The TDID transformer speed controllers are based on the principle of voltage control with auto-transformers. They are applicable to three phase voltage-controllable motors (400 VAC, 50/60 Hz), to control the rotational speed of fans in five steps.
They are fitted out with contacts for motors equipped with thermostat (Tk) overheat protection.
A safety isolator/switch disconnector should be installed on the mains side of all motor drives; refer to SISO.
• Independent 5 step transformer drive with motor overheat protection via thermostats
via motor thermostats (Tk) • Switch: 5 positions with off-
position
• Indicator light
UL94-V0, RAL 7035) / sheet steel
(RAL 7035)
• Maximum ambient temperature:
50 °C