Low-speed Monitoring Unit
G9SX-LM
Low-speed Monitoring Function Ensures
Safety for Maintenance Work
• Motor rotation speed detected by Proximity Sensor.
• Monitors and confirms that speed does not exceed the preset level.
• Includes an Enabling Switch input for maintenance work.
• Detailed LED indications enable easy fault diagnosis.
• PLd/Safety Category 3 (ISO 13849-1),
SIL 3 (IEC/EN 62061) certified.
Be sure to read the "Precautions" on
page 22
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Model Number Structure
Model Number Legend
G9SX-
@@@@@
-@@@-@@
–– – – –
1
2 3 4
–––
5
––
6
1. Functions
LM: Low Speed Monitoring Unit
EX: Expansion Unit
2. Output Configuration (Safety instantaneous output)
2: 2 outputs
4: 4 outputs
3. Output Configuration (Safety Speed detection output)
2: 2 outputs
4. Output Configuration (Auxiliary output)
1: 1 output
4: 4 outputs
5. Maximum preset value
Low-Speed Monitoring Unit
F10: 10Hz
Expansion Unit
No indicator: No OFF delay
6. Terminal block type
RT: Screw terminals
RC: Spring-cage terminals
List of Models
Low-speed Monitoring Unit
Safety
instantaneous
output
2
(Semiconductor)
Safety slow-speed/
Maximum set
Auxiliary output
stopping detection output
threshold
2 (Semiconductor)
4
(Semiconductor)
10 Hz
Rated
voltage
24 VDC
Terminal block type
Screw terminals
Spring-cage terminals
Model
G9SX-LM224-F10-RT
G9SX-LM224-F10-RC
Expansion Unit
Safety outputs
Instantaneous
4a (contact)
OFF-delayed
0
Auxiliary
outputs
1
(Semiconductor)
OFF-delay
time
--
Rated
voltage
24 VDC
Terminal block type
Screw terminals
Spring-cage terminals
Model
G9SX-EX401-RT
G9SX-EX401-RC
1
G9SX-LM
Specifications
Ratings
Power input
Item
Rated supply voltage
Operating voltage range
Model
24 VDC
-15% to +10% of rated supply voltage
2 W max.
G9SX-LM224-@
G9SX-EX401-@
Power consumption
*
5 W max.
*
Power consumption of loads not included.
Inputs
Item
Safety input
Enabling input
Feedback/reset input
Mode selector input
Model
Operating voltage: 20.4 VDC to 26.4 VDC
Internal impedance: Approx. 2.8 kΩ
*
G9SX-LM224-@
Operating voltage: 20.4 VDC to 26.4 VDC
Rotation detection input
Internal impedance: Approx. 2.8 kΩ
*
Frequency input range: 1 kHz max.
*
Provide a current equal to or higher than that of the minimum applicable load of the connected input control device.
Outputs
Item
Model
Source output (PNP compatible)
Load current: 0.8 A DC max.
*2
Source output (PNP compatible)
Load current: 0.3 A DC max.
G9SX-LM224-@
Safety instantaneous output
*1
Safety speed detection output
*1
Auxiliary output
Source output (PNP compatible)
Load current: 100 mA DC max.
*1.
While safety instantaneous outputs and safety speed detection outputs are in the ON state, the following pulse signal is output continuously
for output circuit diagnosis.
When using these safety outputs as input signals to control devices (i.e. Programmable Controllers), consider the pulse signal shown below.
Approx. 100 ms
ON
OFF
360 µs max.
*2.
The following derating is required when Units are mounted side-by-side.
G9SX-LM@: 0.4 A DC max. load current
Expansion Unit
Item
Rated load
Rated carry current
Maximum switching voltage
Model
250 VAC, 3A /30 VDC, 3A (resistive load)
3A
250 VAC, 125 VDC
G9SX-EX-@
2
G9SX-LM
Characteristics
Item
Over-voltage category
(IEC/EN60664-1)
Model
II
50 ms max. (Safety input: ON,
Enabling input: ON)
100 ms max. (Logical AND
connection input: ON)
15 ms max.
450 ms max.
50 ms max.
G9SX-LM224
G9SX-EX401
II
(Safety relay outputs 13 to 43 and 14 to
44: III)
30 ms max.
*6
10 ms max.
*6
--
--
Operating time (OFF to ON state)
*1 *2 *5
Response time (ON to OFF state)
*1 *5
Allowable time for switching Mode selector inputs
*3
Mode selector input response time
*4
ON-state residual voltage
OFF-state leakage current
Maximum cable length for logical connection inputs and Safety inputs
Reset input time
Accuracy tolerance of low speed detection frequency
Insulation
resistance
Between logical AND connection terminals, and power
supply input terminals and other input and output
terminals connected together
Between all terminals connected together and DIN rail
Between logical AND connection terminals, and power
supply input terminals and other input and output
terminals connected together
Dielectric
strength
Between all terminals connected together and DIN rail
Between different poles of outputs
Between safety relay outputs connected together and
other terminals connected together
Vibration resistance
Mechanical
shock
resistance
Destruction
Malfunction
Electrical
Durability
Mechanical
Ambient temperature
Ambient humidity
Terminal tightening torque
*7
Weight
3.0 V max. (safety instantaneous outputs, safety speed detection outputs,
and auxiliary outputs)
0.1 mA max. (safety instantaneous outputs, safety speed detection
outputs, and auxiliary outputs)
100 m max. (External connection impedance: 100
Ω
max. and 10 nF max.)
100 ms min.
Within minus 10% of the set value
--
--
100 MΩ min., 500 VDC megger
--
1,200 VAC for 1 min
1,200 VAC for 1 min
--
2,200 VAC for 1 min
20 MΩ min., 250 VDC megger
500 VAC for 1 min
Frequency: 10 to 55 to 10 Hz, 0.375-mm single amplitude (0.75-mm double amplitude)
300 m/s
2
100 m/s
2
--
100,000 cycles min.
(rated load, switching
frequency: 1,800 cycles/hour)
5,000,000 cycles min.
(switching frequency: 7,200
cycles/hour)
--
-10 to 55°C (no icing or condensation)
25% to 85%
0.6 N·m
Approx. 240 g
Approx. 165 g
*1.
When two or more Units are connected by logical AND, the operating time and response time are the sum total of the operating times and
response times, respectively, of all the Units connected by logical AND.
*2.
*3.
*4.
*5.
Represents the time required to turn ON safety instantaneous outputs when required conditions are met.
Represents the time allowed for switching mode selector inputs. If it exceeds 450 ms, G9SX-LM@ will detect it as a failure.
Represents the time required for safety inputs/enabling inputs to be switched following a switch of mode selector inputs.
Operating time and response time do not include the frequency detection time and the time affected by the characteristics of proximity sensors.
For response performance of the entire system, see "(5)
Response performance regarding speed detection".
450 ms max.
M1
M2
50 ms max.
MOD
Safety input is
valid
state
Enabling input is
valid
state
*6.
The value of the operating time and response time of the connected Low-speed Monitoring Unit is not included.
*7.
For the G9SX-@-RT (with screw terminals)
Logical AND Connection
Item
Number of Units connected per logical AND output
Total number of Units connected by logical AND
*
Number of Units connected in series by logical AND
Max. number of Expansion Units connected
Maximum cable length for logical AND input
*
The number of G9SX-EX401-@ Expansion Units not included.
100 m max.
Model
G9SX-LM224
4 units max.
20 units max.
5 units max.
--
5 units max.
--
G9SX-EX401-@
--
--
--
3
G9SX-LM
Connections
Internal Connection
G9SX-LM224-@ (Low-speed Monitoring Unit)
A1
T11 T12 T21 T22 Y1
M1 M2
T61 T62 T71 T72 Y2
D12 D22
T31 T32 T33
T41 T42
*2
Power
supply
circuit
Enabling Enabling
Input ch1 Input ch2
Cross fault
detection
enabling
input A
Mode selector
input
Safety
Safety
Input ch1 Input ch2
Cross fault
detection
enabling
input B
Rotation
detection input
Reset/Feedback
Input
Logical AND
input
*1
Safety output control
Auxiliary output control
Sensor Power supply
control
Expansion Unit
output control
A2
S14 S24 ES1 ES2
*
3
L1
X1
X2 X3
X4
D11 D21
*1.
Internal power supply circuit is not isolated.
*2.
Logical AND input is isolated.
*3.
Outputs S14 , S24, ES1, ES2, and L1 are internally redundant.
G9SX-EX401-@ (Expansion Unit)
A1
*1
Power
supply
circuit
Safety
output
control
Auxiliary
output
control
13 23 33 43
*2
Additional
signal
input
K2
14 24 34 44
A2
X2
*1.
Internal power supply circuit is not isolated.
*2.
Relay outputs are isolated.
4
Additional
signal
output
K1
G9SX-LM
Wiring of Inputs and Outputs
Signal Name
Power supply
input
Terminal
Name
A1, A2
Description of operation
The input terminals for power supply.
Connect the power source to the A1 and A2 terminals.
Wiring
Connect the power supply plus (24 VDC) to the A1 terminal.
Connect the power supply minus (GND) to the A2 terminal.
Enabling
Switch
+24V
+24V
Enabling input
ch1
T11, T12
To set Safety instantaneous outputs in the ON state in the
Maintenance mode, HIGH state signals must be input to
both of enabling input CH1 and enabling input CH2.
Otherwise Safety instantaneous outputs cannot be in the
ON state.
Using 1 safety
input channel
T11 T12 T21 T22
+24V
+24V
Y1
Enabling input
ch2
Using 2 safety
input channels
(cross fault
detection OFF)
Using 2 safety
input channels
(cross fault
detection ON)
Enabling
Switch
+24V
T11 T12 T21 T22
Enabling
Switch
Y1
T21, T22
NC
T11 T12 T21 T22
+24V
Y1
Safety input
ch1
T61, T62
Using 1 safety
input channel
T61 T62 T71 T72
+24V
Y2
Safety input
ch2
T71, T72
To set Safety instantaneous outputs in ON state in the
Normal operating mode, HIGH state signals must be input
to both of Safety input CH1 and Safety input CH2
Otherwise Safety instantaneous outputs cannot be in ON
state.
+24V
+24V
Using 2 safety
input channels
(cross fault
detection OFF)
Using 2 safety
input channels
(cross fault
detection ON)
+24V
T61 T62 T71 T72
Y2
NC
T61 T62 T71 T72
Y2
Feedback loop
Reset/Feedback T31, T32,
Input
T33
To set Safety instantaneous outputs in the ON state, the
ON state signal must be input to T33. Otherwise Safety Auto reset
instantaneous outputs cannot be in the ON state.
To set Safety instantaneous outputs in the ON state, the signal
input to T32 must change from the OFF state to the ON state,
Manual reset
and then to the OFF state. Otherwise Safety instantaneous
outputs cannot be in the ON state.
Unit A
+24V
KM
T31
T32
T33
Feedback loop
KM
T31
input 1
T32
+24V
T33
Logical AND
connection
input
T41, T42
The logical AND connection means that lower unit (Unit B)
calculates the logical multiplication (AND) of the safety
output information from upper unit(Unit A) and safety input
signal "b", which is input to lower unit. In the example of a
right picture, the safety output of Unit C is "a" AND "b" .
Connect L1 or L2 of upper unit to T41 of lower unit, and
connect GND of upper unit to T42 of lower unit. To set
Safety instantaneous outputs of the subsequent Unit in ON
state, its Logical AND Connection Preset Switch must be
set to AND (enabled) and High state signal must be input
to T41 of the subsequent unit.
G9SX-LM
output
L1
A2
Next unit
(4
unit
Max.)
Logical AND connection sig. (1st layer)
input 2
Unit B
T41
L1
T42
A2
Logical AND connection sig. (2nd layer)
T41
L1
T42
A2
Next unit
(4
unit
Max.)
T41
T42
G9SX-LM
output
G9SX-LM
G9SX-LM
Next unit
(5 layers Max.)
5
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