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ASCO Control Panel Standard Features & Design Criteria -
- Motor load transfer
controls (in-phase monitor) to keep motors operating during transfer.
- Pre-transfer &
post-transfer load disconnect contacts for signaling motor starters, elevators,
VFDs and other selected loads.
- Standard Engine Exerciser
for weekly automatic testing of engine generator set with or without load.
- Selectable control
switches for voltage, frequency, time delay settings & additional control
- Switch position lights,
source availability lights, test switch and time delay bypass switch.\
Standard Selectable Features
In-phase monitor to transfer motor loads, without any intentional off time
to prevent motor inrush currents from exceeding normal starting levels.
Engine exerciser to automatically test backup generator each week. Includes
control switch for testing with or without load.
Selective load disconnect, double-throw contact to operate at an adjustable
0 to 20 second time delay prior to transfer and reset 0 to 20 seconds after
- 60 Hz or 50 Hz
Three-phase/single-phase selector switch.
Voltage & Frequency Sensing
Adjustable three-phase, close differential
voltage sensing on normal source.
Normal source pickup voltage is adjustable to
95% of nominal; drop-out is adjustable from 70 to 90% of nominal.
Frequency sensing on emergency source. Pickup at
95% and dropout at 85% of nominal.
Adjustable time delay to override momentary
normal source outages to delay all transfer switch and engine-starting
Transfer to emergency time delay. Adjustable
from 0 to 5 minutes for controlled timing of load transfer to emergency.
Retransfer to normal time delay. Adjustable to
Five-minute unloaded running
time delay for emergency engine generator cool down.
Four-second time delay to override momentary to
ignore momentary voltage and frequency transients during initial genset
Standard Control Contacts
- Switch position indicating contacts (rated
10 amps 250VAC, 32VDC). (1) for Normal position, (1) for Emergency position.
- Gold plated engine start contacts (rated 5
amps 28VDC or 120VAC)
Remote Control Features
Terminal provisions for connecting:
Remote contact for test or for peak
shaving applications. Circuit will be automatically bypassed if
emergency source fails.
Inhibit transfer to emergency.
Remote time-delay bypass switch.
Electrostatic discharge (ESD) immunity.
- ENV50140:1993 Radiated
electromagnetic field immunity.
Electrical fast transient (EFT) immunity.
- EN61000-4-5:1995 Surge
- ENV50141:1993 Conducted
radio-frequency field immunity.
- EN55011:1991 Group 1,
Class B conducted and radiated emission.
- ANSI C37.90/IEEE472
Voltage Surge Test.
- NEMA ICS-109.21 Impulse
- Digital circuitry isolated
from line voltages.
- Optically isolated RS485
Serial Communications Interface (Acc. 72A).
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