User Manual

1 Publicatio n 1000-UM001B-US-P - July 20 00
Chapter 4
SLS Sequence of Operation
The following is the sequence of operation for the SLS box and the SLS switch
as shown on Y-155798 Rev. M and Y-156328 Rev. B. The intentio n is to
provide an un de rstan d in g of circui t oper at io n and equ ipm ent f unc tio n. T hi s
will be an aid in troubleshooting because if the sequence stops or is
incom plete, the suspect ed part or failure may be narrowed down and
identified. Assumptions are made that the SLS has been installed properly, no
fuses are blown, power is on, all equipment is functioning correctly and all SLS
switch es are in the ON position
A. Status
1. IC is ope n .
2. Power supply LED is on.
3. Pilz PU3Z power LED on.
4. All SLS switch SAFE lights are off.
5. A l l saf ety re la y L E Ds ar e o n.
6. 1CR is energized (refer to cross bar).
7. Blown fuse pilot lights are off.
8. TB LEDs between + and – are on.
B. The remote 24V DC signal is applied to 1SR at TB#34 and TB#35
causing it to close the circuit between wires #4 and #5.
C. Since the safety relay 1SR is energized and its contacts between #13 and
#14 are closed, IC will be energized, actuating the IC auxi liary contacts
and send in g pow er to the moti on bu s.