When may the brake be released on a power type manlift?

Releasing the brake on a power type manlift is permissible when power is applied to the motor. This is because the power enables the motor to control the movement of the manlift, ensuring that it operates as designed. The brake is typically engaged to stop movement and provide safety when the system is not powered. Once power is applied, the motor takes over the operation, which includes managing the brake system safely.

In contrast to the other scenarios, releasing the brake only makes sense when the system is actively powered. The upper terminal of the manlift, while a potential position where one may start a move or end it, does not inherently mean the machine is controlled or safe without power. Maintenance personnel might have specific protocols for brake release, but those should involve isolation of the lift from power rather than blanket permissions. Emergency situations should also dictate the use of brakes under careful control, rather than a general release that could result in unintended movements. Thus, the safest and correct choice is when power is applied to the motor.