Omron DEVICENET SAFETY - 03-2008 Operation Manual page 91

DST1-MRD08SL-1
For the DST1-MRD08SL-1, isolating transformers, such as TR1, that are used to
isolate between overvoltage categories III and II must conform to IEC60742,
and the insulation between the primary input and secondary output must sat-
isfy at least the basic insulation standards of overvoltage category III.
One side of the secondary output of the isolating transformer must be
grounded to prevent electrical shock in case of short-circuiting to the ground
or to the frame of the isolating transformer.
To protect the isolating transformer and to prevent electrical shock in case of
short-circuiting to the frame, insert fuses according to transformer specifica-
tions, i.e. at points F1, F2, and F3.
For Model DST1-MRD08SL-1, Insert a fuse rated at 3.15 A or less for each out-
put terminal to protect safety output contacts from welding.
Confirm the fuse selection with the fuse manufacturer to ensure the depend-
ability of the characteristics of the connected load.
IMPORTANT
70
!WARNING
• Supply power to both V0 and V1. The states of the relay contacts are
internally monitored from the power supply of V 0.
• Power supply terminal V1 for the outputs is internally monitored. Supply
the voltage in the specified range (20.4 to 26.4 VDC). If the voltage is sup-
plied outside this range, voltage will not be supplied to the output circuits.
Section 5-3