36V 19A Controller suit Dragon GTS and GTR non-V2, earlier 36V models [JP]

3rd image shows the typical wiring (connectors and colours for A+B set on dual motor).

• JP (Jinpin) Controller suits the earlier 36V models such Dragon GTS and GTR (non-V2).
• Makes/models using this system are easily identified by having a JP throttle/display.
• 36 volts (V), 19 amps (A) current = 684 watts (w) or 798w at full charge (42V).
• Low voltage cut-off at 29V.
• Square Wave (no hall sensor wires).
• Each controller is 90mm x 52mm x 30mm which may be slightly slimmer and longer than the earlier versions.
• Supplied as JP Factory spare, the OEM controller manufacturer adopted on these specific Dragon makes/models.
• Typically required as replacement when display presents controller failure error (cube/box on display) or motor runs rough (like combustion engine missing a cylinder).

Notes:

1. Refer to the 48V 25A suit Dragon GTR V2, GTS V2, 48V GTR & Dragon Cyclone (Non-Pro) [JP] page for further information about the various JP controllers across Dragon models, including the newer 48V GTS and GTR models.
2. The low voltage cut-off defines the voltage at which the controller will "cut off" and no longer draw any power from the battery pack to prevent excessive discharge. The value is represented on the controller nameplate. As mentioned, the product is factory configured to 37 volts, this is fixed and cannot be user-defined. If voltage drops to this level, the controller will turn off (shut down). This will typically occur under heavy throttle at low battery level (watch the voltage reading on the display when riding). It is one of the several methods of low voltage protection. Battery Management System (BMS) low voltage protection, which is a secondary protection, works in similar manner though self-resettable fuse in the BMS kicks in to power off the scooter, the scooter cannot be powered on until charger is connected. The BMS Low Voltage Cut-Off is typically marked on the battery pack nameplate. The third mechanism to protect from undervoltage is the P setting (throttle/display user manual), P1: "Undervoltage", this value can be user-set in 0.5v increments. The P1 setting provides a "graceful" implementation by reducing throttle (effectively mode/gear 1, or a "limp" mode) when the threshold is reached to protect excessive low voltage on the battery chemistry. For 36V (see the reference graph) systems with high endurance cells, eSN recommends this be set to 32 volts as the 29V current limit on the controller is pretty low. You can watch your voltage drop when throttling heavy on low battery.
   
   Undervoltage handled is undertaken by the controller (progressive "limp modes") in accordance with the following table for 36V.
   
   
3. Other regional stockists (online) include Bike Scooter City Sumner Park (Brisbane) and eOzzie Melbourne.
4. Note specific to Dragon GTR V2, GTS V2: This item is suitable. This includes all the dual-motor models. No specific sourcing notes apply to these models.
5. Notes specific to Dragon GTS and GTR (single motor, the non-V2):
   
   These models transitioned from 36 volt to 48 volt system sometime around late 2021/early 2022.
   For 36V models
   This item is suitable for either of the 36V versions of GTS and GTR. It is a replacement for the BSC have listed: POWER CONTROLLER FOR DRAGON GTR AND GTS 36V (SINGLE MOTOR), which e-Ozzie list as separate products for GTS and GTR, with the later offered in two variants (2021 Older Version and 2022 New Version, assuming this is 36V vs 48V). The product images suggests the 36V controller is current limited to 21 amps, which is 756 watts (derived from 36V x 21A). At full charge (42 volts) this would deliver 882 watts. The 19A may be a better, more conservative option on demand as the chemistry in the battery cells of these older models are nearing EOL and has negligible difference in power/torque.
6. Evolution of controller and connectors

Jinpin make incremental revisions to these controllers. For example, the earlier controllers were of different size (larger/fatter) enclosure. You will observe some variations with the wiring and number of connectors, often these have been "bolted on" for additional functionality, such as security devices and other switching instrumentation. Typically the newer revisions are "backward compatible" with previous versions. The first product image shown reflects precisely the stock on hand and that is what you will be working with. The wiring can generally be determined easily from colours and some logical thinking, with some help of the additional photos and diagrams on this product page. It is good practice to sticking the connectors down with Blue Tac adhesive and taking a photograph of the connectors, polarity/orientation and wire colours. Many of the colour conventions adopted are universal, such as the wire colours adopted on Kaabo makes.