Red Lion RLY5 - Manual (Page 2)

FUSING
The output of the SSR Power Unit should be protected by a fast blow I 2 t fuse
(Bussman KAX-30 or equivalent). This guards against long duration surge
currents, short circuits, etc., which may damage the SSR Power Unit.
MECHANICAL INTERRUPT SWITCH
The off-state output leakage current of the power unit is 10 mA maximum.
The voltage level of the output will rise proportional to the resistance of the load
due to this leakage current. Full line voltage can be measured when the output
is connected to a high resistance load and the power unit is in the off-state.
A mechanical interrupt switch (double pole) should be placed between both
sides of the line voltage and the load. The switch should be opened when
servicing any part of the output wiring. When measuring the off-state output
voltage of the unit for correct operation, load the output of the SSR Power Unit
with a small resistance (approximately 100 ohms).
SNUBBING
The power unit has internal snubbers to guard against transients generated by
most loads. Loads with low power factors (ie. motors) may require additional
external snubbing network.
SURGE CURRENT
When the SSR Power Unit switches a load on, an in-rush (surge) current that
is higher than the continuous load current will flow. The surge current can be
estimated from the table below which outlines the ratio of surge to steady state
current for various load devices. The surge current duration must be within the
Safe Operating Area of the Peak Surge Current vs. Time Figure. Surge currents
outside the safe operating area will shorten the life of or cause permanent
damage to the power unit.
240VAC
2
1
UNIT
POWER
SSR
3
4
+
-
OP1-C
OP1-B
OP1-A
1
2
3
4
5
6
LOAD
FUSE
DOUBLE POLE
SWITCH
AC POWER
(115/230VAC
SWITCH SELECTABLE)
MAIN CONTROL
OUTPUT
(SSR DRIVE
MODULE INSTALLED)
MODEL TCU
CONTROLLER
MODULE INSTALLED)
(SSR DRIVE
OUTPUT 2 AL2/OP2-A
AL2/OP2-B
AL2/OP2-C
COOLING OPTION
SWITCH
DOUBLE POLE
FUSE
LOAD
-
+
4
3
SSR
POWER
UNIT
1
2
240VAC
SHIELD
INDIVIDUAL RELAY CONNECTIONS
CONNECTIONS
Separate power feed lines should be run to the load side of the relay. The
controller unit and the load should NEVER share the same power feed. It is
recommended to install the SSR Power Unit as close to the load as possible to
keep the power cable runs short. This will help reduce noise from radiating
into other equipment. The input control signal cable can be run over distances
in excess of 200 ft. with shielded cable from the controller to the SSR power
unit. Connect the shield to the minus “-” terminal of the control signal, on the
SSR Power Unit and at only one end.
OPERATION
The following are important aspects of operation of the SSR power unit
which must be considered. Adhering to these guidelines will ensure reliable and
trouble free operation.
THERMAL RATING CURVES
The Thermal Rating Curve will determine the maximum allowable ambient
operating temperature for the maximum continuous load current. The two
parameters must intersect in the Safe Operating Area of the graph. Operation
outside the safe operating area will shorten the life of or cause permanent
damage to the SSR Power Unit.
The ambient temperature of the
power unit should be measured
with all of the associated
equipment operating to verify
the Thermal Ratings.
Ratio
Surge Current to
Steady State Current
5
7
10
Compressors 10
Motors (motionless)
Load Device
Incandescent Bulbs (cold)
Quartz Heaters (cold)
400
300
150
0.01 0.02 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10
SURGE DURATION (Seconds)
PEAK SURGE CURRENT vs. DURATION
SAFE OPERATING AREA
PEAK
SURGE
CURRENT
(AMPERES RMS)
50
40
30
20
10
0
0 12.5 25 37.5 50 62.5 75 O O O O O O
THERMAL RATING CURVE
AMBIENT TEMPERATURE (°C)
SAFE OPERATING AREA
O
MAXIMUM
CONTINUOUS
LOAD
CURRENT
(AMPERES RMS)
CONTROLLER
MODEL TCU
MODULE INSTALLED)
(SSR DRIVE
OUTPUT
MAIN CONTROL
SWITCH SELECTABLE)
(115/230VAC
AC POWER
SWITCH
DOUBLE POLE
FUSE
LOAD
6
5
4
3
2
1
OP1-A
OP1-B
OP1-C
-
+
4
3
SSR
POWER
UNIT
1
2
MULTIPLE RELAY CONNECTION
L1
N
N
L2
2
1
UNIT
POWER
SSR
3
4
+
-
LOAD
FUSE
DOUBLE POLE
SWITCH
SWITCH
DOUBLE POLE
FUSE
LOAD
-
+
4
3
SSR
POWER
UNIT
1
2
L3
N
MULTIPLE UNITS
For increased power handling, up to four SSR Power Units may be parallel
connected, and all controlled by a single output of an SSR Drive Module
(OMD00003). The output of the SSR Power Units must NOT be parallel
connected to the same load because of unequal current sharing among the
devices. The outputs should be wired to individual heaters, but they may share
the same supply. If five or more SSR Power Units are required, a Relay Output
Module (OMD00000) may be used in conjunction with an external +12 VDC
power source (RLC Model APS01000) to switch the SSR Power Units.