Tait T809-10, Service Manual

Page: 27 / 42

MBZ-00001-01
Installation Guidelines 27
Copyright © 2004 Tait Electronics Ltd November 2004
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Figure 3.4 Output voltage remote sense with shielded twisted pair
Note:
Ensure that the remote sense connections are made with the correct polarity
before the mains supply is connected (that is, positive to positive and
negative to negative).
Failure to connect the remote sense on the power supply side of any protection device
or switch, will cause the power supply to shut down when the protection device or
switch opens the circuit. This happens because the power supply senses 0 volts across
the remote sense terminals, and the output voltage then increases to compensate for the
apparent reduction.
If this occurs, the power supply can be reset by switching OFF the mains supply, discon-
necting the load, and disconnecting the remote sense wires. Wait 30 seconds before
switching the power supply ON again.
Warning: The heavy gauge wire connection between the power supply and the pro-
tection device and switch (if used) must be rated to carry the fault current of
the power supply – refer to Section 3.2 (Wiring and Protection Devices).
Remote
sense
+
–
V
DC
V Out
Heavy gauge wire
Light gauge wire
Load
(e.g. transmitter) Shield
Power supply
+S
–S
+V
–V
Switch
Protection
device