Operation
ZF2/ZF3 SCR Power Controller
12
Ametek HDR Power Systems
Rev 3
a. Set the
ZERO
and
SPAN
controls fully CCW (counterclockwise).
b. Connect a voltmeter across terminals X1 and X3 of the ZF2/ZF3. Set the voltmeter range to
measure full input voltage.
c. Close the fused disconnect or circuit breaker to apply power to the ZF2/ZF3. Turn the Process
controller on and set to demand zero power output.
Figure 4.2 Process Controller Input Connections
d. Adjust the
ZERO
control CW until the output just turns on, then turn the
ZERO
control CCW just to
the point where the output voltage reading is zero.
e. Set the Process controller to demand 100% output. Observing the voltmeter, adjust
SPAN
CW
just to the point where the reading is below the maximum output voltage. Then adjust
SPAN
CW
just to the point where the meter reading is at maximum.
Note: The output voltage measurement on Zero Fired Power Controllers with a digital voltmeter
will be erratic except at full output. This is due to the variable pulses to regulate the output.
f. Repeat steps 4.3d and 4.3e as necessary, to ensure proper control adjustments have been made.
g. Turn off the line power to the ZF2/ZF3 and disconnect the test equipment. The ZF2/ZF3 is now
ready for automatic operation.
4.4
Remote Manual Control with a Potentiometer
Some applications only require a manual control input and not a closed loop input from a process
controller. This potentiometer may be located on a remote panel near other controls related to the
process being powered by the ZF2/ZF3. It may be calibrated to correspond to a percentage of rated
power output, process temperature, or some other parameter. The potentiometer may by 500 Ω to 5
kΩ, and should be rated at 1/2 watt, minimum.
a. With the power to the ZF2/ZF3 turned off, connect the potentiometer as shown in Figure 4.3. The
CW position is the full power output position. Terminal TB1-5 is internally connected to a positive
dc voltage source.
b. Connect a voltmeter across terminals X1 and X3 of the ZF2/ZF3. Set the voltmeter range to
measure the full output voltage.
c. Set the
SPAN
control and remote potentiometer fully CCW.
d. Close the fused disconnect or circuit breaker to apply power to the ZF2/ZF3. The unit should be
energized, with no output.
WARNING - ELECTRIC SHOCK CAN KILL
HAZARDOUS VOLTAGES
exist at the
output terminals and at the load when
the input voltage is connected. This condition exists even when the Controller is
set to deliver zero output. Always remove power and properly lock out power to
the unit before attempting any service, including the load.
Summary of Contents for ZF2 SCR Series
Page 6: ...Table of Contents ZF2 ZF3 SCR Power Controller iv Ametek HDR Power Systems Rev 3...
Page 8: ...Safety Instructions ZF2 ZF3 SCR Power Controller 2 Ametek HDR Power Systems Rev 3...
Page 24: ...Operation ZF2 ZF3 SCR Power Controller 18 Ametek HDR Power Systems Rev 3...
Page 32: ...Troubleshooting ZF2 ZF3 SCR Power Controller 26 Ametek HDR Power Systems Rev 3...
Page 51: ...Notes...
Page 52: ...503 Lakeview Plaza Blvd Ste C Worthington Ohio 43085 USA...
