Programming instructions

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IL 30-471 (E)
Consider the Robonic in the normal
operating position, with normal
power available and the normal in-
terrupter closed. The following are
energized: U.V. (undervoltage mod-
ule), TDES (time delay engine start),
and NR (normal relay).
The U.V., monitoring all 3 phases of
the normal power, senses a dip or
loss of voltage which instantly
causes NR to deenergize. Contacts
NR2 and NR4 open, and contacts
NRl and NR3 close. TDES times
out, closing its contact and initiating
the emergency system start up.
When the emergency system
TYPICAL SCHEMATIC AND SEQUENCE OF OPERATION
EL, NL PILOT LIGHTS (OPTIONAL)
NAS, EAS LOCKOUT SWITCHES (OPTIONAL)
ELS, NLS LIMIT SWITCHES
TM TRANSFER MOTOR
BS BRAKE SOLENOID
TDES TIME DELAY ENGINE START COIL/CONTACT (OPTIONAL)
NR5 INSTANTANEOUS ENGINE START CONTACT
ET3, ET4 OPTIONAL TRANSFORMERS
TDEC TIME DELAY ENGINE COOL DOWN (OPTIONAL)
TSS TEST SELECTOR SWITCH
reaches correct levels of voltage and
frequency, ER is energized and con-
tact ER2 closes. This completes the
emergency control circuit, and TM
(transfer motor) begins to operate.
First, The normal interrupter is
opened, and then the emergency
interrupter is closed. At this point,
the ELS (emergency limit switch)
contacts change state, and the BS
(motor brake) closes, preventing TM
over travel. The NLS (normal limit
switch) contacts change state in
preparation for re-transfer to the
normal power source.
Upon return of stabilized normal
power, NR is re-energized disabling
the emergency control circuit, and
enabling normal control circuit. The
TM operates, opening the emer-
gency interrupter and closing the
normal interrupter. When the re-
transfer is completed, the NLS con-
tacts change state isolating TM, and
BS closes. TDES becomes ener-
gized opening its contacts. TDEC
times out to allow the emergency
generator to run unloaded and cool
off before shutting down. The
Robonic is now ready to react to
another normal power failure.
SWITCH DE-ENERGIZED
NORMAL INTERRUPTER CLOSED