Standard Features:
- 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
features.
- 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
transfer.
- 60 Hz or 50 Hz
selector switch.
-
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.
Time Delays
-
Adjustable time delay to override momentary
normal source outages to delay all transfer switch and engine-starting
signals.
-
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
30 minutes.
-
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
loading.
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.
|