Azbil SDC36 - Page 56

4-10
Chapter 4. WIRING

Resistor type (Azbil Corporation's PGM_ _2A1, etc.)
When necessary, an appropriate external resistor is connected in series so that the
voltage between the input terminals of the SSR you are using is within the specified
range.
(Example) Connection of two Azbil Corporation PGM units
Connection diagram
This unit
V
R0
PGM_ _2A1
R2 Vf
3 4
PGM_ _2A1
R2 Vf
3 4
External resistor R1
+
-
V: 19 V ± 15 %
R0: 82 Ω ± 0.5 %
R1: 680 Ω
R2: 260 Ω
Vf: 1.1 V
Voltage between terminals of PGM = (V - 2 × Vf) / (R0 + R1+ R2 + R2) × R2 + Vf
=
4.5 V
Input voltage range of PGM: Since the input voltage range is 3 to 6 V, the
operation is possible.
External resistors
SSR to be
used
Number of units
to be connected
Connection External
resistor
Notes
PGM_ _2A1 1 – 1 k (series connection) Rating is 1/2W or more.
2 Series connection 680  (series connection) Rating is 1/2W or more.
3 Series connection 330  (series connection) Rating is 1/2W or more.
4 Series connection None
Number of connectable units
SSR to be used Connection V0 model VV model
PGM_ _2A1 Series connection Up to 4 units Up to 8 units (Note)
(Note) 4 units for each output