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Page 24
SECTION 7: ADJUSTMENTS
7.1 GENERAL
Certain devices, such as the sensing relays and timers,
need to be set and/or calibrated prior to placing the
transfer switch equipment into service. The devices fur-
nished with the equipment will be the same or similar to
those described in this section. Adjustments should be
made as instructed for the devices supplied. Refer to
Instruction Book I.G. ATS-AT201.
7.2 PLANT EXERCISER TIMER
The plant exerciser is a 7-day timer used to exercise the
engine driven generator.
7.2.1 TIMER PROGRAMMING
The timer incorporates a 7-day time base, permitting
each day of the week to be uniquely programmed. The
timer displays in 24 hour format.
7.3 MICROPROCESSOR-BASED LOGIC
There are four main groups of functions included in the
AGswitch controller.
7.3.1 VOLTAGE SENSING FUNCTIONS
Volt sensing functions are factory programmed
• 1-phase or 3-phase sensing
• Undervoltage sensing
The pickup and dropout points for normal undervoltage
and emergency undervoltage can be programmed using
the controller.
Undervoltage Sensing Function
• Available pickup settings (% of normal): 100, 95, 90,
and 85
• Available dropout settings (% from pickup setting): 5,
10, 15, and 20.
7.3.2 FREQUENCY SENSING FUNCTIONS
The controller is factory programmed to sense
underfrequency of the emergency power source
only.
The normal frequency of the power sources and the
pickup points can be programmed using the controller.
The normal frequency settings are 50 or 60 Hz.
Available dropout settings for the under frequency
function are:
• at 60 Hz nominal = 90-97% of the nominal system frequency
• at 50 Hz nominal = 90-97% of the nominal system frequency
Under frequency pickup settings are the dropout settings
+1 Hz to 99% of the nominal system frequency.
7.3.3 TIME DELAY FUNCTIONS
The controller is factory programmed to include different
time delay functions. Each function has different timing
ranges that can be adjusted by using the membrane
switches on the controller.
TDNE, TDEN, and TDEC
• Programmable
• 0 to 1800 seconds
• TDES
• 0 ot 120 seconds
TDEF
• 0-6 seconds
Both the pickup and dropout values of the sensing func-
tion and the timing ranges of the time delay functions
may be easily changed by following the instructions pro-
vided in the later sections.
Controllers shipped from the factory are programmed to
the standard pickup and dropout values as follows:
Function
Undervoltage
Underfrequency (60 Hz)
Underfrequency (50 Hz)
7.3.4 ON-BOARD INDICATORS
Four LED indicators are installed on the controller's
membrane for the following functions:
Normal
LED ON indicates the voltage and
Available
frequency levels of the Normal Source
are within the programmed values.
Normal
LED ON indicates that the load is
Connected
connected to the Normal Source.
Emergency
LED ON indicates the voltage and
Available
frequency levels of the Emergency
Source are within the programmed
values.
Emergency
LED ON indicates that the load is
Connected
connected to the Emergency Source.
I.B. ATS-AG03
Pickup
Dropout
90%
80%
58 Hz
56 Hz
48 Hz
46 Hz
Effective 7/00
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