Penny + Giles UCM Assembly instructions

UCM
Installation and set-up guide
DESCRIPTION
Model UCM is a low voltage DC powered Universal Conditioning Module that can accept a wide range of analogue inductive
transducer types and is suitable to drive LVDTs and RVDTs. For the full product specification, refer to the UCM product
brochure.
MOUNTING
• The UCM module is designed to be mounted on a bulkhead close to the transducer, by using 4 x M5 cap head screws, 28mm
long (minimum) through the mounting holes that are located under the housing lid. The recommended screw tightening torque
is 4Nm.
• The user should also ensure that the rubber seal is properly located in the lid groove prior to re-fitting the lid after setup.
Recommended tightening torque for the lid screws is 2Nm.
WIRING NOTES
• The supply, transducer and output connections are routed through two IP68 rated cable glands that can accommodate cable
diameters of between 3 and 8mm. The user should ensure that the cable glands are tightened sufficiently to ensure cables are
clamped and sealed.
• Users should also ensure adequate sealing of the opposite end connections on supply, transducer and output cables to ensure
moisture cannot migrate down the inside of the cables into the UCM.
• Connections are made to screw terminal blocks on the UCM circuit board.
• The enclosure is not connected internally to ground, so it can be
mounted on a chassis carrying a voltage potential other than
0Vdc.
• If in doubt about wiring to ground, consult your systems
engineer.
•It is essential that correct connections are made before
connecting the power supply. Incorrect connections or
power applied to transducer connection terminals may
destroy the UCM on power-up.
• The UCM module has a supply current requirement of <20mA.
CONNECTIONS
• The UCM, with or without option cards fitted, only requires a
single supply voltage connected between SUPPLY GND and
SUPPLY VPOS.
• When the VM (Voltage Module) option card is used, an internal
negative rail generator enables zero and negative output
voltages to be achieved.
• If you have a dual supply available, you can connect -10V to
-30Vdc to SUPPLY VNEG, in which case the internal negative
supply generator on the VM option card will be disabled and
current will be drawn from the external supply. To obtain
outputs of -10Vdc or -7.5Vdc, the external negative supply must
be at least -13.5Vdc.
• With the lid removed, unscrew the cable glands C1 & C2 (Fig.1).
Pass the power supply/output signal cable through gland C1
into ‘SUPPLY’ zone on UCM board. Connect the power supply
and output connections to the terminals on the UCM board, as
indicated below and shown in Fig.1.
INNOVATION IN MOTION
ZERO ADJUST
ZERO
JP3
JP4
JP1
JP2 JP5
JP7
SUPPLY
LVDT
{
}
{
SYNC
JP6
S1+
S1-
P1
P2
S2-
S2+
GND
VPOS
GND
VNEG
GND
OUTPUT
IN
OUT
GAIN
GAIN ADJUST
C2 C1
Fig. 1

SUPPLY VPOS Power supply lead carrying the most POSITIVE potential (e.g. +24Vdc)
SUPPLY GND Power supply lead carrying 0V
SUPPLY VNEG Power supply lead carrying the most NEGATIVE potential (e.g. -15Vdc) where fitted
GND Output 0V (ground)
OUTPUT Output signal
• A power supply cable screen can be connected to GND. This is recommended but optional. Consult your systems engineer if
other options required. Firmly tighten cable gland lock nut C1.
• Pass the transducer cable through gland C2 into ‘LVDT’ zone on UCM board. Connect the transducer to the terminals on the
UCM board, as indicated below (based on transducer type) and shown in Fig.1.
Transducer type 6 wire LVDT 5 wire LVDT 4 wire LVDT 3 wire LVDT (Half-Bridge) Potentiometer
LVDT S1+ Secondary 1 finish Secondary 1 finish Secondary 1 finish Centre tap Wiper
LVDT S1- Secondary 1 start Secondary 1 start Secondary 2 finish Not connected Not connected
LVDT P1 Primary finish Primary finish Primary finish Winding finish Track start
LVDT P2 Primary start Primary start Primary start Winding start Track finish
LVDT S2- Secondary 2 start Not connected LINK to S2+ LINK to S2+ LINK to S2+
LVDT S2+ Secondary 2 finish Secondary 2 finish LINK to S2- LINK to S2- LINK to S2-
LVDT GND LVDT screen LVDT screen LVDT screen LVDT screen Screen
• Firmly tighten cable gland lock nut C2.
EXCITATION VOLTAGE SELECTION
• The UCM module can be configured to provide the transducer with 1 or 3
Vrms primary excitation voltage. Use jumper on header JP5 to select the
required voltage. See Fig.2.
EXCITATION FREQUENCY SELECTION
• The UCM offers three user-selectable excitation frequencies – 2.5kHz, 5kHz or 10kHz. The value chosen should be close to the
specified or recommended operating frequency of the LVDT being used. Use jumper on header JP1 to select the required
frequency. See Fig.3.
For 2.5KHz excitation: For 5KHz excitation: For 10KHz excitation:
LVDT OPERATING MODE
• The UCM can be configured to operate LVDTs in the ratiometric or
differential mode. Use jumper on header JP6 to select the required mode.
See Fig.4.
MONITORING THE OUTPUT
• Connect a DMM as below:
GND Output 0V (ground)
OUTPUT Output signal
• Set DMM range to measure DC voltage.
MULTI-CHANNEL APPLICATIONS (OPTIONAL FEATURE)
• Where several UCM modules are operated in close proximity to each other,
synchronising their excitation oscillators to the same frequency can
prevent heterodyning or beating between units. Up to 50 modules can be
synchronised in one network.
• To synchronise up to 50 UCM modules, ensure one unit is set to master.
Locate jumper on header JP2 and set to MASTER position on master unit
only. Set all other units to the SLAVE position. See Fig.5.
• Connect SYNC OUT of master unit to SYNC IN of all slave units.
RATIO.
DIFF.
RATIO.
DIFF.
Fig. 4
JP6 JP6
Ratiometric mode
10
5
2.5
FREQ. KHZ
1
JP1
10
5
2.5
FREQ. KHZ
1
JP1
10
5
2.5
FREQ. KHZ
1
JP1
Differential mode
Fig. 3
3VRMS
3VRMS
1VRMS
1VRMS
3VRMS
1VRMS
Fig. 2
JP5
JP5
JP2
MASTER
SLAVE
Master position Slave position
MASTER
SLAVE
JP2
Fig. 5

ZERO AND GAIN ADJUSTMENT
• Locate header JP3 on UCM board. This determines the transducer gain settings.
• To establish the LVDT null point, set any jumper on header JP3 to the SET ZERO position, the other jumper may be removed or
placed in the LK2 position of header JP3. See Fig.6.
Fig 6 Fig 7 Fig 8
•Power up the UCM module. Rotate the ZERO trim pot until the output voltage reads the required mid stroke voltage (e.g.
2.500Vdc for a 0.5 to 4.5Vdc output). Remove the jumper on header JP3 from SET ZERO, the jumper can be placed in the LK1
position.
• Adjust LVDT core displacement until output signal reads 2.500Vdc (this is the LVDT null).
• Set the GAIN trim pot fully anticlockwise (this is a 20 turn pot).
• From null position displace the LVDT core to full-scale in the positive direction. Change the COARSE GAIN link settings in the
following order, leaving the links in the position that gives the nearest to (but not exceeding) the required full-scale output
(4.5V if no output option card is fitted on header JP7).
• Put one jumper in the DIV position and the other jumper in the K4 position of header JP3: See Fig.7.
Move the jumper from the K4 position to the K3 position.
Move the jumper from the K3 position to the K2 position.
Move the jumper from the K2 position to the K1 position.
Move both jumpers to the LK1 and LK2 positions: See Fig.8.
• Move one jumper to MULT and the other jumper to the K1 position See Fig.9
Move the jumper from the K1 position to the K2 position.
Move the jumper from the K2 position to the K3 position.
Move the jumper from the K3 position to the K4 position.
• Leaving the links in the position that gives the output nearest to (but not exceeding) the required output (4.5Vdc if no output
option card is fitted on header JP7), turn the GAIN trim pot until the required output is achieved (e.g. 4.500Vdc).
Note 1 Because the GAIN pot provides a small amount of overlap between coarse gain settings, it is sometimes possible to
calibrate an LVDT in either of two coarse gain settings. The above procedure ensures that the highest coarse gain
setting is always selected.
Note 2 If there are slight differences in the positive and negative sensitivity, or the displacements are different, then it may be
appropriate to set the zero to some other voltage within the output voltage range.
FITTING AN OUTPUT OPTION CARD
• Before fitting an option card, ensure that the ZERO AND GAIN ADJUSTMENT procedure has been completed, then power
down the UCM.
• Locate header JP7 on UCM board. (See Fig.1.)
Remove jumper from header JP7 (LK3).and place on header JP4 (See Fig.1.)
A choice of three output option cards is available:
VM – Voltage Module card to provide an extended range of voltage outputs.
CM – Current Module card to provide 4-20mA output.
PWM - Pulse Width Modulation card to provide a TTL level signal with 10-90% duty cycle.
Insert the selected option card on to header JP7 and follow the procedure for setting up each module card – see below.
• If the option card is no longer required, remove it and replace the jumper on header JP4 (LK4) to header JP7 (LK3).
SETTING THE VOLTAGE MODULE (VM) CARD
• When the Voltage Module (VM) output option card is selected, locate the DIP switch on VM card. (See Fig.10.) Select the
required output voltage, using the Switch Position Matrix Guide (Fig.11.), and set the DIP switch positions accordingly. Insert
connector of VM card onto the vacant pins of header JP7. Power up the UCM, monitor the voltage output and adjust the zero
and gain trim pots if necessary.
SET ZERO
LK1 LK2
MULT Div K1 K2 K3 K4
SET ZERO
LK1 LK2
MULT DIV K1 K2 K3 K4
SET ZERO
LK1 LK2
MULT Div K1 K2 K3 K4
Coarse
Gain Coarse
Gain
Coarse
Gain
JP3 JP3
JP3
JP3
MULT Div K1 K2 K3 K4
Fig 9
SET ZERO
LK1 LK2

SETTING THE CURRENT MODULE (CM) CARD
• When the UCM is fitted with the current module, the output load (resistive to 0V line) needs to be 20 ohms minimum, 400
ohms maximum for optimum linearity.
• When the Current Module (CM) output option card is selected, there are no user-configurable options on the card. Insert
connector of CM card onto the vacant pins of header JP7. Change DMM (already connected between OUTPUT and GND) range
settings to measure a 4 - 20mA current output. Power up the UCM, monitor the current output and adjust the zero and gain
trim pots if necessary. Check that output is 4 - 20mA over the stroke of the transducer.
SETTING THE PULSE WIDTH MODULATION (PWM) CARD
• When the Pulse Width Modulated (PWM) output option card is selected, locate the DIP switch on the PWM card. (See Fig.12.)
Select the required output frequency using the matrix table printed on the PWM card and set the DIP switch positions
accordingly. Insert connector of PWM card onto the vacant pins of header JP7. Monitor the PWM output with respect to GND
using an oscilloscope. Power up the UCM.
• Check that output has 10-90% duty cycle over the the required displacement of the transducer, adjust zero and gain trim pots
if necessary. (Equivalent to 0.5 to 4.5Vdc output).
Fig 12
FINAL SET-UP
• After configuration of the optional output cards, switch off power to the UCM. Remove DMM or oscilloscope connections.
• Replace cover using screws supplied, and follow instructions for the gasket and screw torque settings (See Mounting section).
• Optional, but recommended. Use an indelible pen to mark the configuration settings you have selected, in the appropriate label
area shown on the UCM housing cover. (SENSOR type; OUTPUT type)
• The transducer and UCM module are now ready for use. Refer to UCM technical data sheet/brochure for full specification,
mounting options and dimensions.
For technical assistance contact your local distributor or Penny+Giles at:
UK Tel:[phone] Email: [email protected]
USA Tel:[phone] Email: [email protected]
Web: www.pennyandgiles.com
Document Reference: UCM Set-Up Guide P203445 issue 1 (09/2008)
Insert
card in this
direction Voltage Module (VM)
output option card
JP7
1
7
82
SW1
14
ON DIP
Switch position matrix guide
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
OUTPUT
-5V to 0V
-2.5V to +2.5V
0V to +5V
-10V to 0V
-5V to +5V
0V to +10V
-7.5V to +7.5V
-10V to +10V
Fig. 10
Fig.11
1 2 3 4
• When using the VM voltage
option card, for selected
output signals of 0-10, ±10
and ±7.5 Vdc the supply
voltage VPOS to the UCM
must be at least +13.5Vdc.
ABHz
OFF OFF 1000
ON OFF 310
OFF ON 130
ON ON 100
S1
ON
7 1
8 5 A B