Nor-Cal SDC15 Controller - Manual (Page 45)

4-7
■ Connection with solid state relay (SSR)
To drive the SSR, a model having voltage pulse outputs (V0, VC or VV) must be
used.
Generally, the SSR is classified into two groups, constant current type and resistor
type.
● Constant current type
The two conditions listed below must be satisfied.
• Input current (maximum): Check that the input current is within the maximum
allowable current or less, then the parallel connection
can be made.
• Operating voltage range (input): Check that the voltage between the
terminals of the voltage pulse output is
within the specified range.
1. Yamatake's PGM10N/PGM10F series
This example shows the calculation for the connection of the SDC15 and the
PGM10N015.
(Note: For connection with other model number, check the specifications of each
model.)
• Input current:
Since the input current is 10mA or less, up to
two units (10mA X 2 = 20mA < 24mA
[maximum allowable current]) can be
connected in parallel.
• Operating voltage range (input): The rating voltage is 3.5 to 30Vdc. Therefore,
the voltage between the terminals is within the
range.
Voltage between terminals (two PGM10N units)
= Open voltage - internal resistance X total drive current
= 19Vdc ±15% - 82Ω ±0.5%
X 20mA
15 to 20V
Connection diagram
Number of connectable units
(Note) 2 units for each output
=
Chapter 4. WIRING
This unit
+
–
+
–
PGM10N/PGM10F
+
–
PGM10N/PGM10F
SSR to be used Connection V0/VC model VV model
Yamatake PGM10N Parallel connection Up to 2 units Up to 4 units (Note)
Yamatake PGM10F Parallel connection Up to 2 units Up to 4 units (Note)