Delta EB3000 Series User Manual page 81

Chapter 4 WiringEB3000
4-9-4-2 STO Monitor Output Function and Built-in Keyboard Panel KPED-LE02
The table below describes the drive output and STO monitor status depending on STO inputs:
STO Inputs
Input 1, Input 2,
STO1- STO2-
E24V E24V
OFF OFF
ON OFF
OFF ON
ON ON
STO Status Monitor
With the STO monitor output (terminals SMO+ and SMO-), the drive provides a safety status
feedback signal. The safety status feedback signal should be read by the device that controls STO
inputs (PLC or a safety relay) in order to prevent the STO Active from exiting in case the safety
circuit malfunctions.
Display on Built-in Keyboard Panel (KPED-LE02)
Compared with terminals SMO+ / SMO-, the STO monitoring function of digital output (MO)

setting #42 is a software function. It can be used as a single contactor solution that complies
with EN81-1, but cannot be used as a SMO signal that complies with IEC/EN 61800-5-2.
When both STO inputs are OFF, the UD indicator on the built-in keyboard panel will light on.

If one STO channel is OFF while the other is ON, fault code StL1 or StL2 displays on KPED-

LE02. If STO circuits are used properly, in normal condition, these fault codes will not display.
If both STO channels are not OFF after RUN command has been OFF for more than four

seconds, fault code StL4 (STO sticking warning/fault can be set through Pr.04-10) displays on
KPED-LE02, indicating there is a problem in the safety circuit or in the drive.
If faults in the safety circuit are detected, fault code StL3 to StL5 display on KPED-LE02,

indicating there is damage to the drive.
For details on these fault codes, see Chapter 9 Warning and Fault Codes.

STO Monitor
STO Monitor
SMO Pr.01-14
(SMO+, SMO-)
= 42
ON ON
OFF OFF
OFF OFF
OFF OFF
4-28
Drive
Pr.01-14
Output
= 142
OFF Disabled
ON Disabled
ON Disabled
Ready to
ON
output
Built-in Keyboard
Panel Display
(KPED-LE02)
No display
StL2
StL1
No display
Table 4-16