User manual

ENABLE INPUTS
The enable inputs may be driven through relay contacts, NPN transistors or sensors,
etc. The signals must be low ( pulled to ground ) to enable. The positive and negative
enable signals can be used for selective enabling, for example in a linear system to cut
off the drive at end-of-travel limits. For shutting off the entire amplifier, for example
from a control system, use the Enable input.
NORMAL / FAULT OUTPUT
The Normal / Fault output polarity can be selected by DIP switch S8 as described
earlier. It can be used to drive opto-couplers, lamps, relays etc. While driving relays,
remember to install a fly-back diode in reverse across the relay coil to protect the
Normal / Fault output MOSFET.
RESET INPUT
This signal can be grounded momentarily to reset a fault condition. DO NOT ground
this input continuously. If a fault condition occurs and persists, it could cause
overheating of the output stage of the amplifier.
NORMAL / FAULT LED
The LED is Red, indicating a fault, under any of the following conditions :
Supply voltage outside normal limits ( 22 to 155 volts ).
Heatsink temperature is above 83 degrees C.
A short circuit exists between outputs, or between outputs and ground.
If none of the error conditions described above has occurred, the LED will be Green if
the Enable input is low ( true ), or off if the Enable is high ( false ).
The short circuit and over temperature errors are latched, and can be cleared by
cycling power off and on, or by pulsing the reset input low.
+/- 12 V SUPPLY OUTPUTS
These auxiliary supply outputs can supply a maximum current of 10 mA. If they are
accidentally short circuited, power will have to be cycled off and then on again to
restore normal operating conditions.