sh030106u.pdf - 第457页

13. USIN G STO FUNCTI ON 13 - 4 13.1.6 M aintenanc e This ser vo ampl ifier has a larms and war nings for maint enance th at supp orts the D rive s afety functio n. (Refer to chapter 8.) 13.2 STO I/O signal c onne ctor (…

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13. USING STO FUNCTION
13 - 3
13.1.5 Specifications
(1) Specifications
Item Specifications
Safety observation function STO (IEC/EN 61800-5-2)
Standards (Note 2)
EN ISO 13849-1:2015 Category 3 PL e, IEC 61508 SIL 3,
EN IEC 62061 maximum SIL 3, EN 61800-5-2
Mean time to dangerous failure
(MTTFd)
MTTFd ≥ 100 [years] (314a) (Note 1)
Diagnostic converge (DC) DC = Medium, 97.6 [%] (Note 1)
Probability of dangerous failures per
hour (PFH)
PFH = 6.4 × 10
-9
[1/h]
Number of on/off times of STO 1,000,000 times
CE marking
LVD: EN 61800-5-1
EMC: EN 61800-3
MD: EN ISO 13849-1:2015, EN 61800-5-2, EN IEC 62061
Note 1. This is the value required by safety standards.
2. The safety level depends on the setting value of [Pr. PF18 STO diagnosis error detection time] and
whether STO input diagnosis by TOFB output is performed or not. For details, refer to the Function
column of [Pr. PF18] in section 5.2.6.
(2) Function block diagram (STO function)
Base power
supply for
upper arm
Base power
supply for
lower arm
Shut-off signal (STO1)
CN8
Monitor signal (TOFB1)
Shut-off signal (STO2)
Monitor signal (TOFB2)
Shut-
off
Shut-
off
Servo motor
M
Power
module
(3) Operation sequence (STO function)
STO1/STO2
ON
OFF
ON
OFF
ON
OFF
ON
OFF
0 r/min
(8 ms)
Servo motor speed
EM2 (Forced stop 2)
Magnetic contactor
Base circuit
(Supplying energy to
the servo motor)
13. USING STO FUNCTION
13 - 4
13.1.6 Maintenance
This servo amplifier has alarms and warnings for maintenance that supports the Drive safety function. (Refer
to chapter 8.)
13.2 STO I/O signal connector (CN8) and signal layouts
13.2.1 Signal layouts
POINT
The pin assignment of the connectors is as viewed from the cable connector
wiring section.
TOFB2
STO2TOFB1
STO1
STOCOM
2
CN8
STO I/O signal connector
Servo amplifier
1
43
65
87
TOFCOM
13. USING STO FUNCTION
13 - 5
13.2.2 Signal (device) explanations
(1) I/O device
Signal name
Connector
pin No.
Description
I/O
division
STOCOM CN8-3 Common terminal for input signal of STO1 and STO2 DI-1
STO1 CN8-4 Inputs STO state 1.
STO state (base shut-off): Open between STO1 and STOCOM.
STO release state (in driving): Close between STO1 and STOCOM.
Be sure to turn off STO1 after the servo motor stops by the servo-off state or with
forced stop deceleration by turning off EM2 (Forced stop 2).
DI-1
STO2 CN8-5 Inputs STO state 2.
STO state (base shut-off): Open between STO2 and STOCOM.
STO release state (in driving): Close between STO2 and STOCOM.
Be sure to turn off STO2 after the servo motor stops by the servo-off state or with
forced stop deceleration by turning off EM2 (Forced stop 2).
DI-1
TOFCOM CN8-8 Common terminal for monitor output signal in STO state DO-1
TOFB1 CN8-6 Monitor output signal in STO1 state
STO state (base shut-off): Between TOFB1 and TOFCOM is closed.
STO release state (in driving): Between TOFB1 and TOFCOM is opened.
DO-1
TOFB2 CN8-7 Monitor output signal in STO2 state
STO state (base shut-off): Between TOFB2 and TOFCOM is closed.
STO release state (in driving): Between TOFB2 and TOFCOM is opened.
DO-1
(2) Signals and STO state
The following table shows the TOFB and STO states when the power is on in normal state and STO1
and STO2 are on (closed) or off (opened).
Input signal State
STO1 STO2
Between TOFB1 and
TOFCOM
(STO1 state)
Between TOFB2 and
TOFCOM
(STO2 state)
Between TOFB1 and
TOFB2
(STO state)
STO
Off Off ON: STO state ON: STO state ON STO state
Off On ON: STO state OFF: STO release state OFF (Note) STO state
On Off OFF: STO release state ON: STO state OFF (Note) STO state
On On OFF: STO release state OFF: STO release state OFF STO release state
Note. Between TOFB1 and TOFB2 is off, but the servo amplifier is in the STO state.
(3) Test pulse of STO input signal
Set the test pulse off time inputted from outside to 1 ms or less.
13.2.3 How to pull out the STO cable
The following shows how to pull out the STO cable from the CN8 connector of the servo amplifier.
1)
2)
While pressing knob 1) of the STO cable plug in the
direction of the arrow, pull out the plug 2).