7 … 9
6 … 9
MC • Karl Dungs
, Inc.
• EMP-5 • Edition 2017.05 • P/N 261483
Side Box Test #1:
Connect the drive’s leads to the cor-
responding lead of a suitable current signal source (current
calibrator). Apply power to the actuator, then turn on the
current signal source (current calibrator). Adjust the current
signal source (current calibrator) until the mA meter reading
equals the desired zero point current (2 to 16 mA). Adjust
the current signal source (current calibrator) until the mA
meter reading equals the finish point current. With the de
-
sired finish point current applied, the actuator shaft should
drive to the finish point. If the actuator fails this test, repeat
the CP-9302-702 adjustment on page 4. Short the Violet/
White wire to the Violet wire; the actuator shaft should turn
counterclockwise. Short the Violet/White wire to the Bluewire;
the actuator shaft should turn clockwise. When you break the
connection between the Violet/White and Violet wires, the
shaft should return fully clockwise. If the side box fails this
test, perform Test 2.
Actuator Test #2:
If the side box test passes, then the actua-
tor can be tested. Disconnect the wires at terminals X, 2 and
3. Jumper actuator terminal “X” to terminal 2; the actuator
shaft should turn clockwise (CCW for reverese configuration).
When the connection between terminals “X” and 2 is broken,
the shaft should remain stationary. Then jumper terminal “X”
to terminal 3; the shaft should turn counterclockwise (CW for
reverese configuration).
Conclusion:
1) If the side box test #1 fails but the actuator test #2 passes,
then the side box is defective.
2) If the actuator test #2 fails, then the actuator is defective.
3) If both tests fail, then the actuator is defective. The side
box must be tested on a functional actuator in order to
determine whether or not it is defective.
Tech Tip #1: There is no rectified circuit in the actuator’s
shading windings. The voltage on the shading windings
is about 30 VAC, and the voltage on the main windings is
120 VAC.
Tech Tip #2:
Maximum voltage to terminals 7 and 8 is
24 VAC. During operation, the voltage at these terminals is
about 12 VAC.
Tech Tip #3:
For 0 - 10 VDC input control, the resistance
and - leads is 10,000 ohms.
Tech Tip #4:
For 4 - 20 mA input control, the resistance
and - leads is 250 ohms.
Tech Tip #5:
For 4 - 20 mA input control, the input control
voltage on the + and - leads should be 1.0 VDC at 4 mA, 2.5
VDC at 12 mA, and 5 VDC at 20 mA.
Tech Tip #6:
Across terminals 2 to X and 3 to X, the voltage
should be 24 - 30 VAC and about 0.9 amps when actuator
is powered.
Tech Tip #7:
The black converter (side box) operates on
24 VDC, and pulls its voltage from the shading windings.
Tech Tip #8:
The EMP has internal impedence protection.
There is no need to electrically protect it with a fuse.
Tech Tip #9:
The amperage draw under locked rotor is the
same.
Tech Tip #10:
The torque is the same at low temperatures,
but the timing might be longer.
Problem
#1:
The actuator will not modulate; it will only remain at 0 deg,
and then at some input the actuator will drive completely
to 90 deg.
#2:
The actuator will not modulate, or modulation will be erratic.
#3:
The actuator will actuate on the opposite direction; with
4 mA in, the actuator goes to high fire, and with 20 mA, it
goes to low fire. Or, when the designated wires for HIGH
fire override are made, it drives to LOW fire.
Possible Solution
#1: This problem can occur if the factory configuration (CCW
rotation for 0 - 90 deg) is switched to REVERSE configura
-
tion (CW rotation for 0 - 90 deg), but only one set, rather
than both sets, of terminals were not changed. Terminals
7 and 8 AND 2 and 3 need to be reversed.
#2:
Verify that the low voltage input wires are not in the same
conduit at the high voltage wires. Check jumper under
side box and adjust pots if needed.
#3:
Verify that the input wires (the - and the +) are not reversed
at the meter, the side box, or at the temperature controller.
Testing
Technical Tips and Data
Troubelshooting