Specifications

Simplex, Inc., 5300 Rising Moon Road, Springfi eld, IL 62711-6228 • 217-483-1600 • Fax [phone]
Merlin-150-300c.indd • © 2011 Simplex, Inc. All Rights Reserved. • Printed in the USA. • www.simplexdirect.com
LOAD BANK MANUAL • Merlin 150-300 Load Bank • page 6 of 15
SHUTDOWN
1. De-energize the load.
2. Run the cooling fan for 5
minutes to assure a thor-
ough cool down of all load
elements (optional).
3. Place the “Control Power”
circuit breaker (FCB) in the
“Off” position.
COOLING FAILURE
SUBSYSTEM
Excessive intake or exhaust
temperatures or any reduc-
tion in cooling air fl ow for any
reason is indicated by the
illumination of the “Cooling
Failure” lamp. All load steps
are locked out until the prob-
lem is corrected and failure
related relays are reset. The
Cooling Failure Subsystem consists of
the Alarm Reset pushbutton (PB1), Fan
Pressure Switch (PS), the Intake Tem-
perature Switch (INTS), the Exhaust
Temperature Switch (EXTS), and the
Cooling Failure Relay (CFR). The CFR
must be energized to enable load ap-
plication. When the cooling fan creates
suffi cient airfl ow the PS closes. The
operator presses the PB1 to complete
the circuit to the CFR. CFR energizes,
closing contacts 8–5, opening contacts
7–1, and closing contacts 7–4. Closed
CFR contacts 8–5 lock in the circuit
to the CFR, open CFR contacts 7–1
extinguishes the Cooling Failure lamp
(L2), and closed CFR contacts 7–4
complete the circuit to the Master Load
switch (S2).
An exhaust temperature above 295°
F, intake temperature above 125° F,
or a substantial reduction in air fl ow
pressure will result in the Load Bank
entering a failure state. The “Cooling
Failure” lamp is illuminates and the
load is de-energized. Until the failure
is investigated and the control system
is reset the load cannot be reapplied.
If a failure occurs during Load
Bank operation, the Load Bank
will de-energize all load steps.
The operator must reset the
Load Bank by turning it “Off”
then “On”. The load failure
must be investigated and cor-
rected before load application
can resume.
Part of Typical Control Section Drawing