These instructions are
intended only for use by experienced installation technicians with
appropriate skills and training. If custom installation services are
required, contact Enerpac for additional information.

6.2 Installing the SLR-1 or SLR-2 Receive Unit

The SLR-1 or SLR-2 receive unit should be mounted on an
external surface on the machine control enclosure, or inside of
the control enclosure on a DIN Rail using the Enerpac SLDB-1
DIN rail mounting bracket (optional accessory). See Figure 3.

6.3 Installing the SLS-1 Send Unit on a Fixture

The SLS-1 send unit must be mounted externally on the fi xture
in a location that does not expose the unit to excessive coolant
fl ow or fl ying chips.

It must be positioned so that the internal antenna can transmit
freely without interference. Use the four 5 mm mounting holes on
the base to securely mount the unit.

The SLS-1 is IEC rated at IP67, protected from dust and
immersion to 1 meter.

6.4 Installing the SLS-2 or SLS-3 Send Unit
on a Fixture

The SLS-2 and SLS-3 send units are intended to be mounted
inside of a fi xture (such as a four-sided tombstone) in a location
that does not expose the unit to excessive coolant fl ow or fl ying
chips. The SLS-2 and SLS-3 are IEC rated at IP67, protected
from dust and immersion to 1 meter. Use the four 5 mm mounting
holes on the base to securely mount the unit.

Both models contain an external antenna jack and separate
antenna. The antenna can be cabled if the fi xture has a cover.
Use the Enerpac SLS-2AC cable (optional accessory) to connect
either SLS send unit to an externally mounted antenna.

7.0 WIRING AND CONNECTIONS

7.1 Pressure Switch Installation and Wiring

All pressure switches should be located in a protected area,
where they are not exposed to excessive coolant fl ow or fl ying
chips. Wire each switch normally open, so that the circuit in the
pressure switch will close when the pressure setting is reached,
but will go open if the system pressure has decreased below
acceptable limits.

The use of an Enerpac PSCK-8 or PSCK-9 pressure switch
(optional accessory) is recommended. Connect wires to
terminals 1 and 3, so that the switch is wired normally open. See
Figure 4 for switch wiring details. Refer to Enerpac instruction
sheet L2391 for additional information regarding PSCK pressure
switch installation.

Figure 3, SLDB-1 DIN Rail Mounting Bracket (optional)

The SLR-1 and SLR-2 receive units require a connection to a 24
VDC power supply. A connection of the output from the SLR-1
or SLR-2 into the machine control is also required.

Note: The SLR receive units communicate to the machine
control via either a 24 VDC output or via Modbus RTU RS485
protocol. If Modbus TCP/IP or Ethernet IP protocols are used,
the optional SLEB-1 Ethernet Bridge is required. See sections 9
and 10 of this manual for additional information.

Both models contain an external antenna jack and separate
antenna. The antenna can be cabled if the control enclosure has
a cover. Use the Enerpac SLS-2AC cable (optional accessory)
to connect either SLR receive unit to an externally mounted
antenna.

1

3

2

PSCK-8, PSCK-9

Wiring Diagram

Function Terminal

Common 1

Normally Closed 2

Normally Open 3

Ground (not used) 4

1

3

DIN Style connector plug

(with protective cover removed)

1

3

2

2

4

Figure 4, Pressure Switch Connections (typical)

7.2 Wiring Pressure Switch to the Send Unit
(SLS-1, SLS-2 or SLS-3)

Connect the pressure switch to the SLS send unit as described
in the following procedure:

4

Ground Terminal
(GND)

Input 1 Terminal
(DI1)

Input 2 Terminal

DI2)

(

SLS-3 Only:
Input 3 Terminal
(

DI3)

Ground Terminal
(GND)

Figure 5, Send Unit Terminal Block (SLS-1, SLS-2, SLS-3)

Table 2 - SLS-1, SLS-2 and SLS-3 Wiring information

Input

Function

Input #1

Input #2

Input #3 (SLS-3 only)

SEND UNIT Input

Connection Terminal

DI1 GND

DI2 GND

DI3 GND

SEND UNIT Ground

Terminal

Remove the four screws that secure the face plate of the SLS
send unit. Locate the terminal strip inside the housing. See Figure

5.

Wire the leads from the pressure switch to the DI1 and ground
terminals per Table 2. Note that the strip contains two ground
(GND) connections. Use whichever one is most convenient. If
more than one pressure switch is used, be sure to connect them
in series.

A position sensing limit switch (if used) can be connected to
terminal DI2. Or, if desired, this terminal can instead be used to
connect one or more additional pressure switches.

IMPORTANT: Use only limit type position switches. Proximity
type switches are not compatible with the SafeLink system.

Note: For SLS-1 and SLS-2, communication input terminal
DI3 is assigned to a circuit that periodically checks for proper
operation of the sending unit during SafeLink operation. For SLS­1 and SLS-2, DO NOT make any connections to terminal DI3.

Terminals DO1, DO2, DO3, DO4 and DI4 are NOT USED.

7.3 Connecting the 24 VDC Outputs of Receive Unit
SLR-1 or SLR-2 to the Machine Control

Note: This section covers typical connections using the standard

24 VDC I/O machine interface. If using Modbus RTU, Modbus
TCP/IP or Ethernet IP, please refer to sections 9 and 10 of this
manual.

Remove the four screws that secure the face plate of the SLR-1
or SLR-2 receive unit. Locate the receive unit terminal block. See
Figure 6.

PWR
Terminal

Output
Terminals

DO1 - DO6

PWR

Terminal

Input
Terminals
(not used)

Figure 6, Receive Unit Terminal Block (SLR-1, SLR-2)

Wire the output terminals of the SLR-1 or SLR-2 to the machine
control input terminals. Refer to Table 3 for SLR terminal block
connection information.

Note: Two + 24 VDC power terminals (PWR) are available at the
top of the terminal block. The DO-x outputs of the SLR receive
unit are pre-paired to the DI-x inputs of the SLS send unit.

Table 3 - SLR-1 and SLR-2 Wiring information

Send Unit ID and Input

(SLS-1, SLS-2, SLS-3)

ID # Input #

01

01

01 DI3* DO3* *

02

02

02

DI1 DO1 PWR

DI2 DO2 PWR

DI1 DO4 PWR

DI2 DO5 PWR

DI3

* DO6* *

8.0 SETUP

Receive Unit Terminals

(SLR-1, SLR-2)

See Figure 6

Output

(-24 VDC)

Power

(+24 VDC)

PWR

PWR

* SLS-3 only. * * SLR-2 only.

8.1 Selecting the Send Unit ID

Open clear round cover on SLS-1, SLS-2 or SLS-3.

Using the rotary switches, set the send unit ID. Start with “01” for
the fi rst send unit in your network. The second send unit would
be “02”. See Figure 7.

Note: The maximum number of send units that can be paired
with a receive unit will vary, depending on the communication
protocol being used. Refer to Section 9 of this manual for
additional information.

Set ID for each
SEND UNIT using
rotary switches.

5

Figure 7, Setting ID Number of SLS Send Unit