Phase Technologies SD Series User manual

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Transducer Troubleshooting Guide
Installation Guidelines
1. Do not route the transducer wire in the same conduit or parallel to the motor leads
2. Cut the transducer wire to length. We do not recommend splicing transducer wire. If a wire must be
spliced the additional wire should be shielded and the splice should be a soldered connection. DO NOT
USE WIRE NUTS
3. Do not roll or coil the transducer wire
4. Transducer wire must cross the motor leads at 90 degrees if they must cross
5. Use a 3”non-metallic “T” fitting to prevent noise from coupling to the transducer wire
Identifying Transducer Noise
1. Check the 4-20 mA input under Read Measured Values for unstable reading. Press Enter navigate to
Read Measured Values press enter and navigate to “4-20 ma I1 Input”
2. Does pressure change immediately when the VFD starts?
3. Is the drive acting erratically or displaying “Restart 3-2-1”without a fault being displayed? This indicates
the transducer is seeing an overpressure event. (Note: Check “Overpressure PSI”under Constant
Pressure Parameters if it is set too low it can also cause this problem)
4
5
1
3
2

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Intuitively Engineered
222 Disk Drive
Rapid City, SD 57701
605-343-7934 - Main
866-290-7934 –Toll Free
605-343-7943 - Fax
4. Is the drive not going to sleep after it appears to be maintaining pressure below “Shutoff Frequency”
(Note: this could be a systemic issue if the drive cannot maintain pressure below Shutoff Frequency and
Shutoff Frequency may need to be increased)
Troubleshooting Transducer Noise
1. Check routing and Installation guidelines above.
2. Try disconnecting the bare shield wire from the ground terminal if it is connected.
3. Disconnect the shield wire from COM
4. On SD/2XD/DX series verify the jumper from COM to Ground is present. If not add the jumper. (Note:
This WILL NOT work for active front end LH series drives)
Troubleshooting “SENSOR CONNECTION FAIL”Fault
1. This fault occurs when the 4-20 mA circuit is reading 0 mA.
2. Check to ensure the correct transducer terminals are being used.
3. Check the connection between the drive and the transducer
4. Check any possible splices in the transducer wire. (Note: We do not recommend splicing transducer
wire. If a wire must be spliced the additional wire should be shielded and the splice should be a soldered
connection. DO NOT USE WIRE NUTS)
5. Remove the transducer leads and check for 15 VDC between the I1 terminals. If no voltage is present
check I2 and switch to the I2 analog input. “Analog Select” under Interface parameters must be changed
to “1 Analog 2 Select”
6. On SD/2XD series drives check to see if common mode noise capacitors are installed from BUS+ and
BUS- to ground. If not, create an order for SVK6000 and use DOC023 for installation. See below.

www.phasetechnologies.com
Intuitively Engineered
222 Disk Drive
Rapid City, SD 57701
605-343-7934 - Main
866-290-7934 –Toll Free
605-343-7943 - Fax

www.phasetechnologies.com
Intuitively Engineered
222 Disk Drive
Rapid City, SD 57701
605-343-7934 - Main
866-290-7934 –Toll Free
605-343-7943 - Fax

www.phasetechnologies.com
Intuitively Engineered
222 Disk Drive
Rapid City, SD 57701
605-343-7934 - Main
866-290-7934 –Toll Free
605-343-7943 - Fax
7. Add snubber capacitor from I1+ to COM. If this does not work add a second snubber cap between I1+
and I1-.
8. Check to see if an Ashcroft low noise transducer is being used. If not replace with new S00150 low noise
transducer.
Troubleshooting “15V DC OVERLOAD”Fault
1. This fault indicates a short on the transducer circuit
2. Reverse the transducer leads/Verify correct polarity
3. Try switching to the I2 analog input. “Analog Select”under Interface parameters must be changed to “1
Analog 2 Select.”(Note: It is not likely this will help actual transducer noise but if I1 is damaged this may
correct)