Watlow F4T - Page 26

Watlow F4T Install & Troubleshooting • 23 • Chapter 2 Install and Wire
Output Connections (cont.)
relays. As an open collector output, use an external power supply with the negative wired
to B1, the positive to the coil of a pilot mechanical relay and the other side of the coil
wired to D_. Each open collector output can sink 1.5 A with the total for all open collector
outputs not exceeding 8 amperes. Ensure that a kickback diode is reverse wired across the
relay coil to prevent damage to the internal transistor.
Digital Output - Open Collector Wiring Example
5Vdc
Open Collector Outputs
Internal Circuitry
Power Supply
5 to 32 V(dc)
Relay
+
-
Common
Diode
Fuse
An example fuse is
Bussmann AGC-1 1/2
B1
D6
D5
D4
D3
D2
D1
Z1
User Selectable
Voltage
24Vdc
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