Hey Joe,
So it is this one?
首页 → HY变频器 → 110 V → 110V 2.2KW HY02D211B
At the moment, I do not know any reason why the value of PD142 should be restricted to 11 Amperes. If the VFD is rated 2.2 kW at 110 V Output that means 20 A.
Or is it a spindle/VFD bundle where the seller has set it this way and locked the settings using PD000=1?
But if set to 11 Amperes, it is okay for your 1,5 kW 110 V spindle, you can use it, don’t you?
PD142 Rated Motor Current Unit: 0.1A Factory Setting: *
It is set according to the rated value of the nameplate of the motor. This parameter can be used to restrict the output current of the inverter to prevent over-current and protect the motor. If the current of the motor has exceeded this value the inverter of AC motor will turn to self-protection.
– Source: Huanyang VFD Manual (PDF) on the “Connecting a Huanyang VFD” page at buildbotics.com
Yes, I know, these no-name chinese spindles (you don’t believe G-Penny is a spindle manufacturer? 
) come without datasheet (although you would also need the voltage / frequency curve (e.g. like shown here) in order not to fall below the minimum speed, which can lead to bearing damage).
The spindle RPM is calculated this way:
SPINDLE_RPM = $VFD_FREQ × 2 × 60 / $SPINDLE_NUMBER_OF_POLES
As most VFDs are able to provide max. 400 Hertz and spindle manufacturers refer to this when they specify the RPM rating, this is mostly
400 Hz × 2 × 60 / 2 poles = 24,000 RPM.
Me no. Others maybe yes.
Cheap chinese VFD manuals say nothing about wire sizes. In the manual for my VFD, the Omron MX2 (User’s Manual) / Hitachi WJ200 (Instruction Manual), it is recommended under “Determining Wire and Fuse Sizes” on page 45 rsp. 12:
Determining Wire and Fuse Sizes
The maximum motor currents in your application determines the recommended wore size. The following table gives the wire size. The “Power Lines” column applies to the inverter input power, output wires to the motor, the earth ground connection, and any other components shown in the “Basic System Description” on page 28.
[…]Power Lines
220 Volts(!) single phase input, CT mode:
[...]
Power (kW) Power (HP) 0.1 kW 1/8 HP 1.3 mm² AWG 16 0.2 kW 1/4 HP 1.3 mm² AWG 16 0.4 kW 1/2 HP 1.3 mm² AWG 16 0.75 kW 1 HP 1.3 mm² AWG 16 1.5 kW 2 HP 3.3 mm² AWG 12 2.2 kW 3 HP 5.3 mm² AWG 10
Note that in the table above there are no entries for 110 Volts since Omron/Hitachi manufactures no VFDs for 110 V. But if your VFD’s input power and your spindle are rated 110 Volts, then there flows the double current in Ampères as would with 220 Volts and you have to increase wire sizes accordingly!
Note:
With a 1.5 kW spindle at 240 V there flows 6.25 A current
With a 1.5 kW spindle at 120 V there flows 12.5 A current
The wire sizes mentioned in the table above seem high. Of course you can use thinner wires, but there are reasons for such recommendations.
The wire size for a known current is not defined absolutely. It is defined by a formula which includes power loss and efficiency loss over the wire length. The cross-section area of a wire is inversely proportional to its resistance which strongly affects power and efficiency loss. However these are dimensions that the operator can choose according to their requirements or guidelines.
Note that for dimensioning the wire size, only the current is relevant, neither the power nor the voltage.
If you ask me whether I really put 5.3 mm² (AWG 10) in my drag chain, I say, presently no. If you ask me which wire size I use, at the moment I own a 2.2 kW 230 V spindle which means 9.5 A current, and for 9-12 A I would take nothing under 2.5 mm² (corresponding to 13 AWG). However a webshop I know, for this spindle sells cable with 1.5 mm² (corresponding to 15 AWG).
Note that there is a nice comparison chart for American Wire Gauge to IEC 60228 wire cross-section area in this file:
- Comparison of SWG (red), AWG (blue) and IEC 60228 (black) wire gauge sizes from 0.03 to 200 mm² to scale on a 1 mm grid – in the SVG file, hover over a size to highlight it
The fourth wire is used as Protective Earth (PE) which is extremely important for safety and MUST be connected between Spindle casing and VFD casing or VFD PE connector which itself must be connected to ground. It has to be at least the same wire size than the other three 3-phase wires. As for the shield of the cable, it is connected to this PE wire at both sides.