Features
Two LEDs indicate the
energized load.
Can be ordered with a
switch to manually
override the system.
Model ALT
Alternating Relay
•
Engineered
Protection
Three choices of input
voltage provide the
versatility needed to
handle global applications.
Can be ordered with a
standard SPDT relay or
with cross connected
relays.
Debounce time delay
prevents nuisance tripping
caused by float switches.
Compact design saves
precious panel space.
Model ALT alternating relays are used to alternate between two loads.
The ALT is commonly used in duplex pumping applications to balance the
runtime of both pumps.
Features:
•Alternates between
two loads
•Solid-state reliability
•Compact size
•Debounce time delay
•SPDT or cross connected
•Optional manual/auto
mode switch
The Model ALT-S is used in single high level float applications. When the
float switch opens, the alternating relay changes state forcing the other
pump to run the next time the float closes.
The Model ALT-X has an internal cross-connected relay and is used in
applications where two high level floats are used. These floats are
commonly referred to as lead and lag floats. The lead float causes the relay
to change state each time it opens (identical to the float in the ALT-S
application). The cross-connected relay configuration allows one pump to run
anytime the lag switch is closed. This system configuration is used when
there is a chance that the tank inflow exceeds the pumping capacity of
either pump alone. When both the lead and lag floats are closed, both
pumps will run.
These relays are also available with a built-in switch that is used to
manually force one pump to run every time the float switch is closed. This
is helpful when one pump has been removed for repair or for test purposes.
All Model ALT relays have a built-in debounce feature that prevents the relay
from changing state if the switch or float contact bounces momentarily.
2880 North Plaza Drive • Rapid City, SD 57702
(800) 843-8848 • (605) 348-5580 • FAX (605) 348-5685
www.symcominc.com • email: sales@symcominc.com
6/04
Model ALT
ALTERNATING
RELAY
Alternating Relay
LOAD 2
LOAD 1
SymCom Inc.
Rapid City, SD
7
Specifications
•
Operating Points
•
Special Options
8
6
LOAD 2
1
7 6
8
5
1 2 34
PILOT
DEVICE
5
SUPPLY
1.75"
(44.545)
4
LOAD 1
2
L1 L2
3
OT08 Socket Wiring
2.375"
(60.331)
Specifications
Supply Voltage
•24 VAC or 24 VDC ......................20 - 26 VAC or VDC
•115 VAC ......................................95 - 125 VAC
•230 VAC ......................................195 - 250 VAC
ALTERNATING
RELAY
MODEL ALT
Pilot Duty
Contact Rating
480 VA @ 240 VAC
2 3
1
4
87 65
Supply Current ..........................40 mA
M
M
PUMP
#1
PUMP
#2
3.15"
(80.010)
SUPPLY
PILOT
DEVICE
115 VAC
P/N-ALT115-S
Control Input Impedance (min)
•24 ................................................10 kΩ
•115 ..............................................56 kΩ
•230 ..............................................100 kΩ
.5"
(12.7000)
Contact Rating ..........................480 VA @ 240 VAC
Debounce Time Delay ................0.5 seconds
Ordering Information
Voltage
ALT
-
24
115
230
Options
Connection
S
X
ALTERNATING RELAY
S1
F1
L1
SW
2
3
1
4
8
5
F2
S2
7
L2
6
F1 - F2:
1-2A TYPICAL SIZE
FOR CONTACTOR COILS
S - Standard SPDT Relay • X - Cross Connected Relays
SW - Manual or automatic operation
F3
L1
PUMP
#1
F4
SymCom warrants its microcontroller based products against defects in material or workmanship for a period of
five (5) years from the date of manufacture. All other products manufactured by SymCom shall be warranted
against defects in material and workmanship for a period of two (2) years from the date of manufacture.
For complete information on warranty, liability, terms, returns, and cancellations, please refer to the SymCom
Terms and Conditions of Sale document.
L2
F3 - F6:
MAGNETIC CONTACTORS
SIZE FOR INDIVIDUAL
PUMP APPLICATION
F5
L1
PUMP
#2
F6
2880 North Plaza Drive • Rapid City, SD 57702
(800) 843-8848 • (605) 348-5580 • FAX (605) 348-5685
www.symcominc.com • email: sales@symcominc.com
L2
6/04