Vmax-VFD Operational Instructions
Some systems are equipped with a Variable Frequency Drive (VFD) with an Operator Interface Module
(OIM) remote keypad.
Following are brief general instructions and charts. Please refer to Vmax-VFD system-specific
operation instructions included with each Vmax-VFD system.
On systems with a VFD, remember to open the seal fluid valve located under the separator tank before
startup. Upon power up of the system, the VFD will go thru an initial self-check, and the remote OIM will
display the main menu.
There are two custom windows that will display on the OIM (Operator Interface Module) screen by pressing
the ESC/PROG button on the keypad. The first screen shows three items, the first item is total run hours
that the motor has run, second is Torr set point (vacuum level set point) and finally Torr feed back (vacuum
level pump is at) (Torr (mmHg) = 760 – (“HgV x 25.4). When you press F3 again, the second screen shows
HP (horse power), AMPS, and Hz (Hertz). Pressing F3 again will bring you back to the first display screen.
The High Temperature light will be on. You must push the Alarm Condition Reset button before you can
place the system in the required mode of operation.
In Manual Mode, the system will run at a constant RPM. In Auto Mode, the system will monitor a set point
that the operator sets. The vacuum set point for the system is achieved by using the Operator Interface
Module (OIM) on the front door of the control panel (some models may have the OIM inside the front door
of the panel). Using the up and down arrows on the keypad, a window will pop up displaying the (% OIM
Ref). By pressing the up or down arrow key, the % value will increase or decrease to the required
percentage of the transducer output signal (preset to 26.33% = 22” HgV).
The VFD chart on the next page gives you the % VFD value that is associated with the transducer voltage
which then correlates to a vacuum level. The VFD will maintain the vacuum level at the set point by
increasing or decreasing the RPM of the motor. To verify whether the VFD is in Auto or Manual mode, look
in the upper right-hand corner of the screen. If it is in Manual mode it will display Man, and if it is in Auto
mode it will display Auto. To change the desired mode, press the F1 button in the main menu screen.
All system wiring is performed at the factory. Check area classification to ensure all electrical enclosures
comply to code. Required customer wiring is minimal, but should be done by a qualified electrician in
compliance with OSHA, National Electric Code and any other applicable local electrical code concerning
switches, fused disconnects, etc. DEKKER includes a wiring diagram in the control panel for use by the
installer. DEKKER recommends that a main disconnect switch be fitted between the vacuum system and
the incoming power.
Wire Size Chart (AWG) by Vmax-VFD Horsepower
Recommended Wire Size and Disconnect Size for Vmax-VFD Systems
Vmax-VFD
System
Serv.
Full Load Amperage at
Volt.
Copper AWG (kcmil)
Recommended
Conduit Size in Inches
Recommended
Disconnect (Amps)
Recommended Class
J Fuse (Amps)
Model No.
HP
Fact.
230V
460V
Tol.
230V
460V
230V
460V
230V
460V
230V
460V
VMX-VFD0063KA1
5 1.0 12.0
6.0 ±10% 12
16
20 15 15 10
VMX-VFD0083KA1
5 1.0 12.0
6.0 ±10% 12
16
20
15
15
10
VMX-VFD0103KA1
7.5 1.0 19.0
9.5 ±10% 10
14
30
20
25
15
VMX-VFD0153KA1
10 1.0 24.0
12.0 ±10% 10
12
½”
35 25 30 20
VMX-VFD0203KA1
15 1.0 39.0
19.5 ±10% 8
10
¾”
60 30 50 25
VMX-VFD0303KA1
20 1.0 50.8
25.4 ±10% 6
10
60
35
60
30
VMX-VFD0453KA1
25 1.0 62.0
31.0 ±10% 4
8
1”
80 40 70 35
VMX-VFD0553KA1
40 1.0 99.0
49.5 ±10% 1
6
125
70
125 60
VMX-VFD0753KA1
50 1.0 123.0
61.9 ±10% 1/0
4
1-1/4”
150 80 150
70
VMX-VFD1003KA1
60 1.0 146.8
73.4 ±10% 2/0
4
1”
200 100 175 90
VMX-VFD1103KA1
75 1.0 174.0
87.0 ±10% 3/0
2
2”
200 100 200 100
VMX-VFD1203KA1
100 1.0 232.0
116.0 ±10% 250
1
2-1/2”
1-1/4”
250 150 250 125
NOTES: 1. Based on no more than three single insulated conductors rated 0-2000 volts.
2. Conduit sizes shown does include ground conductor if required (over 60 amperes).
3. Wire sizes are based on THHN 75 deg. C rated conductors.
4. Approved trade size conduit or metal tubing.
5. Use the disconnect and fuse corresponding to the 230V or 460V range
6. Above information is general information. Please confirm actual motor full load amperage before proceeding.
Dekker Vacuum Technologies, Inc. – Vmax/13
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