TP-6461 1/08
44
Section 3 Transfer Switch Troubleshooting
3.6.2
Solenoid Operation
This section contains descriptions and diagrams of the
solenoid coil operation. For complete diagrams, refer to
the schematic diagrams provided with the transfer
switch.
The ATS controller monitors the connected source and
detects source failure, either a complete loss of the
source or a source parameter that is outside the
acceptable range. The controller starts the engine start
time delay. If power is restored before the time delay
ends, the controller resets the time delay and continues
to monitor the source. If the source failure persists and
the time delay ends, the controller closes the engine
start contacts to signal the Source E generator set to
start.
When Source E (or the standby source) becomes
available, the controller starts the preferred-to-standby
time delay (if not set to zero). When the time delay ends,
relay K2 (ER) in the controller closes, applying power to
the solenoid coil and initiating transfer.
When Source N (or the preferred source) is restored, the
controller starts the standby-to-preferred time delay.
When the time delay ends, the controller’s K1 (NR) relay
closes, applying power to the solenoid coil and initiating
transfer back to Source N (or the preferred source).
Note:
The K1 (NR) and K2 (ER) relays are energized for
only 250 milliseconds to initiate transfer.
On 40--225 amp model KSS standard-transition
switches, control contacts SCN and SCE control the
amount of time that power is applied to the solenoid coil.
The contacts open before the operating mechanism
reaches Top Dead Center (TDC). Inertia carries the
mechanism through TDC, and a spring in the solenoid
assembly moves the mechanism into the Source E (or
standby) position.
Model KSP programmed-transition models stop in the
OFF position for a programmed length of time during
transfer. The transfer-to-OFF sequence is controlled by
the NR1 and ER1 relays on the programmed-transition
interface board (PTIB).
The controller K1 and K2 relays and the PTIB relays are
replaceable.
Note:
Always check all wiring and connections before
replacing parts.
The solenoid power circuits vary for different ATS
models. The following sections describe and illustrate
the transfer sequence for the different models.
Figure 3-3 explains the notation used in the solenoid
operation diagrams in the following coil operation
diagrams.
ATS1:
Trip switch, Normal *
AX:
Coil clearing switch, Normal *
BTS1:
Trip switch, Emergency *
BX:
Coil clearing switch, Emergency *
CC:
Closing coil *
EA, EC:
Emergency source
LS:
Line select switch *
NA, NC:
Normal source
NR, ER:
Controller relays. Energized for
250 milliseconds to initiate transfer.
NR1, ER1:
Programmed-transition interface
board relays. *
SCN, SCE:
Coil control contacts (microswitches)
SC:
Select coil *
S1:
Bridge rectifier *
TC:
Trip coil *
Power through the coil circuit.
=
=
* Used on programmed-transition switch diagrams
open
contacts
closed
contacts
Figure 3-3
Legend for Solenoid Operation Diagrams
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