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Instruction Leaflet
30-470 (E)
Page 9
Solid State Type
Ratings 1.2 watts power consumption
Input Coil Voltage 120 volts at 50/60 Hertz
Contact Rating 10 amperes resistive at 120 volts
Time Range 2 to 3 seconds nonadjustable
Operating Temperature Range -10°C to +55°C
Description
This is an octal plug-in relay containing solid-state control, a Dc coil
and a one pole single throw set of contacts complete in a dust-tight
yellow capsule. The relay will pick up instantaneously when voltage is
applied to the coil and remains in this position as long as the coil is
energized. Timing begins immediately upon de-energization and at the
end of the timing cycle, the contacts will return to their original
position. If the power should return prior to the completion of the timing
cycle, the relay will reset for another complete timing cycle.
Application
When used on the Robonic Automatic Transfer Switch as an engine
starting relay, this relay has been designated as a device E.S. The
relay is incorporated in the control scheme to delay the start-up of the
engine-generator set until normal supply voltage has been interrupted
for a longer time than the timing period. If normal supply voltage has
not returned by the end of the delay period, the relay contacts cause
the engine-generator set to start and when the emergency supply
voltage and frequency has reached the pickup value of the control
relay, the relay will energize and initiate the operation of the transfer
switch to the emergency position.
Control Relay
(
CR
)
Ratings 1.2 volt amperes power consumption
Input Coil Voltage 120 volts 60 hertz and 50 hertz
Contact Rating 10 amperes resistive
Operating Temperatures -10°C to +55°C
Settings 50 hertz fixed sensing or 60 hertz fixed sensing
Description
This device CR is an octal plug-in unit complete with solid-state
sensing, single pole, double throw set of contacts, two sets of single
pole single throw contacts and a Dc coil enclosed in a dust-tight
yellow capsule. The receptacles and plugs are designed to ensure a
tight fit to reduce the possibility of coming loose through vibrations.
The solid-state sensing of both the 50 and 60 hertz relays is set for
pickup values as indicated on the above chart.
Application
The control relay, CR, is incorporated into the control scheme to
prevent the transfer of the load to the standby power source until the
source has reached an acceptable level of voltage and frequency. In
doing so, there will be little chance of damage due to low voltages or
low frequencies. If the standby power source can only produce
voltage an insufficient frequency or frequency and insufficient voltage
the Robonic Automatic Transfer Switch will not transfer to the
standby power.
When the standby power source is supplying sufficient voltage and
frequency, this relay will operate its contacts and initiate transfer.
Upon restoration of the normal supply, device EN will open its contact
in the control relay circuit causing the relay to de-energize initiating
operation of the transfer switch to the normal position.
Chart A
CONTROL RELAY CHARACTERISTICS
pickup only
Tolerance Levels
Percent Voltage
Percent Frequency