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4/07 UDC2500 Universal Digital Controller Product Manual 25
If the load current is less than the minimum rated value of 20 mA, then there may be residual voltage across both
ends of the load even if the relay is turned off. Use a dummy resistor as shown to counteract this. The total
current through the resistor and the the load must exceed 20 mA. Solid State Relays are zero-crossing type.
2
1
Solid State relays are rated at 1 Amp at 25°C and derated linearly to 0.5 Amp at 55°C. Customer should size
fuse accordingly. Use Fast Blo fuses only.
Dummy Resistor
2
A
larm
Relay#1
Output
Relay#1
L1
L2/N
4
5
7
8
9
N.O.
N.C.
N.O.
Relay Load
Load
Supply
Power
Time Simplex
19
20
21
22
23
24
25
26
27
Time Duplex
A
larm
Relay#2
N.C.
N.O.
6
A
larm
Relay#1
Output
Relay#1
L1
L2/N
4
5
7
8
9
N.O.
N.C.
N.O.
19
20
21
22
23
24
25
26
27
2
Output
Relay#2
N.O.
6
Relay Load
To terminal
7 or 9
Relay Load
Load
Supply
Power
2
3
Load
Supply
Power
Load
Supply
Power
Dummy Resistor
Dummy Resistor
1
Relay Load
Electromechanical relays are rated at 5 Amps @ 120 Vac or 240 Vac or 30 Vdc.
Customer should size fuses accordingly. Use Fast Blo fuses only.
3
1
1
To terminal
4 or 6
Relay Load
To terminal
7 or 9
Relay Load
3
3
Load
Supply
Power
Load
Supply
Power
Figure 2-9 Solid State Relay Output
See Table 2-6 for relay terminal connections for other Output Algorithm Types.