specified functions. Control, logic, and function devices shall be
compatible as a system, sealed, dust and water tight, and shall utilize
modular components with metal housings and digital instrumentation. An
interface module shall be provided to decode serial link data from the
electronic panel and translate alarm, fault and status conditions to set of
relay contacts. Instrument accuracy shall be not less than 98% for unit
mounted devices and 99% for control room, panel mounted devices, throughout
a temperature range of minus 20 to plus 65 degrees C minus 4 to 158 degrees
F. Data display shall utilize LED or back lit LCD. Additionally, the
display shall provide indication of cycle programming and diagnostic codes
for troubleshooting. Numeral height shall be [13 mm 0.5 inch] [_____].
2.20.4
Parameter Display
Indication or readouts of the tachometer, lubricating-oil pressure, ac
voltmeter, ac ammeter, frequency meter, and safety system parameters shall
be provided. A momentary switch shall be specified for other panels.
2.21
AUTOMATIC ENGINE-GENERATOR-SET SYSTEM OPERATION
**************************************************************************
NOTE: Automatic operation is for standby. For
hospital emergency/standby requirements, refer to TM
5-838-2. Delete automatic paralleling and loading
where not required. Adapt to fit application and
provide desired actuation sequence.
**************************************************************************
Fully automatic operation shall be provided for the following operations:
engine-generator set starting and load transfer upon loss of [normal]
[preferred] source; retransfer upon restoration of the [normal] [preferred]
source; sequential starting; paralleling, and load-sharing for multiple
engine-generator sets; and stopping of each engine-generator set after
cool-down. Devices shall automatically reset after termination of their
function.
2.21.1
Automatic Transfer Switch
Automatic transfer switches shall be in accordance with Section 16410A
AUTOMATIC TRANSFER SWITCH AND BY-PASS/INSOLATION SWITCH.
2.21.2
Monitoring and Transfer
Devices shall be provided to monitor voltage and frequency for the [normal]
[preferred] power source and each engine-generator set, and control
transfer from the [normal] [preferred] source and retransfer upon
restoration of the [normal] [preferred] source. Functions, actuation, and
time delays shall be as described in Section 16410A AUTOMATIC TRANSFER
SWITCH AND BY-PASS/ISOLATION SWITCH.
2.21.3
Automatic Paralleling and Loading of Engine-Generator Sets
An automatic loading system shall be provided to load and unload
engine-generator sets in the sequence indicated. The loading system shall
monitor the system load and cause additional engine-generator sets to
start, synchronize, and be connected in parallel with the system bus with
increasing load. Actuation of the additional engine-generator set start
logic shall occur when the load exceeds a percentage setpoint of the
operating set's rating for a period of approximately 10 seconds. The
SECTION 16263A
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