Sequence Of Operation Settings; The Human Machine Interface (Hmi) - Generac Power Systems TTS series Owner's Manual

Operation
3.8.4 SEQUENCE 4 - STANDBY VOLTAGE AND
FREQUENCY SENSORS
• If generator AC output voltage and frequency are above the volt-
age and frequency set points, loads transfer to the GENERATOR
power source.
3.8.5 SEQUENCE 5 - VOLTAGE PICKUP
• If the Utility voltage is restored in the range between the Utility
pickup-low voltage and high voltage values with hysteresis,
Sequence 6 will begin.
3.8.6 SEQUENCE 6 - RETURN TO UTILITY TIMER
• This timer prevents re-transfer that a Utility Source voltage
surge or transient might cause.
• Adjust timer between 1 and 3 minutes. Factory setting is 1
minute.
• If UTILITY voltage remains within the range from sequence 5
for the time interval of the Return to Utility Timer setting, loads
are re-transferred back to the UTILITY source.
3.8.7 SEQUENCE 7 - ENGINE COOL DOWN TIMER
• After the switch re-transfers loads back to UTILITY, this timer
starts. When the interval has "timed out", the automatic start
circuit (Wires 178 and 183) is opened, and the engine shuts
down.
• The timer permits the engine to run at no load for a fixed time,
so the engine internal temperature can stabilize before shutting
down.
• The timer can be set anywhere between 1 and 30 minutes.
Factory setting is about 5 minutes.

3.9 SEQUENCE OF OPERATION SETTINGS

Parameter
Utility Fail – high voltage
Utility Fail – low voltage
Utility Pickup – high voltage hysteresis
Utility Pickup – low voltage hysteresis
Utility Interrupt Delay
Utility Return Delay
Generator load accept voltage
Generator load accept frequency
Time delay neutral
Engine Warm-up Time
Minimum Run Time
Engine Cooldown Time
10
Actual time between re-transfer back to UTILITY and engine
shutdown is whichever is longer of the Engine Cool Down timer
setting or any time remaining on Engine Minimum run timer.
After the switch automatically re-transfers loads back to the UTILITY
power source and the generator has shut down, the system is
"ready" for Sequence 1 again.
3.10 THE HUMAN MACHINE INTERFACE
The Human Machine Interface (HMI) is mounted on the door and is
accessible from behind the access door. The HMI is used to view
status of the ATS opertion and to change the settings of the timers
and controls. All settings can be viewed on the various screens. To
change any of the settings will require a password.
3.10.1
The Home screen comes up first when the screensaver is cleared.
It also gives an overview of the connections and status of transfer
switch and TVSS module (Figure 10).
Status
• The mimic diagram shows the position of the manual generator
• SYSTEM READY: The System Ready indicator is green when
• TVSS STATUS: The TVSS status indicator is green when the
Summary of Parameters
Range
105% <–> 125% of system voltage
75% <-> 95% of system voltage
- 5 volts (fixed)
+ 5 volts (fixed)
0 <-> 60 seconds
1 <-> 30 minutes
85% <-> 95% of system voltage
51Hz <-> 57Hz
0 <-> 10 seconds
0 <-> 180 seconds
5 <-> 30 minutes
1 <-> 30 minutes
NOTE:
(HMI)
HOME SCREEN
transfer switch and the automatic transfer switch.
the following conditions are met; 1) maintenance disconnect
switch is in the AUTO position, 2) the manual generator trans-
fer switch is closed in one position, indicating that the transfer
switch is ready for a utility outage, 3) TVSS status is good.
TVSS is undamaged and operational.
110% of system voltage
90% of system voltage
N/A
N/A
5 seconds
1 minute
90% of system voltage
55 hz
5 seconds
5 seconds
5 minutes
5 minutes
Default Value