Inovance MD500T75G - Page 55

MD500 User Manual 3. Electrical Installation
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Wiring of DI5 (High-speed Pulse Input)
As high speed pulse input terminal, the DI5 allows maximum frequency input of 100 kHz.
COM
Pulse out
p
ut device
MD500
+24V
OP
DI5
2.4k
Ƶ
DO Wiring
When the digital output terminal must drive the relay, it is necessary to install an absorption diode across the relay coil. This
diode prevents inductive switching transients causing damage to the DC 24V power supply. The absorption diode must have a
forward current rating of 50 mA.
DO
CME
COM
Relay Diode
MD500
+24V
When the FM terminal is used for FMP continuous pulse output, it allows the maximum frequency output of 100 kHz.
Note
ƕ Be careful to install the absorption diode with the correct polarity, to prevent
damage to the 24 VDC power supply when there is a digital output.
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Relay Terminal Wiring
To smooth peak voltage that results from cutting off power to inductive load (relay, contactor and motor), use a voltage
dependent resistor (VDR) at the relay contact and add absorbing circuit to the inductive load, such as VDR, RC absorbing
circuit or diode.
220 VAC
220 VAC
24 VDC
TA
TB
TC
TA
TB
TC
TA
TB
TC
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